Question about BMW Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
The auxillary fan is used for AC cooling purposes, and your vehicle
under normal circumstances should not overheat regardless of the status of the auxillary fan.
That being said, the auxillary fan is controlled by the PCM based on AC switch position via a fan control relay in your fuse box under the hood. There is no fan switch for it, as it is turned on based on PCM observance of AC control switch position.
Some things to look at regarding your overheat condition:
When the vehicle begins overheating, what are the conditions of the radiator hoses? Are both firm, or only one and the other soft? Are both hot, or is one hot and the other only warm?
Both a failed waterpump and a failed shut thermostat will show a hot hose on one side and only a warm hose on the other side of the radiator.
A failed (stuck shut) thermostat will also result in one very firm hose (highly pressurized and nowhere to go with the thermostat shut) and one relatively soft hose.
You can take the radiator cap off (BEFORE it pressurizes) and watch the water level as the car runs. If the thermostat is opening and waterpump is pumping, you will see fluid flow once it gets to operating temperature.
Watch your engine fan and see if it is engaged or just spinning freely. When warm and the engine shut off, the fan clutch should be engaged making the fan more resistant to turn. If it spins freely, the clutch is failing.
Check the area around the radiator and between it and the condenser for obstructions to airflow.
Obviously check the condition of the coolant for heavy scale/sludge. The 3.0/3.5 engines are notorious for turning coolant into thick rusty puddy.
Hope this helps!
Posted on Sep 11, 2009
It could be several reasons...1. make sure you dont have to bleed the coolant system, on some cars you have too, because there is air in the system, and the car will overheat..2. Your waterpump maybe bad also..3. Double check your coolant temp sensor, and or coolant temp switch..maybe faulty..4. Check your radiator cap...seal could be bad, and not sealing correctly...Question..How long does it take before it overheats...and are you getting any white or grey smoke out of the tailpipe? If so, then your head gasket is blown...Goodluck
Posted on Dec 04, 2009
I just did a FREE write up on air purge from coolant system and how to
detect initial state of blown head gasket at the Fixya tip selection.
or follow link below.
Posted on Dec 06, 2009
If it's not under the hood, then the only other place BMW places their batteries is in the trunk. Since it's a Sport Wagon, pull up where the rear spare would be and it will be there, usually on the right hand side.
Hope this Helps,
"Still living on the Right Side of Dirt..."
Posted on May 18, 2010
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