Rick's Free Auto Repair Advice

Posts Tagged: erractic heat

Erratic heat and cooling – BMW

Fix Erratic heat and cooling problem on BMW BMW climate control units relay on input from two temperature sensors. The most common failure (aside from failure of the entire control unit which is quite high) is the ambient (outdoor) temperature sensor. The sensor is located in an air duct under the front bumper. BMW puts it there to isolate it from hot air coming off the radiator or A/C condenser. However, that under-bumper area is always hitting curbs. Plastic pieces often break off from this area, and when they do, … Read More

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