Seeing as we have been blessed with such lovely weather I have been using my car heater a bit in the mornings and on the way home, whenever I used the heating the temp needle starts droping aprrox to 75 oc, 80, 85 sometimes roughly.
This seems odd and has never happened on any other car car.
It doesnt always do it but I was wondering what I should do or likely causes ?
Is there some kind of coolant temp sensor that could be knackering or the thermostat or something else on this engine ?
1.8 ghia petrol 2004
No issues with the temp needle when the heating is not touched. If I stop using the temp needle it sorts itself out and sits bang in the middle.