Friends car overheating in traffic and when idling,he had coolant
10-04-2003, 07:35 AM
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Re: Friends car overheating in traffic and when idling,he had coolant
If the fan isn't coming on it could be:
1) Temp Sensor.
2) Fan relay
3) Fan
4) Fusible link. Not sure your if car has one.
If the car has a/c the fan should run when the a/c is on.
1) Temp Sensor.
2) Fan relay
3) Fan
4) Fusible link. Not sure your if car has one.
If the car has a/c the fan should run when the a/c is on.
10-04-2003, 07:42 AM
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The fan is working-actually he wired a manual switch to turn it on
when overheating.We just revved it up to 3K RPM and the coolant temp went all the way to first solid mark on temp gauge and the fan did not kick in.Temp sensor?
10-04-2003, 11:55 AM
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It could also be the auxiliary water pump...
I had hot engine symptoms for a while when my pump got blown up in traffic this past summer. When I had the pump replaced the water temp went back to where it was before. You could also have plugged radiator, or it could even be just full of bugs stuck on the outside.
Good luck,
Zsolt
Good luck,
Zsolt
10-04-2003, 02:03 PM
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Nope,it was getting hotter and hotter,I could see coolant bubbling in the
expansion tank.My friend wired a switch straight to ventilator so he can turn it on manually without waiting for it to turn on by itself(which doesn't happen).Hope it clears...
10-04-2003, 02:35 PM
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Re: The fan is working-actually he wired a manual switch to turn it on
Then its either the sensor or the relay. You can pull the connector off the sensor and short across the connector terminals to see if the fan will run.
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10-04-2003, 03:10 PM
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Re: Nope,it was getting hotter and hotter,I could see coolant bubbling in the
Are the upper and lower radiator hose close to being the same temperature (very very hot) when the car overheat? If the upper hose is a lot hotter than the bottom hose them you might have a clogged radiator. If the temperature sensor is located close to the bottom hose (Quattro V8 sensor is located this way) and a clogged radiator is preventing the hot coolant from reaching the sensor, then the fan will not come on because the sensor does not see an overheat condition.
There is also a fan resistor which is used to control the radiator fan speed (low, med, and jet plane taking off).
There is also a fan resistor which is used to control the radiator fan speed (low, med, and jet plane taking off).
10-04-2003, 05:40 PM
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Re: I don't own a 100 but I expect you'll find the sensor bewteen the upper
and lower radiator hoses on the passenger side of the radiator. The sensor screws in the connector can be tough to get off but it plugs onto the sensor.
Like QV8 says it could be a plugged radiator especially if the fan is coming on. Usually the fan running even on lo speed cools my 5000 right down. So if you have the fan running off a switch it probably doesn't matter what the sensor is doing.
Might want to check the t-stat also. They can break shut. The t-stat housing is off one of the radiator hoses at the block.
Like QV8 says it could be a plugged radiator especially if the fan is coming on. Usually the fan running even on lo speed cools my 5000 right down. So if you have the fan running off a switch it probably doesn't matter what the sensor is doing.
Might want to check the t-stat also. They can break shut. The t-stat housing is off one of the radiator hoses at the block.