Out today and was on the interstate when I noticed the engine temp was elevated. No warnings or anything. I recently had the heater core, water pump, coolant tank, aux pump and hoses replaced. Got to my destination without issue and when I shut the car off the gauge looked like this.

I shut the a/c after I noticed it was warm.

Any ideas why it would stay up like that even with the engine off?

 

I notice that you did not replace the thermostat which can cause problems as well

as the housing which can deteriorate and cause a partial blockage.

The other possibility is the temp sensor itself also the gauge has been

described as an an idiot gauge.

There are a number of apps etc which you can buy to measure the temp much more

accurately eg Torque and an ELM 327.

Why was it necessary to replace all the parts which you have described?

 

It was leaking at the heater core, coolant tank, hoses and the aux pump. Replaced them all. Not sure if the thermostat was replaced. Trying to find my receipt.

Doesn't the super V8 have a metal housing? Does that break down too?

 

When you turn the key to the ignition position does the needle dip below the lowest line? It should mirror what the fuel gauge does as it goes through its self-test. If not, suspect you have a gauge problem rather than a temperature problem.

This might help; http://www.jagrepair.com/images/TSB/...%20Cluster.pdf

 

Funny you mention that. I noticed that self test function for the first time today. When it was stuck above the blue portion when the car was off, when you turned the key it would dip to the bottom of the temp gauge rather than below the line.

 

Could it be an issue of calibration of the gauge?
I notice that your gauge seems to be always slightly above what should be "normal", also when the ignition is off (above the blue instead of below).

 

If you have a code reader with live date that might help mine sometimes goes up to half way when I start the car then drops down

 

Do bear in mind that the temperature gauge is a rather odd one.

It starts to move from minimum around 65C and reaches the halfway point at 85C

From 85C to 115C it stays on the halfway point ie it doesn't move.

From 115C to 125C it moves from the halfway point to maximum.

So it looks to me as if the pointer has somehow become shifted up by one division.