Good morning, I would like to know if the temperature that reaches my car is right, I tried the thermostat in a pot and it opens at a precise 90 degrees, but it seems to me that the engine is running cold.


Thanks

 

Well, the actual coolant temp should be at least as high as the thermostat rated temperature and, in your case, since you've tested the thermostat, I suspect it is. And, typically, this would result in a mid-scale gauge reading which, in your case, it isn't.

I suspect simply an inaccurate reading on the gauge. This might be the gauge itself, the sending unit, or dirty/weak connections.

I'd begin my simply checking/cleaning/tightening the connection at the sending unit.

Are the other gauges working OK? If not, it might suggest a problem with the grounds, or voltage supply, to the dashboard.

Cheers
DD

 

This is exactly where my needle sits at full operating temperature. After checking with a laser temp gun, I stopped worrying about it.
(';')

 

Sounds like it's overheating...I battled my '97 XK8 for awhile before solving a similar running hot problem...was a couple years ago, so perhaps I can point you in the right direction, if not pinpoint the problem.

Here's something else to check...On the overflow tank part of the cooling system at the top of the engine near the firewall, there are two hoses leaving the tank. On some model year cars, one of the hose tangs is blocked off. That's the hose that goes to the top of the radiator (I'm pretty sure). The open hose goes to the outlet pipe at the center top of the engine. Make sure that the open tang goes to that outlet pipe. Confusing the issue, the cooling system can be made to work with a tank that has two open tangs or one open tang. And on a '97, who knows which tank you have. When there are two open tangs, you may (or may not?) have to route your hoses in a certain way.

I would check to see if the hoses have been installed correctly.