Having problems with your 1983 Buick Regal ?
Defrost won't work
Make sure the function control that switches the air flow has vacuum from the engine, it goes to a vacuum canister storage can under the hood, the location is listed on the federal vacuum and emission routing sticker.
If the air does not blow out of the defrost vents, check the control and the vent door actuators for a vac leak.
Repair Help & Product Troubleshooting for 1983 Buick Regal
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