Quote:
Originally Posted by Hooverfull
Well, situation has changed. It used to not register above the 110 mark or so, but one day, it actually did on a modest grade. The data from the IR gun was before the coolant boiled over. Now the coolant does boil over on hills.
I can drive on flat land forever. Car runs great. Once there is a hill though, the temp shoots straight up.
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Can you perform one test, please?
Get it good and hot and then bring it home and park it.
The next morning, squeeze the upper radiator hose. Does it feel soft and easy to squeeze or is it quite hard, as though high pressure is in the system?
Now, carefully open the expansion tank cap and observe whether gas forcefully escapes from the cap when you do it. The system might be under a slight vacuum and air might rush into the reservoir. You need to pay careful attention and make a clear determination whether air is rushing out or rushing in.
Report back with result.