Temp gauge jumping around on Chevy Venture

MudfrogK5

NAXJA Forum User
Location
Roanoke VA
I'm paranoid it's going to be the head gasket but I'm not having an issue with missing coolant.

Anyway, it's a 99 Venture. The temp gauge will jump around a lot. It's never gone above half way but it will go up and instantly drop down etc. It seems to do it more while idling. I did take a 2 hour trip the other day and I got a CEL, the van would not run correctly until I cleared it. I had no way to check the code so I just reset the computer and I have not had the CEL since.

So I'm thinking either the temp sending unit is bad and threw a false code or the engine really did overheat and the sending unit didn't allow the gauge to show it.

Any thoughts?
 
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