My 2002 BMW 325i air condition is not coming manually or when I click the auto button. The fan is not even blowing, so basically nothing is happening! The AC has started slow and then kick in a few minutes later in the past but only a few times.
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Its usually directly on the speed selector know or mounted to the heater plenum behind the glove box (this is the prinicple for american cars sonot sure if foreign makers follow the same principle) its about 2"x2". Very small and looks like a microchip with a circuit and wiring in it...
HI, i have a 2000 323i and it sounds like we have a similar problem. my a/c works fine when the blower is going but some times it goes out of control and it's almost like it has a mind of it's own. and sometimes i turn off the car and the blower keeps blowing air even if the car is completely off and the keys are out. I'm replacing the blower resistor to fix that. i was at the delaer today and spoke to a mechanic and its a common problem on the final stage blower resistor. you have to reach the blower to replace it but its easyer that it sounds.
If warm air is being blown out, then your refrigerant level is probably low. The car is fitted with a safety cut off, to stop the air conditioning system working if the refrigerant (R134a) level is low.
This cut off only effects the air conditioning, the blower would still function normally.