Question about 2003 Pontiac Bonneville

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03 bonneville that only blows out heat once in a while

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  • Pontiac Master
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Could be a lot of things (i.e. thermostat, heater control valve...) Does the temperature gauge reach normal (1/2 way) temps?
Check to see if the control valve is working. Here's one way to do it. On the passengers side, remote the lower panel just under the glove box. Should be a couple of plastic pins holding it in. With the car running at normal temperature, move the hot/cold slider lever to HOT, then to cold slowly and see if the valve (located on top of the heater core) is moving. I "think" the heater control panel is vacuum operated and you may have a split in the plastic hose(s). Listen for a vacuum leak...
Good Luck. I hope this helps.

Posted on Dec 08, 2014

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Posted on Jan 02, 2017

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