Couple more basic items we need to cross off the list just to be sure we are not missing something.
It is good you see no external leaks and the fans are working. When the A/C is on, you should have both fans running when the engine is at full operating temp. So as it starts to overheat both fans should be at high speed. If they are not then that is the issue. You mentioned that the fans are working so we just need to confirm this is what is happening.
Next we need to actually pressure test the cooling system and make sure it is holding pressure. If you put about 15-20 PSI in the system it should hold it for hours if not overnight.
Here is a guide that will show how to do this:
https://www.2carpros.com/articles/radiator-pressure-test
If this holds pressure then last thing we need to confirm is that we don't have a head gasket that is starting to fail.
Here is how to test that:
https://www.2carpros.com/articles/head-gasket-blown-test
Please run through all this and let us know what you find with this and we can go from there. Thanks
Aug 30, 2021 at 11:23 AM
