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Old 12-05-2008, 03:29 PM   #1
DR.ZED
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Join Date: Jun 2003
Location: Toronto, On, CANADA
Posts: 480
Front aux fans not coming on.

Wanted to get some feedback in here about this.

1985 325e.

Replaced the two sensors (top for low speed bottom for high speed). Jump the leads at the sensor and the relays work and the fans come on. Turn on AC and the low speed fan comes on.

I originally though my thermostat was opening all the way and limiting the flow of coolant through the rad but just did a thermostat no change. New waterpump and hoses.

I let the car get to 220F and not even the 1st stage sensor grounded (195). I am suspecting a plugged rad at this point.

Any thoughts?

FYI went from electric front fan (that died) back to a clutch fan and did these tests without the clutch fan on. Incase you were wondering how I got the car to 220F.
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Old 12-05-2008, 05:37 PM   #2
derkleineman
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the location of the sensor is not the best in the cold side of the radiator so best would be to install the sensor somewhere else like in the top pipe what goes to the rad
that way the messurment is more exact and the fan will go on sooner and not always that late

but some fans only go on in conjunction with the AC in on position for that please check
as it is in my car like that
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Old 12-05-2008, 08:08 PM   #3
DR.ZED
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Quote:
Originally Posted by derkleineman View Post
the location of the sensor is not the best in the cold side of the radiator so best would be to install the sensor somewhere else like in the top pipe what goes to the rad
that way the messurment is more exact and the fan will go on sooner and not always that late

but some fans only go on in conjunction with the AC in on position for that please check
as it is in my car like that
Yes the fan comes on no matter what temp at low speed once the AC is on.

On the eta engine the side of the tank where the sensors are is the hot side.

I agree with maybe moving the sensor.
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Old 12-05-2008, 08:43 PM   #4
derkleineman
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then it wont come on when the engine is getting to hot or you would have to do a small modification in the fuse panel where the relay is

when i remeber right i was putting on pin # 85 on the relay a plus when the ignition is on i also used a sensor with a lower setting in order to eliminate the clutch fan and that setup works great second option would be usable for electric waterpump and fan to avoid coocking in the summer sun after the engine is shout off
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