Document:

<PAGE>   1
                                                                     Exhibit 4.1

                  SECOND AMENDMENT, dated as of October 4, 2000 (this
"Amendment"), to the 364-Day Revolving Credit Agreement dated as of June 3,
1999, as amended by the First Amendment thereto, dated as of June 1, 2000 (as
the same may be further amended, supplemented or otherwise modified from time to
time, the "Credit Agreement"), among YORK INTERNATIONAL CORPORATION, a Delaware
corporation (the "Company"), the several banks and other financial institutions
from time to time parties thereto (collectively, the "Banks"; individually a
"Bank") and CANADIAN IMPERIAL BANK OF COMMERCE, acting through its New York
Agency, as administrative agent for the Banks thereunder (in such capacity, the
"Administrative Agent").

                              W I T N E S S E T H :

                  WHEREAS, the Company, the Banks and the Administrative Agent
are parties to the Credit Agreement;

                  WHEREAS, the Company, the Administrative Agent and the Banks
desire to amend the Credit Agreement in the manner provided for herein;

                  NOW THEREFORE, in consideration of the foregoing, the parties
hereto agree as follows:

                  1. Defined Terms. Unless otherwise defined herein, terms which
are defined in the Credit Agreement and used herein as defined terms are so used
as so defined. Unless otherwise indicated, all Section, subsection and Schedule
references are to the Credit Agreement.

                  2. Amendments to Subsection 1.1. (a) Subsection 1.1 of the
Credit Agreement is hereby amended by deleting the definition of "Consolidated
EBIT" contained therein in its entirety and inserting in lieu thereof the
following definition:

                  "Consolidated EBIT": for any period, Consolidated Net Income
         for such period (excluding, however, (a) any gains from the sale or
         other disposition of assets (other than sales of inventory in the
         ordinary course of business), (b) the effect of non-recurring
         restructuring charges in an amount not to exceed $50,000,000 incurred
         prior to December 31, 1999 in connection with the Acquisition and the
         integration of the operations of Sabroe with those of the Company and
         its Subsidiaries, (c) any non-recurring charges incurred prior to July
         1, 2001, in an aggregate amount not to exceed $110,000,000 in
         connection with the profit enhancement initiatives announced in the
         Company's earnings release for the third fiscal quarter of 2000, and
         (d) any other extraordinary or non-recurring gains), before deduction
         for income taxes and Consolidated Interest Expense, determined in
         accordance with GAAP.

<PAGE>   2
                                                                               2

                  (b) Subsection 1.1 of the Credit Agreement is hereby amended
         by deleting the definition of "Consolidated Net Worth" contained
         therein in its entirety and inserting in lieu thereof the following
         definition:

                  "Consolidated Net Worth": at any particular date, all amounts
         which, in accordance with GAAP, would be included under stockholders'
         equity on a consolidated balance sheet of the Company and its
         Subsidiaries at such date, adjusted to exclude therefrom any effects on
         stockholders' equity resulting from any non-recurring charges incurred
         prior to July 1, 2001, in an aggregate amount not to exceed
         $110,000,000 in connection with the profit enhancement initiatives
         announced in the Company's earnings release for the third fiscal
         quarter of 2000.

                  3. Representations and Warranties. On and as of the date
hereof and after giving effect to this Amendment and the transactions
contemplated hereby, the Company hereby confirms, reaffirms and restates the
representations and warranties set forth in Section 4 of the Credit Agreement,
except to the extent that such representations and warranties expressly relate
to a specific earlier date in which case the Company hereby confirms, reaffirms
and restates such representations and warranties as of such earlier date,
provided that the references to the Credit Agreement in such representations and
warranties shall be deemed to refer to the Credit Agreement as in effect prior
to the date hereof and as amended pursuant to this Amendment.

                  4. Effectiveness. This Amendment shall become effective upon
satisfaction of each of the following conditions:

                  (a) receipt by the Administrative Agent of counterparts of
         this Amendment duly executed and delivered by the Company and the
         Required Banks; and

                  (b) the Fourth Amendment, dated as of the date hereof, to that
         certain Amended and Restated Credit Agreement dated as of July 21, 1995
         and amended by the First Amendment thereto, dated as of May 28, 1997,
         the Second Amendment thereto, dated as of June 3, 1999, and the Third
         Amendment thereto, dated as of June 1, 2000, among the Company, the
         Administrative Agent, as Agent thereunder, and the several lenders
         party thereto shall have become effective, or the Administrative Agent
         shall be reasonably satisfied that such effectiveness shall occur
         concurrently with the effectiveness of this Amendment.

