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Discussion Starter · #1 ·
With this snap of cold weather (-4deg c), my missus has started using the heater on her sportage.

Problem is it takes ages to get even luke warm (approx 20 - 30 mins this morning).

The main temperature guage went higher than normal, then settled to it's usual position.

Also, there is a slight knocking sound from near the bulkhead at around 1 second intervals, but this is intermittent. and seems to be related to the heating

I have checked coolant level and strength both ok.

My thoughts are :-

Frozen water in heater matrix?


Any ideas please
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