Question about 1996 Oldsmobile Aurora

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Overheating car My car is overheating, but only when i turn the heat on or defrost or AC. I am very confused on what seems to be the problem. I have replaced the thermostat and flushed radiator changed cap... The car runs fine as long as i dont turn these on. Anyone no the answer. The car is a 96 chevy cavailer with 105000 on it.

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Hello,

when the car overheats, is there still water in the radiator?
If there is water in the radiator and the car overheats, then it means there might be some dirt or blockage in the radiator or condenser.

When the car is on the motion, air passes through the front and assists the fan to cool the engine. There are situation whereby air doesn't have free flow because of blockage in the radiator and condenser. Dust and debris can cause blockage. If this be the case, have your radiator washed thoroughly and cleaned.
If there is no water in the radiator when the car overheats, then there is a probably a leakage from the water pump. Or maybe your fan isn't blowing properly. The fan might be blowing weak air.

The above are what could cause your engine to over heat.
So start the check from the radiator. Poor water into the radiator, wait for some minutes, look under the car and observe if water is going to leak. If there is a leak, it might be from the water pump or a leaking hose.

If water from radiator has no leak, have your radiator washed and clean the condenser has they might block air that is suppose to cool the engine.

Also, make sure your fan is blowing properly or well enough to cool the engine.

Make sure you have the above checked thoroughly as they are the major causes of problems like this.

This overheating problem could lead to a burnt gasket and this can dry the engine oil which will eventually knock the engine. So have this problem fixed to prevent further damage that will cost you more money.

Lastly, remove the hose that connects the radiator to the engine, water from the engine will come out. Pour water into the radiator, the water will flow through the hose down to the ground. Do this severally. Now connect the hose back to the engine, pour water into the radiator. Start the engine, the water in the radiator will reduce, add more water till radiator is full.
In summary, the major cause of over heating problem is from the radiator, fan, water pump, blockage in the hose, and dirt in in/on the condenser. These are area you need to concentrate on.

Also, bleed the system. Let me know if you don't know how to bleed for directions.....

I forgot to mention that the acceleration meter or engine meter on the dash board shouldn't be more the 5. It should be below 5. If it is above 5, it can cause overheating. I hope you understand what I mean.....

Regards.

Posted on Sep 29, 2011

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This is a fairly common problem. The engine is overheating because the secondary fan is most likely not coming on. Here is a good way to check. With the car in park and the engine idling turn on the air. When the air is on the secondary fan should start. If the fan doesn't start then you have found the problem. The fan relay is usually the problem. You can locate this relay by looking in your owners manual. also check the fuse and the plug at the fan for a loose connection. hope this helps. Good luck.

Posted on May 11, 2009

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