Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMINI2013COOPER COUNTRYMAN, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 170 (TRANSMISSION - OVERVIEW)INTRODUCTIONOVERVIEW OF COMPONENTSTRANSMISSION FLUID HEAT EXCHANGER

2013 Mini Cooper Countryman, Standard Trans

Transmission Fluid Heat Exchanger

2013 Mini Cooper Countryman, Standard TransSECTION Transmission Fluid Heat Exchanger

WARNING: This page does not describe the selected car, but rather 43 other vehicles, including the 2006 BMW M3, 2006 BMW 330Ci, 2006 BMW 325Ci, 2005 BMW M3, and 2005 BMW 330xi. However, it is still accessible from the selected car via links, so may be relevant.

A transmission fluid heat exchanger is located on the bottom edge of the radiator. Transmission fluid inlet and outlet hose fittings are located on the driver's side of the transmission. The heat exchanger provides two functions:

After initial start up, the transmission fluid is warmed up by the engine coolant as it passes through the heat exchanger. The heat exchanger is controlled by an integral thermostat which regulates the transmission fluid flow into the radiator exchanger. In this state the heat exchanger acts as a transmission oil heater.
During operation at higher temperatures, the hot transmission fluid loses heat to the engine coolant when it passes through the heat exchanger and into the core of the radiator. See Fig 1 and Fig 2 .

Fig 1: Locating Transmission Fluid Heat Exchanger (1 Of 2)
Courtesy of BMW OF NORTH AMERICA, INC.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.