Question about GMC Suburban

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The damper controls will not transfer to the dash area. Only operates on the floor vents. Also the rear AC is not providing cool air

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U have a door actuator not working under dash,,,no cold air in rear is either low of freon or needs a new expansion valve in rear

Posted on Jul 01, 2009

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1 Answer

Why does 1 side of dash blow hot and the other cold when ac is on with the dual climate control?


Check the actuator motor on the heater it directs the air into the vents. There is probably two of them be sure to check both. The motor makes the vents move and again directs the air where you want. Hope this helps.

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not sure why you want to bypass it , this gismo moves damper under dash to allow wether you get cold or hot air out of vents depending on what you select on dash control (hi /low vents) if theres a problem with it most times it comes from ac condensate collection pan drain clogging up and water spills over into duct work rusting the damper shafts making it impossible for damper movers to move them , producing a fault or hot or freezing cold air all the time , sorry no easy fix for this but removing underdash ductwork and cleaning / replacing them lots of hours upside down with your feet on seats and head under dash , just kidding ...... most times we just take front seats out that makes plenty of room

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How to repair 2004 Ford Crown Victoria A/C will not blow from dash vents


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Ac only comes out of defrost and floor vent, not dash


The ducts have dampers that work off of a vacuum and control the flow of air to the different air vents at the top, bottom and face of the dash. Sometimes the vacuum lines come loose or break. You'll need to look under the dash to see if any of these conditions exist.

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1 Answer

Rear Floor Vent heat only


Sounds like your heater coolant hose door flap is broken or loose. May want to check behind the heater controls, if your components are mechanically operated. If electronically, may need to perform more troubleshooting before replacing this component.

Jun 17, 2017 | 2004 Ford Econoline

1 Answer

When I turn on the heater or defroster, the left side vents blow cool air while the right side vents blow hot air. what could the problem be?


there is 2 electronic damper controls for driver and passenger heat and cool controls directly in the middle of the car under the dash near the floor. They move the damper for temperature control up and down when you slide the switch. One of them probably got stuck or just died. same thing happened to me but mine was just stuck and I had to free it up. hope this helps

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There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

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Only hot air blows out vent when switch is in cold or blue area even when ac is on


Could also be that you are out of Freon, Compress may have a leak. Try it on cold setting in the early morning if its not even cool and heats up fast then Rob is correct. ITs a damper/ temp problem which is eternal. You can tear apart you dash and check on the damper (looks like a doggie door) make sure nothing is in the way and the hinger isnt broken.....I hope you can fix it yourself..

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1 Answer

No air flow through the rear vents with ac or heat on high


make sure the control knob on the dash is on "RR". This lets the driver control all the vents in the back. The heat only comes out of the floor vents, if you have the knob on the blue dots that represents the air conditioning in which the cool air will come out of the vents up above in the back. There is also an area on the control knob on the dash where you can turn the knob to shut the heat and air conditioning off. If the knob is in this position then you can control everything with the knob up above the seat right behind the driver's seat.

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