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sean, UK Ford Master Technician
Category: UK Ford
Satisfied Customers: 3105
Experience:  Ford Master Tech since 2001 & MOT tester mechanic since 1984.
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Ford Galaxy: My car keeps overheating only above 40 mph and

Resolved Question:

My car keeps overheating only above 40 mph and not when idling. I have changed the thermostat and semi flushed thro. Could it be the water pump if so where is it ?.
I have ran the engine at speed whilst stationery and no overheating
I have a feeling that this is an intrinsic fault with this model

Over to you
Submitted: 5 years ago.
Category: UK Ford
Expert:  sean replied 5 years ago.

Hello, I hope I can offer you some assistance.

From your description this will be due to the impeller on the water pump coming adrift. The impeller is plastic and when it comes adrift the water pump shaft rotates but the impeller doesn't which means no coolant circulation. The water pump is driven by the timing belt so is behind the timing belt cover when replaced a new timing belt is required .

The reason the engine doesn't over heat at idle is that modern diesel engines are very thermally efficient so not much heat is produced at idle, only when there is a load on the engine does it start to produce more heat.

You are correct in that this is quite a common concern on this engine.

Let me know if I can assist further and I'll reply as soon as I can.

Best wishes,


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