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T-Cut · 13th December 2019, 13:56

That doesn't bode well. There's a significant excess pressure in the cold system, which usually means only one thing. I guess you know that already?

With my 1.8T on stationary tickover, the low speed fan trips on at 104C and runs for perhaps 30- 45 seconds. It turns off at around 97-98C, while the temperature usually continues dropping to below 90C (in today's cold conditions). This pattern will then repeat every ten minutes or so.

Your system is overheating, so tripping the high speed at around 112C which continues running for up to fiver minutes after switching off the engine. The excess cold pressurisation can only be exhaust gas I'm afraid.

The temperature gauge is useless, staying at 9 o'clock from 75C to 115C. That in itself isn't a big issue in a sound sytem. On cooling down, there would be no excess pressure in the header tank.

You can verify these temperatures by checking out the Trip Screen Diagnostic Mode:https://www.the75andztclub.co.uk/for...ad.php?t=55585

TC

13th December 2019, 13:56	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	That doesn't bode well. There's a significant excess pressure in the cold system, which usually means only one thing. I guess you know that already? With my 1.8T on stationary tickover, the low speed fan trips on at 104C and runs for perhaps 30- 45 seconds. It turns off at around 97-98C, while the temperature usually continues dropping to below 90C (in today's cold conditions). This pattern will then repeat every ten minutes or so. Your system is overheating, so tripping the high speed at around 112C which continues running for up to fiver minutes after switching off the engine. The excess cold pressurisation can only be exhaust gas I'm afraid. The temperature gauge is useless, staying at 9 o'clock from 75C to 115C. That in itself isn't a big issue in a sound sytem. On cooling down, there would be no excess pressure in the header tank. You can verify these temperatures by checking out the Trip Screen Diagnostic Mode:https://www.the75andztclub.co.uk/for...ad.php?t=55585 TC Last edited by T-Cut; 13th December 2019 at 14:02..