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Re: bmw 1998 318ti auomatic
Verify the engine cooling fan runs at idle without the AC on, it should come on around just past 1/2 scale on the temp guage, do not let it overheat! these engines have aluminum cylinder heads and u can blow the head gasket out, let me know the results
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My guess is that your electric fan is NOT operating at all. Under normal conditions, just going down the highway, your cooling system will function just fine without a fan running. The air flow through the radiator is adequate to keep things cool. However, when you stop, you quickly get into an "overheat" situation. Actually, you should be able to hear your fan begin operating when your engine temperature starts climbing or your air conditioner requires the fan to do its thing. Note: If you've ever severely overheated your engine, your problems may be worse than just a fan not running, but you really do need to confirm whether your fan is operating correctly, or not. Another note: I had a vehicle with a tendency to overheat when stopped. It turned out to be a faulty (leaking) pressure cap on the cooling system.
You should start by checking the thermostat for the radiator. It controls the flow of coolant to your engine. Turning on the heater allows the coolant to circulate through another type of radiator. You should also check your radiator fluid to make sure you have enough( the fluid should be changed around every 5 years).
Guys, I have Toyota Revo 2001 manual diesel. Its getting overheat only during idling or heavy traffic. We overhauled the radiator, new radiator cap and hoses, new thermostat, the fan is ok. the pump is quiet (no noise). Still, its getting overheat. please help me guys! Thanks!
The cooling fans will not come on until 225 degrees. Normal temp is around 199-215. Sitting still in traffic most will inch up around 220 or so. When you turn ac on it turns the fans on and may cool down engine, Check fan operation.
sounds like a partially plugged radiator. Colder temps will be OK but when weather warms up the problem shows up too...check for leaves etc between the radiator and ac condenser before doing anything else. Stuff on the outside will act the same way as an internal obstruction.