Question about 1992 Plymouth Grand Voyager

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Ac duct the flap in the dash for the ac and heat keeps changing on its own it will not blow out on you it will blow on the floor or the widow it dosen't mater what button you put it on it blows where it wants to

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thats the whole heater control(button) box, if your handy you can remove it , remove neg battery cable. gently remove dash plastic with butter knife with tape on it (it pops out) then youll have to use a phillips/allen screwdriver to take control box out .make sure to tape all the hoses and mark them or use a digi cam , go to the junk yard and get one itll be around 20.00.. No money? try and locate the main vacumn line to the heater control box in the engine compartment and plug the one going in AND out. It will be stuck on one setting but its better than that.

J Meredith

Posted on Jul 09, 2008

  • Jude Meredith
    Jude Meredith Jul 12, 2008


    that also may be the vacuum reserve tank may be cracked and is leaking somehow, listen under the hood and maybe go to the junkyard for parts




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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?

A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

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Your particular actuator will be a different one than they found.
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Thermostat wouldn't likly cause that. You've probably got a problem with the system that controls the flap doors in the duct system for heat and AC. The flap door may be stuck in the AC position. If you have no heat in the rest of the vehicle either, the switch between heat and AC may be the problem.

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You could have leaves plugging the vent intake.
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I had heat in the drivers side climate control but not the passenger, now i have no heat. It only blows cold air. My AC works perfect yet no heat. the dash there are flaps which control's hot or cold, those flaps break and then you will only have cold air blowing. You will have to remove the dash and renew those flaps

Nov 17, 2009 | 2004 Jeep Grand Cherokee

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I have same prob. on a 1998 Town Car.Stays on heat when AC on.

I posted in wrong window. I intended to post resolution. I ordered the section of ducting with the climate control flap in it. From lincoln ( Ford ) dealership. I will remove dash and install the part tomorrow. I have a small mobile mechanic service on Possum Kingdom lake near Graford Tx. 76449. Thank you for geting back to me.....

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Dec 10, 2008 | 1998 Chevrolet Lumina

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I've had 2 Astros. A 1993 and a 1994, and had a problem with the heat/AC on both of them. They blew only air through the defroster no matter where I set the control, heater, A/C, floor or vent.

Both times the problem was with the VACUUM hoses in the engine compartment. The hoses had become dry, brittle and then cracked. The hoses are black tubes about the size of a drinking straw, and about 12" to 14" in length. Look for hoses that are hanging loose, they usually break off from junctions where 2 or 3 lines come together.

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