1

Alan McAvoy

awm2@chrysler.com

R-1234yf A/C Update
1979 2003

Why HFO-1234yf?

Meet the

directive for a

refrigerant

with a Global

Warming

Potential

(GWP) of less

than 150
• 2016 EPA mandate for corporate fleet average <250

g/mile of CO2

• Lower GWP refrigerant, A/C system leak reduction &

A/C efficiency improvements provide credits for the

manufacturer towards the CO2 requirement

3 types of A/C credits available:

Direct Credits

1. R-1234yf alternative refrigerant (up to 15.8 g/mile of credit

per vehicle)

2. Refrigerant leak reduction on current refrigerant (up to 7.2

g/mile of credit per vehicle)

Indirect Credits

3. System efficiency improvements (up to 5.7 g/mile of credit

per vehicle)

Why R-1234yf?
Developed by DuPont & Honeywell

• SolsticeTMyf Refrigerant (R-1234yf) See www.1234facts.com

• Similar procedures & processes compared to R134a

• Pressure & temperature relationship similar to R134a

R-1234yf
• Alfa Romeo 4C

• FIAT 500 & 500L (FF/BF)

• Ram 1500 (DS)

• Jeep Grand Cherokee (WK)

• Jeep Wrangler (JK)

• Jeep Cherokee (KL)

2015 FCA NAFTA R-1234yf Phase in

• Chrysler 200 (UF)

• Chrysler 300 (LX)

• Dodge Durango (WD)

• Dodge Challenger (LA)

• Dodge Charger (LD)

• Dodge Dart (PF)

Calendar year

Body Code 2013 2014 2015

DS R-1234yf

FF/BF/4C R-1234yf

JC

JK R-1234yf

KL R-1234yf

LX/LD/LA R-1234yf

RT

PF R-1234yf

UF R-1234yf

WK/WD R-1234yf

Sales Code - XFC = Built with R-1234yf A/C Refrigerant
• Ram 1500 / Jeep Cherokee &

Wrangler Wrangler / Chrysler 200 &

300 / Dodge Challenger & Charger

• Denso 7SBH17C Variable

Displacement Compressor

• Dodge Dart

• 1.4L Turbo = Delphi Fixed

Displacement

• 2.0L / 2.4L MultiAir - Denso

7BH17C Variable Displacement

Compressor

• Jeep Grand Cherokee / Dodge

Durango

• FIAT 500 / 500L

• Alfa Romeo 4C

• Delphi Variable Displacement

Compressor

FCA 2015 R-1234yf A/C Compressors (NAFTA)

Clutch & Coil
Mopar only offers 10 lb. disposable

cylinders of R-1234yf to our dealers

• P/N 68224028AA is priced per oz.

with an MSQ (minimum sales

quantity) of 160 (160 oz. = 10 lbs.)

• Part quantity: Dealers are to bill

how much refrigerant is used for the

repair, which is the difference

between the recovered amount and

the charged amount as shown on

the print out from the A/C machine

• Current list price is $9.73 per oz. or

$1,556.80 per 10 lb. cylinder

R-1234yf A/C Refrigerant
R-1234yf System Modifications
R-1234yf Underhood Label
R-1234yf Compressor Oil

Mopar PAG ND-12 Compressor Oil

p/n 68224150AA

• R-1234yf vehicles require new

compressor oils

• DO NOT use R134a PAG oil in

R-1234yf systems as it lacks the

acid reducer required for R-1234yf

systems

• Denso Compressors use PAG ND12 oil which is backwards

compatible with some R134a

systems (Replaces Denso ND8 oil)

