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Old 04-20-2017, 12:12 PM   #1
WildMatt84
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Any thoughts on why an AC would blow cold through the defroster but not through anything else? 2008 Ram 1500
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Old 04-20-2017, 12:13 PM   #2
6.5 shooter
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Doors usually break in the HVAC plenum. Requires a full dash removal.
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Old 04-20-2017, 12:27 PM   #3
orlybow
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The wire linkage rod that controls the plenum door probably came off. Just look for it under your dash and re-attach it.
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Old 04-20-2017, 01:56 PM   #4
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Old 04-20-2017, 02:27 PM   #5
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These guys are on the right track. Does it not blow at all through any of the other vents? Does it make a knocking noise in the dash when you start the truck and/or turn on the air?
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Old 04-20-2017, 02:33 PM   #6
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Very possibly could have had a blend motor go out, if there is a popping grinding sound when you try to switch the air flow that would be my guess as Ive replaced severla on chevy's and dodge over the years
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Old 04-20-2017, 02:43 PM   #7
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Might be the recirculating door fell on top of your fan.

Take your glove box door off
Take the fan off
See if the door fell on the opening
If it fell on top of the fan pull the door through the hole
*your recirculator function with your truck won't work anymore but the AC and heater will still work.
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Old 04-20-2017, 03:22 PM   #8
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Quote:
Originally Posted by KDinTX View Post
Very possibly could have had a blend motor go out, if there is a popping grinding sound when you try to switch the air flow that would be my guess as Ive replaced severla on chevy's and dodge over the years
had this happen on an expedition too
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Old 04-20-2017, 04:46 PM   #9
dustoffer
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Quote:
Originally Posted by 6.5 shooter View Post
Doors usually break in the HVAC plenum. Requires a full dash removal.
Was having a similar problem with the plenum door on wife's 2010 Chevy SUV and my mechanic quoted me $1500 to fix it due to the dash disassembly. He said "Trust Me" and did a redneck fix for $75.
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Old 04-20-2017, 09:20 PM   #10
WildMatt84
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Blows through all vents but not hard and not cold. No grinding
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Old 04-20-2017, 09:23 PM   #11
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When the AC defaults to the defrost vents, I usually start looking for a vacuum leak.

I had a cracked hose to my vacuum pump and it couldn't build up enough pressure to move the blender door. Evidently the default is defrost. Simple fix for me. Locating the leak is the big thing.
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Old 04-20-2017, 09:34 PM   #12
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It's the blend door mine has stick holding it up. You can cut all the grill away and remove or go ahead and replace the door. It is behind the glove box like stated above.
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Old 04-21-2017, 06:05 AM   #13
Radar
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Blend door. There is a blend door repair kit available, no longer requires taking complete dash out. Youtube is your friend
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Old 04-21-2017, 08:25 AM   #14
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Quote:
Originally Posted by Smart View Post
When the AC defaults to the defrost vents, I usually start looking for a vacuum leak.

I had a cracked hose to my vacuum pump and it couldn't build up enough pressure to move the blender door. Evidently the default is defrost. Simple fix for me. Locating the leak is the big thing.


This is where I would start looking also


Sent from my iPad using Tapatalk
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Old 04-21-2017, 09:02 AM   #15
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Quote:
Originally Posted by dustoffer View Post
Was having a similar problem with the plenum door on wife's 2010 Chevy SUV and my mechanic quoted me $1500 to fix it due to the dash disassembly. He said "Trust Me" and did a redneck fix for $75.
Have 2 friends that have had a similar problem. (air would blow out the defrost vent but wouldn't switch to blow out front vents even though you could hear it blowing)They both fixed it by removing the 3 bolts from the fan motor( on the passenger side , under the dash, no need to remove the dash) reaching up and pulling the plastic diverter out by hand. Took them less than 5 minutes and problem fixed.
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