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now it needs to be pressure tested for an internal or external coolant leak. If the water level keeps dropping in an engine the coolant temp sensor will never tell the computer when to turn the fan on. was the air ever purged out of the cooling system? Because, the temp sensor will never get a reading if coolant levels are low and will never tell the computer when to engage the fan. Does the A\C work? Does the fan come on for the A\C?
I assume you mean the radiator fan. This might be indicative of a different problem. The main issue is, does the car overheat? If not, then it's probably a thermostat that's stuck open. A lot of things can fail in the fan system...the fan motor itself, a fuse, a relay, or the temperature sensor that tells the fan to turn on.
Auxiliary Cooling Fan Circuit Fuses Fuse 16 is 5 amps located in front power distribution box under hood, drivers side near rear of engine compartment.
Fuse 41 (ex. M44 w/man. trans) is 30 amp (probably not your car) in front power distribution box
Fuse 48 (M44 w/man. trans only) is 40 amp (The auxiliary fuse box in trunk for E36 is on the right side of trunk behind the trim panel.)
'tis the season. Check the fuses to see if they are good. You may need to wiggle them a bit and if they are the old style with the exposed metal strip, check closely for small cracks. If the fuse is good and the contacts are not corroded, it may be the resistor.
This assumes that the blower is not moving any air at all. If the problem is the air won't blow through certain vents, that's a vacuum line problem.
check the relay, most probably under the hood, and check the fuse, most probably under the steering wheel near pedals. If u have two fans, most times the 2nd fan is driven by a strap from hte 1st motor, if so, check to see if its broken. If it does need a strap, should turn freely by hand since it has no motor or strap.
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