I was driving home from work tonight when I happen to glance at my temp gauge "What The......" I'm thinking the thermostat is stuck open. When I sit at idle the temp goes up, but soon as I start moving down she goes.

 

check that your fan comes on at the appropriate time

 

Do you have any modifications done to your cooling system at all?

Has your cluster been altered in any way? Looks like an R tach with a non-R temp gauge.

How far does your temp needle rise when you're at idle?

You may have a open T-Stat, but thats pretty low for the needle to be...

 

Yep they sure do. When I got home I let the car sit at idle, the temp rose to normal and the fans kicked on and off.



Yes I have a 3 core aluminium radiator, running 60/20 mix coolent/water & water wetter additive. And yes I have the R tach with GSR everything else. Its been operating like normal for months, until last night.

 

Sounds like an open thermostat to me. 94

 

^ same, i had this issue and the temp guage would just stay in that area of the pic you posted.

 

oh, so it's not actually overheating? i thought when you said "it goes up", you meant it overheats. t-stat regulates max temperature. so if it's overcooling, it's gonna be the t-stat

 

Likely open t-stat. The needle is lower on your gauge because of the radiator you are using. With that 3 core, you're running your DB way under temps on the highway.

 

Yeah here is a picture I just took while driving into work today 4k @ 75-80mph with the A/C Kicking.

 

Wait, you said, "When I sit at idle the temp goes up, but soon as I start moving down she goes" so if you move faster [75-80MPH, with A/C on] the engine temp. goes up again? 94

 

Yeah thats what it was doing last night. It was about 12:30 at night. It was cool last night. The first pic was taken last night. So today it was mid/hi 80's and thats were the temp was this afternoon. Very Very Very WEIRD

 

Check your coolant level and replace the thermostat. It's a cheap fix.

 

Yep, checked the coolant level before leaving to work. Level is perfect and coolant reservoir was perfect.