Hi y'all-
I've got a '99 (in sig). Recently (3, 4 weeks ago or so?) The OHC temperature started reading high/low, and started changing very slowly. It's not the standard "warm upon startup, then cool while driving", but it will show the temperature, say, 20 degrees colder then it should be, then suddenly 30 minutes later 'jump' to the correct temperature, or 20 deg. higher and jump to the right temp. I replaced the ambient sensor behind the grill, but is there another sensor somewhere it averages the readings from, or is there something else wrong??
Thanks for the help!
-Mack

 

Good question. Maybe your new sensor is bad as well?

 

That's what i'm leaning towards now, seems odd a brand new sensor would be bad out of the box and exibiting the same issues the old one did though....