• Delphi R-1234yf Compressors use

p/n 68232939AA (PSD-1) Oil
Typical Refrigerant Oil Capacities

Same Compressor Oil Drain Procedure as other Chrysler Vehicles

• Drain all of the refrigerant oil from the old A/C compressor

• Drain all of the refrigerant oil from the new A/C compressor

• Refill the new A/C compressor with the same amount of refrigerant oil

drained out of the old compressor

• Use only clean refrigerant oil of the type specified for the A/C compressor

in the vehicle

CAUTION: Be certain to adjust the refrigerant system oil level when replacing an

A/C compressor. Failure to properly drain and measure the refrigerant oil from

the A/C compressor can prevent the A/C system from operating as designed

and cause serious compressor damage.
A/C Clutch

& Coil

Control

Solenoid

Denso 7SBH17C R-1234yf Compressor

Denso 7SBH17C Variable Displacement Compressor

High

Pressure

Relief Valve
Integral Control Solenoid to reduce or increase the stroke of

the pistons by adjusting the angle of the swashplate

Denso 7SBH17C R-1234yf Compressor

A/C Clutch

Pulley

Swashplate Pistons

Control Solenoid
• A/C Clutch Relay in PDC controlled by the PCM

• Control Solenoid is controlled by the HVAC Module

• HVAC Module calculates compressor displacement based

on A/C load & demand

• Monitored inputs include Vehicle Speed, High side

pressure, Engine RPM, Evap temp, In Car temp,

Accelerator position, Ambient temp, Humidity & A/C

request.

• HVAC module sends a 12 volt PWM signal to the Control

Solenoid to increase or decrease refrigerant flow

• Controls the angle of the swashplate

• Regulates the pressure exerted on the rear of the pistons.

Increased pressure reduces the length of the stroke

• With low A/C demand, swashplate is adjusted to nearly a

zero degree angle to reduce drag & improve MPG

Denso 7SBH17C R-1234yf Compressor
Denso 7SBH17C R-1234yf Compressor

Maximum duty cycle 100% = Compressor at maximum displacement

Minimum duty cycle 11% = Compressor at minimum displacement
• High pressure relief valve vents refrigerant at 3445-4135 kPa (500-600 psi)

• High pressure relief valve closes at 2756 kPa (400 psi) or below

• PCM monitors high-side pressure through the A/C Pressure Transducer

• High Pressure Cut-out above 3140 kPa (455 psi)

• A/C Clutch will re-engage below 2450 kPa (355 psi)

• Low Pressure Cut-out below 110 kPa (16 psi)

• A/C Clutch will re-engage above 221 kPa (32 psi)

Denso 7SBH17C R-1234yf Compressor
Typical R-1234yf A/C Performance Test

Operate the HVAC system under the following conditions

• Ambient temp: 15.5°C (60°F) to 43.3°C (110°F)

• Relative humidity: 20% to 90%

• Engine idling at normal operating temp

• No sun-load, doors & windows closed

• A/C heater controls set to Recirc mode, full cool, panel

mode, high blower with A/C compressor engaged.

• With a scan tool, actuate the engine cooling fans to high

speed

• Insert a thermometer in the driver side center panel air

outlet & operate the A/C system until the thermometer temp

stabilizes or a minimum of five minutes

• With the A/C clutch engaged, compare the panel outlet air

temp, ambient temp & relative humidity to the Maximum

Panel Outlet Temperature chart.
Typical R-1234yf A/C Performance Test

Similar to Chrysler R134a Performance Tests – See Service

Info for specific operating parameters & testing conditions
R-1234yf Evaporator

A/C evaporator tubes

Tapping block & O-ring seals

Evaporator fins

New high efficiency

evaporators must

meet SAE J2842
R-1234yf Evaporator Label

Cautions

Tech must

be certified

Dispose of

properly

See service

procedures

R-1234yf evaporators must comply with the new J2842 SAE

design and certification safety standard. This new safety standard

addresses the flammability risk associated with R-1234yf

refrigerant, high pressures, and possible poisoning in the event of

a release of refrigerant in the passenger compartment. J2842

guidelines state that a faulty evaporator cannot be replaced with a

used evaporator from another vehicle or from a salvage yard. New

evaporators must meet J2842 standards and label requirements.
Cabin Air Filter

Cabin Air

Filters are now

standard on

most vehicles

Replace every

2 years or

20,000 miles
Recalibrated for the thermodynamic properties of R-1234yf

R-1234yf Expansion Valve
• Thermostatic expansion valve

(TXV) design

• Aluminum H-valve type body,

with integral thermal sensor

• Similar test procedure to Chrysler

R134a Systems

• See Service Info for specific

operating conditions & test

procedure

• Freeze the A/C expansion valve

control head for 30 seconds

using liquid CO2

• Suction pressure should drop by

at least 69 kPa (10 psi)

• Allow expansion valve control

head to thaw. Suction pressure

should stabilize at 207 kPa to

345 kPa (30 psi to 50 psi)

R-1234yf Expansion Valve

H-Valve
• Tapping blocks for A/C refrigerant lines

• Integral Receiver Drier

• Condenser & Receiver Drier are not serviced separately &

currently replaced as an assembly

R-1234yf Condenser & Receiver Drier

A/C Lines Condenser

Receiver

Drier
The AGS system is controlled by the powertrain control module

(PCM) over a dedicated network LIN bus. When the ambient air

and engine coolant temperatures are below a specified threshold,

airflow across the radiator is not required. When airflow across

the radiator is not required and vehicle speeds reach a calibrated

threshold, the PCM will command the shutter vanes to close.

