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I thought I seen a post on here but cant seem to find it on the heater not blowing out full blast threw the vents. when im stopped I get good air coming out the vents but any time driving it does not come out wortha ****. if I turn it to defrost it seems to work just fine, someone I thought said a vaccum line? any ideas?
If you have the vacuum operated controls - 2000 and earlier, there's a check valve in the line near the brake booster. If it isn't working properly the vents will change as you accelerate/decelerate.