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Old 12-21-2012, 05:20 PM
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Engine is running too cold?

I have a 1973 Javalin with a 232 6 cylinder and manual 3 speed transmission. I had a stock radiator that kept splitting open and leaking so I decided to replace it with a similar size new aluminum radiator. Ever since I installed this radiator the engine does not reach operating temperature. Now that winter is here, the heater does not blow hot air. To remidy the problem I put a piece of cardboard in front of the radiator with a hole cut out in the center about 4.5 inches in diameter. To my surprise this did not help one bit. The gauge starts out reading below the cold mark then comes up to the cold mark as you drive the car. With the old radiator the needle would pass the cold mark by 3/8 inch which indicated normal operating temperature. The radiator is the only thing I changed out. Everything else remains the same in the car. The problem occured right after I installed the new radiator.

Any ideas on what to do?

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Old 12-21-2012, 05:26 PM
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Originally Posted by HotRodMan View Post
Any ideas on what to do?
I'd start by installing the stock temp thermostat.

Last edited by techinspector1; 12-21-2012 at 05:31 PM.
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Old 12-21-2012, 05:44 PM
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aluminum transfers heat pretty efficiently. i've heard other people say the same thing after they dropped aluminum radiators into their rides.
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Old 12-21-2012, 09:55 PM
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check the fluid level,check upper and lower hoses with bare hands,make sure warm water is coming out of the engine.then you will know something??? thermostat might be open
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Old 12-21-2012, 10:47 PM
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I side with Tech and Vinnie and Hcompton Check the thermostat!!!!

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Old 12-22-2012, 05:09 AM
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I had problems with low heat in my Ford Expedition and assumed that it was not the thermostat because I had replaced it with a new OEM 195 degree thermostat when I serviced the cooling system. However, after several months of troubleshooting I finally replaced the thermostat again with another new one, which solved the problem.

Thermostats are a simple device, but I've learned to always test them before installation. Some open too early or too late, and others don't seem to react fast enough to keep a stable engine temp under varying load.

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