Car overheated
07-21-2003, 08:42 AM
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Car overheated
Yesterday I put in a new AC belt and fixed a vaccum leak that was only allowing the cold air flow only through the defrost vents. I hadn't used the AC becuase of this vaccum problem. Well, I fixed my vaccum problem and the AC airflow was corrected. I ran the car for about 15 minutes park the car but left on for about 20 minutes and it started to overheat...... I did notice that the AC intercooler fan wasn't working...could that be the problem...
1982 US 928
1982 US 928
07-21-2003, 09:34 AM
#4
Nordschleife Master
It sounds to me like more than one thing could be wrong.
Check the fan operation by removing the connectors at the temp sensor and shorting them together. The fan should come on with the ignition. The sensor is at the lower left-side corner on the front of the radiator. Those connections can get corroded.
Was the engine idling up a bit? With the A/C on it should be to pump more coolant and get the mechnical fan going faster.
Besides those things, I'm surprised it got that hot. Was it really hot out at the time?
Check the fan operation by removing the connectors at the temp sensor and shorting them together. The fan should come on with the ignition. The sensor is at the lower left-side corner on the front of the radiator. Those connections can get corroded.
Was the engine idling up a bit? With the A/C on it should be to pump more coolant and get the mechnical fan going faster.
Besides those things, I'm surprised it got that hot. Was it really hot out at the time?
07-21-2003, 10:41 AM
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I assume you mean 100 degrees Centigrade or 212 degrees Farenheit. Have you changed your coolant lately or done anything to your coolant system that could have gotten air into it? Your coolant should not boil out of your reservoir at 100 degrees.
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07-21-2003, 11:38 AM
#8
Nordschleife Master
Sounds like it was plenty hot during the test.
Check the fan operation. It should be on before the coolant boils.
If the coolant was coming out before the needle was in the red, I would also look at the radiator cap. But be careful. Putting a new one on can have a disturbing effect of making old hoses burst.
Check the fan operation. It should be on before the coolant boils.
If the coolant was coming out before the needle was in the red, I would also look at the radiator cap. But be careful. Putting a new one on can have a disturbing effect of making old hoses burst.
07-21-2003, 11:47 AM
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There are several possible problems here:
The electric fan should have been running. Check the fuse and relay.
It is very possible - even likely - that if the coolant has been drained recently, that there is/was an air bubble in the system. Carefully fill the system, leaving the pressure cap off, and get it up to temp again. Carefully massage the main radiator hose, so as to make the coolant in the bottle jump. Be sure to keep the coolant in the bottle above the center seam. If you do a search on "burp", you will find some additional tips on getting the air out of the system.
The electric fan should have been running. Check the fuse and relay.
It is very possible - even likely - that if the coolant has been drained recently, that there is/was an air bubble in the system. Carefully fill the system, leaving the pressure cap off, and get it up to temp again. Carefully massage the main radiator hose, so as to make the coolant in the bottle jump. Be sure to keep the coolant in the bottle above the center seam. If you do a search on "burp", you will find some additional tips on getting the air out of the system.
07-21-2003, 12:31 PM
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