UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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In allot of cases the high speed cooling fan relays can fail and causes the no high speed operation.Without having high speed this can cause a slight over heat issue when the engine is under load like when climbing a mountain which will cause the water to over flow from the expansion tank.
I would replace both high speed fan relays.These may be able to be obtained from a local parts store.The relays are located in the under hood fuse and relay panel as shown below.Replace these and if the issue does continue then you may have a faulty engine coolant temp sensor needing replaced.
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