Active Grille Shutters (AGS)
Integrated IHX

Assembly

Integrated IHX Assembly
From Evap

To Evap

From Cond

To Compressor

R-1234yf A/C Lines – Integrated IHX

Hose in Hose Internal Heat Exchanger Line (IHX)

• Co-axial design with the liquid line to the evaporator on the outside &

the suction line to the compressor on the inside.

• Improves A/C efficiency & performance

• Also used on some R134a Chrysler vehicles
• Larger diameter R-1234yf ports to prevent crosscontamination

• Higher collar & shoulder on High-Side port prevents R134a

couplers from attaching to the R-1234yf service ports

R-1234yf New Service Ports
• R-1234yf service caps are gray in color

• R134a service caps are black in color

R-1234yf New Service Caps
A portion of the highpressure line, including

the high-pressure port, is

made of plastic

Jeep Renegade R-1234yf A/C System
• Must meet SAE & ISO standards - SAE J2843

• Integrated Refrigerant Identifier

R-1234yf Recovery/Recycle/Recharge Equipment
Robinair R-1234yf A/C Machine

Robinair Model 10500 shipped to all FIAT Chrysler Dealers

as an essential tool (similar to the Robinair AC1234-6)

mopar.snapon.com
Robinair R-1234yf A/C Machine

DLC Connector

Oil Drain

Identifier & Filter

Filter

ISV
Robinair R-1234yf A/C Machine

R-1234yf A/C machine print out

provides:

• Date & Time

• Ambient Temp & Humidity

• High & Low Side Pressures

• Amount of R-1234yf Recovered

• Amount of R-1234yf Charged

• Purity of refrigerant & % of air

• Vehicle Identification Number

• Warranty code
Adding Refrigerant Oil

The Robinair machine meets oil cross-contamination

requirements for high-voltage systems

• Empty the oil drain bottle before starting a recovery

• Oil collected drains into the graduated oil drain bottle

• Remove the bottle and measure oil

• Amount of oil removed from the A/C system is the amount of new oil to be

charged into the A/C system after evacuation is complete

• Add the recommended new oil to replace the oil removed during the

recycling process

• A standalone R-1234yf Oil Injector is recommended to add oil. Robinair

18460 is available to FIAT Chrysler dealers through Mopar Service

Equipment (MSE) mopar.snapon.com or www.robinair.com

Robinair 18460 Oil injector for R-1234yf
2012 & later FIAT Chrysler

vehicles with R134a or

R-1234yf have fluorescent

refrigerant leak detection

dye installed at the factory

• A wafer is installed into

the receiver drier

desiccant bag during

manufacturing

• Wafer dissolves when

the A/C system is filled

at the assembly plant &

the dye then circulates

throughout the system

Factory installed Leak Detection Dye

www.tracerline.com
Mopar A/C Leak Detection Dye for service is supplied by

Bright Solutions

Leak Detection

Only use electronic leak

detectors that conform to

SAE J2913 for use with

R-1234yf

Mopar R134a Leak Detection

Dye p/n - 04798219AB

‘Bright Solution’s announces that

its A/C Dye Products have been

successfully tested, approved and

now certified to meet the new SAE

J2297 Standard for both R134a and

R-1234yf refrigerants

www.brightsol.com
• Robinair 22791 R134a & R-1234yf Electronic Leak Detector

is available to all FIAT / Chrysler dealers thru the Mopar

Service Equipment (MSE) mopar.snapon.com

• 3 sensitivity levels down to 0.15 oz./year

• Automatically recalibrates in highly contaminated areas

• Senses CFC, HFC, HCFC blends & R-1234yf refrigerants

• Meets SAE J2913 for R-1234yf & SAE J2791 for R134a

• Advanced infrared sensor designed to last 10 years

• 8-hour lithium ion battery

Robinair 22791 Leak Detector

www.robinair.com
KL / UF HVAC Controls

Manual or Dual Zone Automatic Temperature Control

Radio with Touch

Screen Controls for

HVAC

• CAN IHS Bus

Message from

Radio to HVAC

Control Module

A/C Switch Panel

• CAN IHS Bus Message to

HVAC Control Module

• HVAC Control Module is

located behind the Radio
KL / UF HVAC Sensors

Sun Load Sensor (Center of

dash near defroster outlets)

