A method for producing a device for the exchange of heat, in particular for motor vehicles, with the following steps: - joining of at least one fluid passage means with at least two fluid distribution and/or collecting means (3a, 3b) in a force-fit and form-fit manner, - joining of at least one fluid inflow and outflow means with at least one of the at least two fluid distribution and/or collecting means (3a, 3b) in a force-fit and form-fit manner in the region of at least one opening provided in the fluid distribution and/or collecting means (3a, 3b), the opening having at least one limiting form element, wherein the form of the form element is geometrically tuned or adapted to the form of the fluid inflow and outflow means in such a manner that at least one connection surface between the form element and at least one part of the end section of the fluid inflow and outflow means is created via the relative movement of an end section of the fluid inflow and outflow means relative to the form element, wherein the fluid inflow and outflow means is prefixed at the fluid distribution and/or collecting means (3a, 3b) in a self-locking manner through the size and/or form of this connection surface, wherein the relative movement is made through insertion of the fluid inflow and outflow means into the opening, - substantially gas- and/or fluid-tight fixation of the prefixed device for the exchange of heat relative to the environment by means of at least one firmly bonded connection, wherein - the self-locking prefixation of the fluid inflow and outflow means at the form element of the opening of the fluid distribution and/or collecting means (3a, 3b) in the form of a force-fit connection is made such that the end section of the fluid inflow and outflow means has an outer cross-section which substantially tapers to the end and is inserted into the form element of the fluid distribution and/or collecting means (3a, 3b) with an inner cross-section which substantially widens to the outside, and wherein - the self-locking prefixation of the fluid inflow and outflow means at the form element of the fluid distribution and/or collecting means (3a, 3b) in the form of a force-fit and a form-fit connection is made such that the end section of the fluid inflow and outflow means has a form which is substantially conical to the end and is inserted into the inner conical form element of the fluid distribution and/or collecting means (3a, 3b). - joining of at least one fluid passage means with at least two fluid distribution and/or collecting means (3a, 3b) in a force-fit and form-fit manner, - joining of at least one fluid inflow and outflow means with at least one of the at least two fluid distribution and/or collecting means (3a, 3b) in a force-fit and form-fit manner in the region of at least one opening provided in the fluid distribution and/or collecting means (3a, 3b), the opening having at least one limiting form element, wherein the form of the form element is geometrically tuned or adapted to the form of the fluid inflow and outflow means in such a manner that at least one connection surface between the form element and at least one part of the end section of the fluid inflow and outflow means is created via the relative movement of an end section of the fluid inflow and outflow means relative to the form element, wherein the fluid inflow and outflow means is prefixed at the fluid distribution and/or collecting means (3a, 3b) in a self-locking manner through the size and/or form of this connection surface, wherein the relative movement is made through insertion of the fluid inflow and outflow means into the opening, - substantially gas- and/or fluid-tight fixation of the prefixed device for the exchange of heat relative to the environment by means of at least one firmly bonded connection, wherein - the self-locking prefixation of the fluid inflow and outflow means at the form element of the opening of the fluid distribution and/or collecting means (3a, 3b) in the form of a force-fit connection is made such that the end section of the fluid inflow and outflow means has an outer cross-section which substantially tapers to the end and is inserted into the form element of the fluid distribution and/or collecting means (3a, 3b) with an inner cross-section which substantially widens to the outside, and wherein - the self-locking prefixation of the fluid inflow and outflow means at the form element of the fluid distribution and/or collecting means (3a, 3b) in the form of a force-fit and a form-fit connection is made such that the end section of the fluid inflow and outflow means has a form which is substantially conical to the end and is inserted into the inner conical form element of the fluid distribution and/or collecting means (3a, 3b).