Re: 1950 Packard 288 Auto overheating HELP
Posted by BigKev On 2010/2/2 13:04:49
There is a large amount of Heat Soak that happens after running a motor.
I can drive my Colorado truck, turn off the motor when it is at the 1/2 mark on the temp gauge, come back in 10 mins and start it again and for about 10 seconds it will be at the 3/4 mark until the coolant really gets circulating. This always worried me as the temp gauge in my truck has no temp markers just a L - H. So I bought a little computer unit that you can leave plugged into the ODBII port. This shows you what the computer is reading. The difference on my truck between 1/2 (~195) and 3/4 (~205) is about 10 degrees. So after I say that I stopped worrying. I leave the little computer plugged in as it show other gauges on it that my truck doesn't have on the cluster.
At highway speed you have all that airflow through radiator, and also the water pump turning at a higher rate. So that helps to offset the thermal load being produced by the motor when it is working. Suddenly come to a halt, the motor rpm drop, the waterpump slows down, the air flow through the radiator reduces (except for the fan draw). But still have that thermal load that was there from driving a few moments ago, and now it going to take longer to dissipate it. So the water temp rises until it can catch up.
This also could be a case of a too sensitive temp gauge, where a small change in temp is swinging the gauge wildly. As others have said, if it was indeed overheating, then it should be pushing fluid out at the overflow tube unless the tube was pinched off. But even then I would imagine it should start leaking out the cap itself.
Just my
I can drive my Colorado truck, turn off the motor when it is at the 1/2 mark on the temp gauge, come back in 10 mins and start it again and for about 10 seconds it will be at the 3/4 mark until the coolant really gets circulating. This always worried me as the temp gauge in my truck has no temp markers just a L - H. So I bought a little computer unit that you can leave plugged into the ODBII port. This shows you what the computer is reading. The difference on my truck between 1/2 (~195) and 3/4 (~205) is about 10 degrees. So after I say that I stopped worrying. I leave the little computer plugged in as it show other gauges on it that my truck doesn't have on the cluster.
At highway speed you have all that airflow through radiator, and also the water pump turning at a higher rate. So that helps to offset the thermal load being produced by the motor when it is working. Suddenly come to a halt, the motor rpm drop, the waterpump slows down, the air flow through the radiator reduces (except for the fan draw). But still have that thermal load that was there from driving a few moments ago, and now it going to take longer to dissipate it. So the water temp rises until it can catch up.
This also could be a case of a too sensitive temp gauge, where a small change in temp is swinging the gauge wildly. As others have said, if it was indeed overheating, then it should be pushing fluid out at the overflow tube unless the tube was pinched off. But even then I would imagine it should start leaking out the cap itself.
Just my
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