Quote:
Originally Posted by carock
If your radiator is original then you need a new one. They don't last 35 years.They corrode and lose a lot of efficiency with time.
If your car has a coolant leak then you need to fix it. Any coolant leak will substantially lower the cooling performance of your car. I am not sure why but I had it demonstrated to me that if you put a leak in a perfectly running car, then you will make it overheat much more easily. Don't believe it? Then repeat the experiment and draw you own conclusion.
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Under pressure the coolant boils at a much higher temperature. So any leak point that removes pressure lowers the boiling point.
As the fluid comes up to temperature it creates expansion of the coolant. creating the pressure you need. At 105c indicated. If a leak let the pressure escape. The radiator cap valve would open and spill some fluid out the line from the neck of the rad. in a tight system. Your leakage point served the same funtion.
Normal test is to get a system pressure tester. You pump it up and see if the system holds pressure.If there is system leakage you will see where it is as well. Also of course if it will not hold pressure. With that out of the way. You then try to find out why it got that hot to start with. Old radiator is always one possible suspect.Yet not the only possibility.