FRporscheman

I was gonna say the same thing, word for word.

I never see smoke so it's OK for now...

fpena944

First time it happened to me I freaked out. I was driving in Manhattan, looked down and saw my temperature gauge just pegged to the top red line. Pulled over, turned the car off immediately and waited a minute.

Then I turned it back on and everything was normal - that's when I knew it wasn't a cooling system issue.

FRporscheman

I realized it was an electrical issue when one day, while driving, I looked down at my temp gauge, and I saw it shoot from normal temp to pegged at the top in 1 millisecond. I confirmed it was electrical when I smacked the top of the dash and it got fixed.

KLR

I have this exact problem too, and whacking the top of the dashboard always the sets it right temporarily. It improved a lot after I cleaned the "footballs" on the back of the gauge cluster, but it still happens with some regularity. I had hoped that this would go away after I added an Iceshark (RIP, friend) auxilary ground at the front of the motor and put in his heavy duty battery ground cables, but no dice. Has anyone completely resolved this by cleaning other grounds (i.e., those under the dash), or should I just dive in, remove the cluster again, and try taking another shot at the temp gauge football?

It's very irritating and I can't imagine that whacking the dash top is doing anything good for the longevity of my gauge cluster, etc. It also freaks the hell out of passengers -- they think that I'm having a schizophrenic break, as i otherwise treat the car with kidgloves.

PorscheG96

I posted my fix for this a couple days ago in the 968 forum:

https://rennlist.com/forums/968-forum/393200-overheating-it-could-be-your-grounds.html

All brass surfaces being cleaned [grounding posts, nuts, washers] has completely solved my temp gauge problems.