Heat exchanger automatic transmission BMW E53 diesel
The automatic transmission heat exchanger in the BMW E53 diesel performs the important function of cooling the transmission fluid. It is located between the main radiator and the A/C radiator and uses engine coolant to remove heat from the transmission fluid.
Operating principle
The heat exchanger consists of two circuits: the transmission fluid circuit (primary) and the coolant circuit (secondary). Transmission fluid circulates through the primary circuit, and coolant circulates through the secondary circuit. Heat is transferred through the walls of the heat exchanger from the hotter transmission fluid to the cooler coolant.
Design
The heat exchanger of the BMW E53 diesel automatic transmission is a plate heat exchanger. It consists of thin metal plates that are soldered or welded to form a series of channels through which fluids circulate. The plates have a zigzag shape, which increases the surface area for heat transfer.
Dimensions:
*Length: about 300mm
* Width: about 200mm
*Thickness: about 25mm
Signs of malfunction
* Automatic transmission overheating
*Transmission fluid leak
* Metal shavings in transmission fluid
* Burnt transmission fluid smell
Replacement
Replacing an automatic transmission heat exchanger is a complex procedure that requires removing the automatic transmission. It is recommended that you have a qualified mechanic perform this work.
Price
The cost of a new automatic transmission heat exchanger for BMW E53 diesel is about 250-400 US dollars. Replacement costs, including parts and labor, can range from $500 to $1,500.