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SD1too · 16th October 2021, 13:52

Hi Julian,

I know that the procedure says to wait for the fan to start running but in most weather conditions the engine won't reach the required 100˚ at a continuous idle so I do more or less what you've done!

With the air conditioning running it's true that the radiator receives increased airflow but it will often be at a higher temperature than ambient due to the heat loss from the condenser. Engines with the standard 88˚ plastic thermostat assembly will run at a minimum of the low nineties even with the air conditioning working.

Let us know if there's any improvement in the coolant loss Julian which was the problem you presented.

Cheers,

Simon

16th October 2021, 13:52	#7
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,383 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Hi Julian, I know that the procedure says to wait for the fan to start running but in most weather conditions the engine won't reach the required 100˚ at a continuous idle so I do more or less what you've done! With the air conditioning running it's true that the radiator receives increased airflow but it will often be at a higher temperature than ambient due to the heat loss from the condenser. Engines with the standard 88˚ plastic thermostat assembly will run at a minimum of the low nineties even with the air conditioning working. Let us know if there's any improvement in the coolant loss Julian which was the problem you presented. Cheers, Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.