Running hot
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Joined: Oct 2015
Posts: 65
Likes: 6
2016 C4 of Year Finalist
noth
I'm surprised no one mentioned to check the radiator cap. Just because it looks shiny on the outside doesn't mean it's holding pressure. A month ago I took the cap off my '94 and pressure tested it.....Wow, it would not hold any pressure, the rubber seal was shot. Got a USA made cap from the auto parts store for $6 (or you can pay big bucks for a GM cap) and now I run about 15 deg cooler. Hope this helps someone. Cheers!
Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
Team Owner
Joined: Jul 2004
Posts: 28,471
Likes: 3,290
From: Hartford WI
Lets do this. Lets see what the ECM says the temp is and shine an infra red gauge on it and see what that says. If the scantool says the temp is 200 and the thermometer says 150, you have an issue. If they are about 10 degrees different, life is good. That will tell is which direction to go.
