Hi,

I am new on this forum and I have a question about the overheating issue on my 2000 4 door Focus automatic with 66K current miles.

It started in the past few month ago, when I drive up hell or on the FWY during traffic jam with the A/C on, the temperature will goes up near the redline and once I turn off the A/C, the temperature will drop back to normal.

I took the car to my friend's shop for check out, the overheating problem never occurred. The coolant level, radiator fan, switches are all works fine so we couldn't get the problem solved. I have got the car back for 4 days now and the overheating problem doesn't seem to appear again.

I am curious and wondering what could possibly happen.

Thanks.

 

Sound's like the thermostat is getting stuck !!