Heater temperature varies widely

Dec 09, 2005 2 Replies
R
90 Bonneville. With the car warmed up and at steady speed, the heater temperature will vary from lukewarm to baking hot, perhaps every 3 or 4 minutes. Forces me to constantly adjust temp or open windows.

Temp gauge shows steady. Coolant level OK. Water pump maybe 2 years old.



This is an odd one. Any hints?


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H

Mine actually does the same thing sometimes.( manual system ) I think it might be a thermostat just not opening enough then opening suddenly. I got a new radiator & heater core in early 2004.

My temp gauge points to the second line and a little under when it does this. And it only does it when its really cold out, say under 28 degrees.

Harryface

05 Park Avenue, 32,672 91 Bonneville LE 304,883
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M

Sounds like air/bubble somewhere in your kooling system.

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