Question about 1997 Pontiac Grand Prix

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My 97 pontiac grand prix- air blows but only through the defrost. It won't switch to the floor or dash vents.

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Broken/disconnected cable or bad actuator assuming all fuses are fine.

Posted on Jan 23, 2015

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Posted on Jan 02, 2017

jturcotte
  • 8202 Answers

SOURCE: my pontiac grand prix is

Vacuum vents not working: Your vent controller is not working. Is theair coming out the defrost vents? If yes, this is the default when there is novacuum to the switch. In this case, check the small plastic vacuum line that isconnected to the engine intake manifold and going into the firewall. Make surethis line is connected to the manifold and the hose is not cracked. If this isgood, go inside the car and see if you can trace that line to the control switch. If theline is good to the switch, see if you can pull the vacuum connector from theswitch for troubleshooting. with the engine on, check for vacuum on the linefrom the engine with your finger. If the vacuum is there, your switch isprobably leaking and needs to be replace. Any other questions, please reply.

Posted on Jul 01, 2011

  • 217 Answers

SOURCE: 84 Grand Prix. Air only blows from the defroster

you probably have a vaccum leak.check all the hoses for a vaccum leak under the hood around the engine.

Posted on Apr 15, 2011

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Usually a problem with the blend door under the dash.

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heater control could be faulty or vaccum to control unit is not sufficient or possible air duct abstruction not letting switch from floor to defrost.

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My pontiac grand prix is a 1995 the air works fine but will only blow threw floor and defrost vents how can i get it to blow threw dash vents


Vacuum vents not working: Your vent controller is not working. Is theair coming out the defrost vents? If yes, this is the default when there is novacuum to the switch. In this case, check the small plastic vacuum line that isconnected to the engine intake manifold and going into the firewall. Make surethis line is connected to the manifold and the hose is not cracked. If this isgood, go inside the car and see if you can trace that line to the control switch. If theline is good to the switch, see if you can pull the vacuum connector from theswitch for troubleshooting. with the engine on, check for vacuum on the linefrom the engine with your finger. If the vacuum is there, your switch isprobably leaking and needs to be replace. Any other questions, please reply.

Jul 01, 2011 | Pontiac Grand Prix Cars & Trucks

1 Answer

84 Grand Prix. Air only blows from the defroster vent. Will not switch to dash or floor.


you probably have a vaccum leak.check all the hoses for a vaccum leak under the hood around the engine.

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98 grand prix sse. The climate control system doesnt blow cold through the vents? The blower is working ok an the ac system is charged an blows cold out the defrost vents nut not the normal vents or the...


OK, sounds like the vacuum motor system is either disconnected behind the dash, or the vacuum control for the door inside the dash is broken, somehow.

need to take dash and climate controls off to see which it is.

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1 Answer

Blowes air throught defrost vents only


its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

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Does the air blow from the defrost no matter what position you set it at? Vacuum leak.

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