Q: Overheating Engine (Part 5)
I have tried everything suggest but I just can not find the problem to my overheating problem. I am about ready to give up and move north. Any ideas?
A: One guy on the post (forgot name) may have been close when he suggested that over heating in the first gen birds was due to the design of the cars front end. An old time radiator man I often go to said that the firebird radiators are the smallest ones Pontiac has ever put in cars and expected them to do so much ie. cool big V8s.
This guy also had an excellent tip for a mysterious overheating problem. All you overheaters may be over looking the old head gasket leak.
A head gasket can develop a small leak near a water jacket. The problem may not effect the performance of the car and often is undetectable until the overheating starts. When the leak in the gasket develops between the combustion chamber and the water jacket, a small amount of compressed air is forced into the coolant while the engine is running. The results are large pockets of air forming where the water should be and turning to steam from the hot spots in the block. The results are overheating followed by blowoff over flow.
The check the old guy gave me goes like this: Disconnect the fan belts so the water pump will not turn. Disconnect the top radiator hose at the radiator and hold it up vertically while filling the radiator with water until you can see the water in the end of the hose you are holding. While everything is cold (engine, water) start the engine and watch the water in the end of the hose for small bubbles. They will appear before the hose gets to hot to hold and the indecate a bad head gasket.
This whole deal works. I used it on my 1969 and found the cracked gasket…Old radiator Bill impressed me on another occasion when I plopped down a radiator in his shop and he eyeballed it for a few seconds and proclaimed, ” that’s from a 1967 GTO!
Good luck with the heat
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Content last modified: January 15, 2014 at 8:57 pm