My 2003 Buick Century heater works fine while accelerating but as soon as I release the gas the air begins to cool, swiftly. I have had the radiator flushed and the coolant topped off but the problem persists. Any ideas?

All the McParts stores sell a Prestone flush kit that includes various sized couplings to allow attaching a garden hose to a heater hose. Those adapters make great bleeders for the cooling system. Installed in the highest point in a heater hose, top off the radiator, start the engine (cold), loosen …

I interestingly had a similar problem, it ended up fan speed 1 and 2 were burnt out on the variable resistor, a quick easy cheap fix.

Previous Comments: “Rather, I’d guess that you are having an issue with your blend door.” " I interestingly had a similar problem, it ended up fan speed 1 and 2 were burnt out on the variable resistor, . . . “ “I think it’s possible that you’ve got air getting in your “closed” cooling system (an…

It sounds like there is a problem with the cabin temperature. Possibly the blend door is out of whack due to a vacuum leak that is causing the door to open or close at the wrong time.

To: AlanY, Thank You ! From: The Department Of Redundancy Department Three days ago, Cigroller suggested, " Rather, I’d guess that you are having an issue with your blend door." CSA

I puzzled over that since it is a little bit backwards. What I would actually surmise is that there is a vacuum line that split someplace and leaks only under relatively high vacuum - as in when the throttle snaps closed. Low coolant doesn’t fit either if it cools “swiftly.” I guess it depends on…

I am going to finally bring the car in tomorrow to have it assessed by a mechanic. Sorry if I wasn’t clear in my description. The fans work fine in the car, the air is blowing as it should according to the level that I have it set on. It doesn’t matter the setting (low-med-high) or whether I have se…

I am guessing a restricted heater core; let us know.

Heater works while accelerating, blows cold when release gas

Maintenance/Repairs

oldtimer-11 November 18, 2011, 3:34pm 10

The blend door might act up when accelerating due to low vacuum but not when letting up (high vacuum). I think it is low coolant level and would follow Rod Knox ecellent suggestion or unbolt the overflow jug and hold it high to let air out of system.

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Heater works while accelerating, blows cold when release gas

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