Car goes from C to H ?

Asked by Feb 24, 2017 at 09:44 PM about the 2008 Mercury Milan V6

Question type: Maintenance & Repair

This is an issue I've been having periodically. If I'm stuck
in traffic for a certain period of time my car will start to go
from the needle being between C and H then make its
way up to H ! Now my mechanic stated he noticed the
cap on the antifreeze reservoir wasn't tightening
thoroughly. It appeared that the fluid I had there drained
out completely when it overheated and I'm
Wondering if the cap is the reason possibly as to why.

3 Answers

120,255

I would fix the cap issue but you are probably due for a cooling system service. Hoses, radiator flush, thermostat etc. Also make sure the cooling fans are turning on.

1 people found this helpful.
87,215

I would look for other reasons than that cap. Like are the fans turning on, on the radiator? Without the fans working the engine would heat up.

1 people found this helpful.
24,535

Now that its been overheated, check for head gasket leaks, Compression test, Exhaust in cooling system, White smoke from tail pipe, Water in oil.

1 people found this helpful.

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