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Could any one please tell me what is the correct expansion tank cap for a mk3 mondeo petrol 1.8 The original one's details have worn off .

I have googled my problem and i have a part no 98BB 8100 AB which is a cap with a pressure of 120 kpa  how ever in the haynes manual it states the cap should be 124-145kpa  the working pressure of the cooling system is 138kpa . The reason for my query is a small amount of coolant is being vented from the hole in the tank neck where i assume it releases pressure.

I hope some kind soul can help me with this problem.

Regards 

Tom

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Hi this may or may not help but if the coolent is getting past the cap along bottle neck or vapours are escaping past the seal a few passes of plumbers tape on the bottle treads will solve it and re seal the cap / long or short term 

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