                  5. Continuing Effect; No Other Amendments. Except as expressly
amended hereby, all of the terms and provisions of the Credit Agreement are and
shall remain in full force and effect. The amendments provided for herein are
limited to the specific sections of the Credit Agreement specified herein and
shall not constitute amendments of, or an indication of the Administrative
Agent's or the Banks' willingness to amend, any other provisions of the Credit
Agreement or the same sections for any other date or time period (whether or not
such other provisions or compliance with such sections for another date or time
period are affected by the circumstances addressed in this Amendment).

                  6. Expenses. The Company agrees to pay and reimburse the
Administrative Agent for all its reasonable costs and out-of-pocket expenses
incurred in connection with the

<PAGE>   3
                                                                               3

preparation and delivery of this Amendment, including, without limitation, the
reasonable fees and disbursements of counsel to the Administrative Agent.

                  7. Counterparts. This Amendment may be executed by one or more
of the parties to this Amendment on any number of separate counterparts, and all
of said counterparts taken together shall be deemed to constitute one and the
same instrument. A set of the copies of this Amendment signed by all the parties
shall be lodged with the Company and the Administrative Agent.

                  8. GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND
OBLIGATIONS OF THE PARTIES UNDER THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

<PAGE>   4

                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be executed and delivered by their respective duly authorized
officers as of the date first above written.

                         YORK INTERNATIONAL CORPORATION

                         By:
                            -------------------------------------
                            Title:

                         CANADIAN IMPERIAL BANK OF COMMERCE,
                           NEW YORK AGENCY, as Agent

                         By:
                            -------------------------------------
                            Title:

                         BANK OF AMERICA, N.A. as Syndication Agent
                           and as a Bank

                         By:
                            -------------------------------------
                            Title:

                         CITIBANK, N.A., as Documentation Agent
                           and as a Bank

                         By:
                            -------------------------------------
                            Title:

                         CIBC, INC., as a Bank

                         By:
                            -------------------------------------
                            Title:

<PAGE>   5

                         BANCA COMMERCIALE ITALIANA - NEW YORK BRANCH

                         By:
                            -------------------------------------
                            Title:

                         FLEET NATIONAL BANK

                         By:
                            -------------------------------------
                            Title:

                         BANK OF TOKYO - MITSUBISHI
                            TRUST COMPANY

                         By:
                            -------------------------------------
                            Title:

                         BG BANK A/S

                         By:
                            -------------------------------------
                            Title:

                         COMMERZBANK AKTIENGESELLSCHAFT,
                           NEW YORK AND GRAND CAYMAN BRANCHES

                         By:
                            -------------------------------------
                            Title:

                         By:
                            -------------------------------------
                            Title:

<PAGE>   6

                         DEN DANSKE BANK AKTIESELSKAB,
                           CAYMAN ISLANDS BRANCH

                         By:
                            -------------------------------------
                            Title:

                         FIRST UNION NATIONAL BANK

                         By:
                            -------------------------------------
                            Title:

                         HSBC BANK USA

                         By:
                            -------------------------------------
                            Title:

                         NATIONAL WESTMINSTER BANK PLC

                         By:
                            -------------------------------------
                            Title:

                         PNC BANK, NATIONAL ASSOCIATION

                         By:
                            -------------------------------------
                            Title:

<PAGE>   7

                         BANK OF NOVA SCOTIA

                         By:
                            -------------------------------------
                            Title:

                         THE CHASE MANHATTAN BANK

                         By:
                            -------------------------------------
                            Title:

                         ALLFIRST BANK

                         By:
                            -------------------------------------
                            Title:

                         MERITA BANK PLC

                         By:
                            -------------------------------------
                            Title:

                         ING BANK NV

                         By:
                            -------------------------------------
                            Title:<PAGE>   1

