Re: Engine overheating

Posted by Fish'n Jim On 2023/7/31 15:43:11

what "cooling system sealer" did you use?
If that stuff gets in the radiator and sets, your probably fouled and need cleaned out and the block too!
Don't expect to run with a cracked block* and loose head gasket bolts very long as the bypass will enter the cooling system and foul that too.
Could be your getting hot gases in now and that's causing the temperature gauge to read high. Put a thermal camera/digital pyrometer on the radiator and compare to the gauge. You need to maintain pressure when you go in the mountains, and these old radiators only kept about 7 psi caps so may not be enough for high altitude. They often sold "special" cars for high altitude environs.
Water boils lower at reduced pressure with altitude.
You have to maintain speed to get enough airflow through the radiator to cool. And thinner air will not carry as much heat. The air dams/baffles need to be in place to direct the flow to the radiator in these old cars with no fan shroud.
I suspect your mountain driving is curtailed til it's sorted. What we want doesn't necessarily comply with our wishes.
* - some cracks can be repaired by stitching or other techniques.