Thermostat? - Page 3

James.uk · 22nd October 2013, 23:53

Don't add cheap sealing muck to your engine please, it is a bad idea OK..

The cooling system in your car is mainly water, and water boils at 212f 100c I think. But if you pressurise the system then it doesn't boil untill about 220f ish.. And cars cooling systems are under pressure once the engine gets hot...

So.. If you get a leak in a pressurised system running above 212f, as you did, then the pressure drops and it will start to boil, which yours did. All that is a pain, but perfectly understandable-normal..

So you just need to fix the leak, and replace any lost coolant fluid.

When you select "demist" on your dash, this causes the internal heating fan to run to clear the mist, and the engine fan to run to keep the air con condenser cool. Both fans should run... OK.

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22nd October 2013, 23:53	#1
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	Don't add cheap sealing muck to your engine please, it is a bad idea OK.. The cooling system in your car is mainly water, and water boils at 212f 100c I think. But if you pressurise the system then it doesn't boil untill about 220f ish.. And cars cooling systems are under pressure once the engine gets hot... So.. If you get a leak in a pressurised system running above 212f, as you did, then the pressure drops and it will start to boil, which yours did. All that is a pain, but perfectly understandable-normal.. So you just need to fix the leak, and replace any lost coolant fluid. When you select "demist" on your dash, this causes the internal heating fan to run to clear the mist, and the engine fan to run to keep the air con condenser cool. Both fans should run... OK. ...