[Ajrothm]

Just an FYI for future searchers...

I also had the “fan stays on high and temp gauge on 0”... No check engine light on. Fan would run full speed for 10-15 mins after the engine was shut off.

After driving the car for an hour, I noticed there was no pressure on the upper radiator hose, this led me to believe the engine really was running cool.

I pulled out the thermostat, it appeared to be stuck open slightly. So I got a new stat, compared/measured them and the original stat was open about .060” or so. Not much, but it was enough.

Changed the stat, cleared the two codes it had stored (p480/p691). Started it up and within 5 mins was showing some temp on the temp gauge and the fan was not running.

So in my case, it was NOT the coolant temp switch. The car is bone stock and has 51k miles.


Afterwards, I boiled the old thermostat, it opened WAY up and stuck there. Even freezing it, it would not return to close or even move at all...

Thermostat was $120 at the dealer and it was in stock.