Having problems with your 1994 Pontiac Grand Am ?

1994 pontiac grand am heat works but wont blow on the winshield to defrost

Posted / edited by AnonymousUser on : 27-06-2022

Answers :

Check for a vacuum problem,under the hood,going to the fire wall inside the car,there is a check valve also,that is made of plastic,that maybe bad,it is on passengers side,with a vacuum going to it,and one coming out,going into the inside of the car.Make sure the check valve is allow vacuum only one way,remove it,and using your mouth,try and blow threw it,on each end,if it allows air both ways,then this is your problem,Then remove the ac/heater control,and check the vacuum plug on the rear of the control.If it is fine,then replace the vacuum switch.
Had the same problem found a broken vaccum line under the battery tray on the drivers side fixed the line defrost works fine now
\015\012hope this helps broape
Repair Help & Product Troubleshooting for 1994 Pontiac Grand Am

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