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Temp guage intermittent


Craig855S

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Right guys. My temp guage does something very wierd when the car is started from cold

 

start car with heat setting on cold and face vents only

the temp guage doesnt move at all,and the engines been running over 5 minutes

Flick the heater temp to hot and the temp guage on the dash rises

after that the temp guage behaves as normal. Its as if u need to make the water go thru the heater matrix before the guage registers.

 

How many temp sensors are there??is there one on each side of the thermostat? maybe the one on the engine side of the thermostat is knackered and when the stat opens the water gets to the sensor on the radiator side?

 

altho if theres only 1 temp sensor thats that idea shot down

 

help

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