Car is overheating

BRAYANGONZA

MEMBER
2006 FORD FUSION
V6
4WD
AUTOMATIC
15,000 MILES

But I have already changed the thermostat. I checked if the water pump works and it does. I checked for any liquids in the ground and nothing. Fans are working I checked the relays fuse everything is good. But the car overheats when I have been driving for maybe 30 minutes or more and when I have the A/C on.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

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