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T-Cut · 15th October 2021, 20:18

A i litre of coolant loss per week is rather a lot and must be going somewhere. Be sure you aren't over-filling the header tank! Coolant should be at base of fins when cold. If there's definitely no external signs of 1 litre per week leakqage then you must check the engine oil for coolant/water. Is the oil level obviously going up (dip stick)? If so there's the answer. It could be leaking into the oil at the oil cooler. That's much more common than head gasket leakage.
Get a sample of the sump oil and do a crackle test for water. Place 1-2ml of sump oil on a kitchen foil 'dish' and heat it with a cigarette ligher flame. If it sputters and crackles there's water present.
See this thread for related info: https://www.the75andztclub.co.uk/for...d.php?t=315732
TC

15th October 2021, 20:18	#4
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	A i litre of coolant loss per week is rather a lot and must be going somewhere. Be sure you aren't over-filling the header tank! Coolant should be at base of fins when cold. If there's definitely no external signs of 1 litre per week leakqage then you must check the engine oil for coolant/water. Is the oil level obviously going up (dip stick)? If so there's the answer. It could be leaking into the oil at the oil cooler. That's much more common than head gasket leakage. Get a sample of the sump oil and do a crackle test for water. Place 1-2ml of sump oil on a kitchen foil 'dish' and heat it with a cigarette ligher flame. If it sputters and crackles there's water present. See this thread for related info: https://www.the75andztclub.co.uk/for...d.php?t=315732 TC Last edited by T-Cut; 15th October 2021 at 20:22..