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The thermostat gauge goes back to zero when am but moves when am sitting idle Why is this av got a y reg mondeo?
Wiki User
∙ 15y ago
Got the same problem on my Mondeo 2001 2.0 Petrol. I think this behaviour can be explained by a faulty thermostat. This thermostat sits in the cooling circuit and sends the coolant fluid by the radiator when the engine gets too hot. A faulty thermostat will send the fluid by the radiator all the time. The radiator doesn't provide much cooling when the engine is idling. Hence the fact that the engine gets hot when the wihicle is standing still. When moving, the cooling effect in the radiator, gets much better. This will cause the temp of the engine to fall.
This is due to:
1.The amount of cold air passing the radiator
2.The waterpumps rpm follows the rpm of the engine.
Sending more fluid through the system. All my former cars (had a few) has had the old standard thermostat. A cheap and simple little unit, easy to replace. Cost: about NOK200,- (eq £20).
For this Mondeo, however, Ford has made a large, complex and expensive unit. Cost: about NOK1300,- (eq £130). (Norwegian prices).
Haven't come around doing the actual job just yet. Looking at the exploded picture in the sparepartshop, the job of replacing seems to be fairly simple still. Good luck.
Regards PK (Norway)
Wiki User
∙ 15y ago
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