overheating problem.expanson tank bleuw up.so i replaced the expansion tank,thermostat and the rad.fan switch still over heating in the trafic.how do i check the rad fan if it is working or not
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2004 BMW X3 Question: 2004 bmw x3 3.0
Answer #1pushrod June 27, 2013, 08:29Master
Start it up, ac off, and let it run at ilde. The fan should come on, after awhile, before it overheats!
test the fan 1st with power and ground
Answer #3M & R Car Import Services II, Inc (68 Answers) , Chicago, IL - (773) 840-8204M and R Car Import June 27, 2013, 14:18Technician
On your vehicle you have a primary fan (Mechanically operated by fluid displacement) Only way to test the fan clutch is with engine off and cold engine. Carefully inspect if front of fan clutch is oily? Indicating not enough internal fluid to operate as designed. Also have your secondary fan (electrically control) because sounds like that was the cause of original cooling system failure.