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?

The Cooling System Was Flushed And Topped Off To Remedy The Heat Problem ? Was The System Low On Fluid Prior To This ? Was The Cooling System Pressure Tested At That Time ? Recheck the coolant level, again. Check in the recovery bottle and if it has a radiator cap, the radiator. I think it’s pos…

While I would agree with CSA, the problem’s most likely coolant level, do you have any issues with the engine getting hotter than it’s supposed to be? If you’re having overheating issues on top of the heater problem, the impeller on your water pump may be getting worn and need to be replaced (the wh…

I would also bring up yet a different possibility that has nothing to do with the cooling system itself. Rather, I’d guess that you are having an issue with your blend door. This is in the ductwork and controls the air path in the ducts. Many of these are vacuum controlled, and the engine vacuum …

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

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.

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…

Heater works while accelerating, blows cold when release gas

Maintenance/Repairs

Rod-Knox November 15, 2011, 6:38pm 5

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 the cap on the adapter and watch for coolant to dribble out. The air will be gone.

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Heater works while accelerating, blows cold when release gas

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