Lincoln Repair Questions? Ask a Mechanic for Answers ASAP
Good morning my name is ***** ***** I can help. Coolant should never come out from the cap. Sounds like you have a bad radiator cap. I have found in my experience that the radiator cap is one of the most commonly failed parts of the cooling system. A lot of mechanics overlook this very important part. A radiator cap actually helps reduce cooling system temperatures below the boiling point. If a cap is failing, it can no longer maintain pressure and the coolant begins to boil.
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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
The idle speed going up and down is not an overheating sign. Loss of coolant is though. The primary thing to check for AC use overheating would be the cooling fan. Can you verify it is running during this scenario?
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Hello again Chris here,