                                                                     Exhibit 4.2

                  FOURTH AMENDMENT, dated as of October 4, 2000 (this
"Amendment"), to the Amended and Restated Credit Agreement, dated as of July 21,
1995, as amended by the First Amendment thereto, dated as of May 28, 1997, the
Second Amendment thereto, dated as of June 3, 1999 and the Third Amendment
thereto, dated as of June 1, 2000 (as the same may be further amended,
supplemented or otherwise modified from time to time, the "Credit Agreement"),
among YORK INTERNATIONAL CORPORATION, a Delaware corporation (the "Company"),
the several banks and other financial institutions from time to time parties
thereto (collectively, the "Banks"; individually a "Bank") and CANADIAN IMPERIAL
BANK OF COMMERCE, acting through its New York Agency, as agent for the Banks
thereunder (in such capacity, the "Agent").

                              W I T N E S S E T H :

                  WHEREAS, the Company, the Banks and the Agent are parties to
the Credit Agreement;

                  WHEREAS, the Company, the Agent and the Banks desire to amend
the Credit Agreement in the manner provided for herein;

                  NOW THEREFORE, in consideration of the foregoing, the parties
hereto agree as follows:

                  1. Defined Terms. Unless otherwise defined herein, terms which
are defined in the Credit Agreement and used herein as defined terms are so used
as so defined. Unless otherwise indicated, all Section, subsection and Schedule
references are to the Credit Agreement.

                  2. Amendments to Subsection 1.1. (a) Subsection 1.1 of the
Credit Agreement is hereby amended by deleting the definition of "Consolidated
EBIT" contained therein in its entirety and inserting in lieu thereof the
following definition:

                  "Consolidated EBIT": for any period, Consolidated Net Income
         for such period (excluding, however, (a) any gains from the sale or
         other disposition of assets (other than sales of inventory in the
         ordinary course of business), (b) the effect of non-recurring
         restructuring charges in an amount not to exceed $50,000,000 incurred
         prior to December 31, 1999 in connection with the acquisition by the
         Company of Sabroe Refrigeration A/S and the integration of the
         operations of Sabroe Refrigeration A/S with those of the Company and
         its Subsidiaries, (c) any non-recurring charges incurred prior to July
         1, 2001, in an aggregate amount not to exceed $110,000,000 in
         connection with the profit enhancement initiatives announced in the
         Company's earnings release for the third fiscal quarter of 2000, and
         (d) any other extraordinary or non-recurring gains), before deduction
         for income taxes and Consolidated Interest Expense, determined in
         accordance with GAAP.

<PAGE>   2
                                                                               2

                  (b) Subsection 1.1 of the Credit Agreement is hereby amended
         by deleting the definition of "Consolidated Net Worth" contained
         therein in its entirety and inserting in lieu thereof the following
         definition:

                  "Consolidated Net Worth": at any particular date, all amounts
         which, in accordance with GAAP, would be included under stockholders'
         equity on a consolidated balance sheet of the Company and its
         Subsidiaries at such date, adjusted to exclude therefrom any effects on
         stockholders' equity resulting from any non-recurring charges incurred
         prior to July 1, 2001, in an aggregate amount not to exceed
         $110,000,000 in connection with the profit enhancement initiatives
         announced in the Company's earnings release for the third fiscal
         quarter of 2000.

                  3. Representations and Warranties. On and as of the date
hereof and after giving effect to this Amendment and the transactions
contemplated hereby, the Company hereby confirms, reaffirms and restates the
representations and warranties set forth in Section 4 of the Credit Agreement,
except to the extent that such representations and warranties expressly relate
to a specific earlier date in which case the Company hereby confirms, reaffirms
and restates such representations and warranties as of such earlier date,
provided that the references to the Credit Agreement in such representations and
warranties shall be deemed to refer to the Credit Agreement as in effect prior
to the date hereof and as amended pursuant to this Amendment.

                  4. Effectiveness. This Amendment shall become effective upon
satisfaction of each of the following conditions:

                  (a) receipt by the Agent of counterparts of this Amendment
         duly executed and delivered by the Company and the Required Banks; and

                  (b) the Second Amendment, dated as of the date hereof, to that
         certain 364-Day Revolving Credit Agreement dated as of June 3, 1999
         and amended by the First Amendment thereto, dated as of June 1, 2000,
         among the Company, the Agent, as Administrative Agent thereunder, and
         the several lenders party thereto shall have become effective, or the
         Agent shall be reasonably satisfied that such effectiveness shall
         occur concurrently with the effectiveness of this Amendment.

