Thread: Thermostat temp 88 or 82?

I'm thinking you had a different problem.
If it was stuck open, why would it run rich?
You would have constant unregulated hot water flowing all around the system,
not cold water..........

Originally Posted by discovery39

I'm thinking you had a different problem.
If it was stuck open, why would it run rich?
You would have constant unregulated hot water flowing all around the system,
not cold water..........

Well I guess I can not be sure it was stuck open. But on the last day the temp gauge move up nearly 1/3 of the way and the engine was running well. The previous 2 days the gauge was indicating only just over the beginning of the white marking and was not running so well. It was interesting as it was colder on the 3rd day and i had the heater on. The previous 2 days i tried not to have the heater on in an attempt to not cool the coolant more using the heater core.

I just figured the thermostat was cooling too efficiently on the first 2 days and assumed that meant it was stuck open. The reason i thought it might be running rich is because the ECU may have still thought the car had not heated up yet and over fueled for cold running. It also would not idle in gear smoothly on a flat surface, the car kept jumping forward a little when the idle speed increased rapidly then dropped away then repeated.

Thermostat controls coolant going through the radiator. If its stuck open it means full flow through radiator and engine will run cool if taking easy.

G`day ,

82 for gas 88 for petrol .

The EFI has an optimum temp and that will be with what the factory suggests .

If yours is actually a classic or soft dash then turning the heater off will stop the flow .

If your RR is any of the earlier models they have a constant flow and no tap , heat is altered by moving flaps but the actual heater core is always getting hot coolant .