| Originally posted by macninja99@Dec 16 2004, 08:32 AM |
i have a 2002 smg m3 conv and when i turn the car on the electric ac fan comes on and spins like crazy and will not turn off -
i have repalced the sensor in the hose- no difference
pluged a new fan -no difference
changed the little black box by the radiator- no difference
upper hose gets real hot - lower hose stays cool- thinking thermostat ??
rad colant is full
the clutch fan the way it works when the car gets real hot the clutch fan stiffens up and spins faster -mine just spins cold or hot i can still stop the fan clutch with my fingers --any ideas??
In addition to the DME getting the water temperature to operate the fan it can operate it as well if it detected a high pressure in the A/C cycle.
I had a case like this and here is my recommendation on how to try to solve it:
1- Do a battery rest by removing the negative cable of the battery for 10 minutes and then reconnects it. This will clear the DME faults if any is there.
2- remove the plug of the sensor on the radiator outlet and see if this will lower the fan speed. This is to be done while engine is running and wait after plug removal for at least 1 minute. If nothing happens, proceed to step 3.
3- Remove your A/C panel and disconnect the plugs in there, all of them, and see if the fan speed gets lower. If it lowered, then most probably you have a defective A/C pressure sensor (this one fit on the dryer bottle) or the 5V supply going to is lower than 5V.
Tell us how did it go....