                  5. Continuing Effect; No Other Amendments. Except as expressly
amended hereby, all of the terms and provisions of the Credit Agreement are and
shall remain in full force and effect. The amendments provided for herein are
limited to the specific sections of the Credit Agreement specified herein and
shall not constitute amendments of, or an indication of the Agent's or the
Banks' willingness to amend, any other provisions of the Credit Agreement or the
same sections for any other date or time period (whether or not such other
provisions or compliance with such sections for another date or time period are
affected by the circumstances addressed in this Amendment).

                  6. Expenses. The Company agrees to pay and reimburse the Agent
for all its reasonable costs and out-of-pocket expenses incurred in connection
with the preparation and delivery of this Amendment, including, without
limitation, the reasonable fees and disbursements of counsel to the Agent.

<PAGE>   3
                                                                               3

                  7. Counterparts. This Amendment may be executed by one or more
of the parties to this Amendment on any number of separate counterparts, and all
of said counterparts taken together shall be deemed to constitute one and the
same instrument. A set of the copies of this Amendment signed by all the parties
shall be lodged with the Company and the Agent.

                  8. GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND
OBLIGATIONS OF THE PARTIES UNDER THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

<PAGE>   4

                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be executed and delivered by their respective duly authorized
officers as of the date first above written.

                                         YORK INTERNATIONAL CORPORATION

                                         By:
                                            --------------------------------
                                            Title:

                                         CANADIAN IMPERIAL BANK OF COMMERCE,
                                          NEW YORK AGENCY, as Agent

                                         By:
                                            --------------------------------
                                            Title:

                                         CIBC, INC.

                                         By:
                                            --------------------------------
                                            Title:

                                         BANCA COMMERCIALE ITALIANA,
                                          NEW YORK BRANCH

                                         By:
                                            --------------------------------
                                            Title:

                                         By:
                                            --------------------------------
                                            Title:

                                         BANK OF AMERICA, N.A.

                                         By:
                                            --------------------------------
                                            Title:

<PAGE>   5

                                         THE CHASE MANHATTAN BANK

                                         By:
                                            --------------------------------
                                            Title:

                                         CITIBANK, N.A.

                                         By:
                                            --------------------------------
                                            Title:

                                         COMMERZBANK AKTIENGESELLSCHAFT, NEW
                                           YORK AND GRAND CAYMAN BRANCHES

                                         By:
                                            --------------------------------
                                            Title:

                                         By:
                                            --------------------------------
                                            Title:

                                         FIRST UNION NATIONAL BANK

                                         By:
                                            --------------------------------
                                            Title:

                                         BANK AUSTRIA CREDITANSTALT

                                         By:
                                            --------------------------------
                                            Title:

                                         CREDIT SUISSE FIRST BOSTON
                                          (formerly known as Credit Suisse)

                                         By:
                                            --------------------------------
                                            Title:

                                         By:
                                            --------------------------------
                                            Title:

<PAGE>   6

                                         FLEET NATIONAL BANK

                                         By:
                                            --------------------------------
                                            Title:

                                         ALLFIRST BANK

                                         By:
                                            --------------------------------
                                            Title:

                                         HSBC BANK USA

                                         By:
                                            --------------------------------
                                            Title:

                                         MORGAN GUARANTY TRUST COMPANY OF
                                          NEW YORK

                                         By:
                                            --------------------------------
                                            Title:

                                         NATIONAL WESTMINSTER BANK PLC

                                         By:
                                            --------------------------------
                                            Title:

                                         NATIONAL WESTMINSTER BANK PLC
                                          NASSAU BRANCH

                                         By:
                                            --------------------------------
                                            Title:

                                         PNC BANK, NATIONAL ASSOCIATION

                                         By:
                                            --------------------------------
                                            Title:

<PAGE>   7

                                         WESTPAC BANKING CORPORATION

                                         By:
                                            --------------------------------
                                            Title:

                                         ING BANK NV

                                         By:
                                            --------------------------------
                                            Title:

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