Humidity Sensor

(attached to

windshield behind

rear view mirror)

Evap Temp Sensor
KL / UF HVAC 5-wire Actuators

5-wire Actuators

• Right & Left

Blend Door

• Recirc Door

• Mode Door
KL / UF HVAC Sensors

A/C Pressure Transducer

3-wire sensor mounted on

liquid line

Ambient Temp Sensor

2-wire thermistor mounted behind

the grille or in the left outside

mirror on some models
KL / UF HVAC In Car Temp Sensors

Left & Right Floor Air Outlet Temp Sensors

Left & Right Panel Air Outlet Temp Sensors

In-car Temp

Sensor &

Aspirator

Motor
KL/UF HVAC Housing

HVAC Housing

HVAC Module

Center Console

Duct

Heater Core

Left Blend Door

Mode Door

IP Panel Duct

Defroster Duct

Duct Outlet Temp

Sensors
HVAC Control Module – Direct Inputs

• Evap Temp Sensor

• Vent (Duct) Temp Sensors

• Up to 4 with Dual Zone ATC

• Left & Right Panel Outlet

• Left & Right Floor Outlet

• In Car Temp Sensor with aspirator

motor

• Door Actuators (5 wire)

• Mode / Recirc / Left & Right

Blend (Dual Zone) with 3-wire

position sensors

• Sun Sensor Assembly

• Left & Right photo diodes (ATC)

• Auto Headlamp sensor

HVAC Module - Bussed Inputs

• Ambient Temp Sensor (BCM)

• Humidity Sensor (BCM)

• A/C Pressure Transducer (PCM)

• A/C Switch Panel Input

HVAC Module - Direct Outputs

• A/C Compressor Control Solenoid

• Blower Motor Power Module

• Door Actuators (5 wire)

• 2 wire motor drivers for Mode /

Recirc / Left & Right Blend (Dual

Zone ATC)

HVAC Module - Bussed Outputs

• A/C Request to PCM

• Rear Defroster Request to BCM

KL/UF HVAC Control Module

HVAC

Module
OAT

Organic Additive

Technology 2013 -

HOAT

Hybrid Organic Additive Technology

Orange or Pink based on vendor

2000 - 2012

IAT

Inorganic Additive

Technology – Up to 2000

Mopar Coolant Changes
Mixing HOAT & OAT Coolants

• Mixing Coolants can cause gelling & plug the cooling system

• Also nullifies the additive package = no corrosion protection

• OAT Coolant is designed for newer engine materials, not

recommended for 2012 & older vehicles

• Not all OAT coolants are the same, each manufacturer has

their own formulation

• Flush vehicle twice with water if mixed
2013-15 Engine Oil & Change Intervals

Current Engines requiring Synthetic

Motor Oil

• All Dodge Darts

• 1.4L Turbo = SAE 5W-40

• 2.0L/2.4L = SAE 0W-20

• All SRT vehicles

• All Jeep Renegades

• All Alfa Romeo

• RAM Trucks

• 6.7L Cummins - 5W-40, up to

15,000 mile oil change interval

• Ram 6.4L Hemi

• All 2.4L Cherokee & Chrysler 200

• All 3.0L V6 EcoDiesel

• ProMaster 3.0L Diesel

• By 2016 Model Year over 50% of

Chrysler & FIAT vehicles will

require synthetic motor oil
wiTECH 2.0 Scan Tool Application

FASTER TECHNOLOGY

Significant improvements to speed,

performance & ease of use

MOBILE ACCESSIBILITY

-Web based application

-Streamlined flash process

-Easier updates, no software to

install on your PC

-2004 & later CAN Bus Vehicles

-DRB Emulator (1998-2007)

-MicroPOD II hardware less

expensive than VCI Pod or

StarMOBILE
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