Texas4x4

Just went through cooling system in ZJ, replaced radiator, therm, and hoses because it was overheating even while driving down the highway. It stays nice and cool now when driving, but if I sit in it for a while with the A/C on full blast it will slowly creep up over 210 and keep going. This was after about 10 minutes of it running. Is this a common thing for the 5.2 or do I have some other issues. Any knowledge on this question?

Texas4x4

Anyone?

Dan4governor

all engines run the hottest at idle, its very common. When driving the engine is constantly rushing new coolant in from the radiator and pushing the hot air out the exhaust. When idling, this process is a lot slower so the engine heats up faster. You're fine as long as your temp doesn't get in the red zone while idling.

Texas4x4

Thanks, just never had a car that the temp would keep climbin, normally it would just level off.