stacwday426 Posted June 16, 2021 Share Posted June 16, 2021 Need some assistance.. Mondeo is constantly over heating within about 10/15mins of starting driving. Replaced expansion tank and thermostat but no good. When idling I can see the coolant level dropping but can’t find any leaks! Any advice? Quote Link to comment Share on other sites More sharing options...
nicam49 Posted June 17, 2021 Share Posted June 17, 2021 Where to start.... are you getting any white smoke out of exhaust? If yes, then likely to be head gasket, a garage should be able to do a pressure test, or a sniff test to detect traces of hydrocarbons in the coolant (tho harder to detect in a diesel), or you can buy a sniff test kit online. Are you getting heat from the heater... if not, then I'd suggest water pump.. as its tucked away you probably won't see a leak, and the coolant is probably drying up as if leaks out, so you won't see any tell-tale drips. Quote Link to comment Share on other sites More sharing options...
stacwday426 Posted June 18, 2021 Author Share Posted June 18, 2021 No white smoke out the exhaust and runs fine so ruling out the head gasket. Booked it into a garage now.. heater runs hot for few mins then goes cold. Has to be leak just a very hard to detect one. Quote Link to comment Share on other sites More sharing options...
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