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Heater temp doesn't remain constant problem


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We had a good run out in our Vr6 engined Galaxy the other day.

We can get plenty of hot and cool air coming through the vents inside the car but the problem is that the the temperature when set on high keeps fluctuating hot and cold through the vents. It seems that the faster you go the cooler the air, slow back down adn you get nice hot air.

Also when you're at m'way speeds the engine temperature gauge barely registers but as you slow down the gauge moves up to normal.

The car was supposed to have had a new thermostat fitted when the head gasket was changed just prior to my buying it. Theres no issues with coolant loss, overheating, mayo etc.

Any ideas guys?

Cheers Nath

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