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Old 05-08-2016, 05:29 PM   #1
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Help airco problem Chevy Express 3500 V8

Hi you all
I have a weird problem
My blower motor of my airco the my chevy express 3500 2005 (v8 6 liter )
Is running but when i want to change it only to the front VENTS it would not run in the vents , it coming from below where my feet are also where the defrost of the windshield is but not blowing on the vents outlets where its blowing in your face or at your body
The blower mother is running at different speeds so not problem there but i can not redirect the air flow ,
Since this on the ac is working ok (its getting cool enough at my feet ) but that not where i want it , strange thing i looked and looked can not find it.
Also i can not find meaby a fuse that can cause this.

Can some one tell me how i can solve this , and meaby explain how the front selectors are working electric or.......and how does its select the way of the air flow?
and where are the those flaps or switches located (i have no idea)

Its a thor motor home 2005 chevy express 3500 v8 6 liter engine

H E L P
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Old 05-09-2016, 10:49 AM   #2
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The doors or flaps in your HVAC system are powered by engine vacuum. If all vacuum is lost, the air is diverted to the defroster vents. I'd check all vacuum lines to be sure they are intact and not leaking.
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Old 05-09-2016, 11:29 AM   #3
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The doors or flaps in your HVAC system are powered by engine vacuum. If all vacuum is lost, the air is diverted to the defroster vents. I'd check all vacuum lines to be sure they are intact and not leaking.
My brother in laws already had to be replaced on his 2006 Class A....
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Old 06-05-2016, 01:20 PM   #4
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The doors or flaps in your HVAC system are powered by engine vacuum. If all vacuum is lost, the air is diverted to the defroster vents. I'd check all vacuum lines to be sure they are intact and not leaking.
Thanks
But i found a loose line but have no idea where its should be attached
I wish i had a pic where all those line go
ANY TOUGHTS?
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Old 06-05-2016, 01:36 PM   #5
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It's pretty crowded under the dash of a van or Class C, you might want to spend the money and have a pro look at it. If you can, you could try checking each 'biscuit' type vacuum motor and make sure it's vacuum line is connected. Perhaps if you stick a golf tee in the open line, the other doors will open and close properly and you can figure out which one isn't working, the routing for the mystery hose.
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Old 06-05-2016, 06:15 PM   #6
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It's pretty crowded under the dash of a van or Class C, you might want to spend the money and have a pro look at it. If you can, you could try checking each 'biscuit' type vacuum motor and make sure it's vacuum line is connected. Perhaps if you stick a golf tee in the open line, the other doors will open and close properly and you can figure out which one isn't working, the routing for the mystery hose.
Thanks but its not under the dash it in motor compartment
And i really have no glue where it should be attached.
By close the hose is not solved the problem since it does not produce vacuum ,

I am really puzzeled about this ,and since i am in europe no body knows about USA Motorhomes or vehicles
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Old 06-05-2016, 07:19 PM   #7
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Vacuum is produced by the intake manifold. There should be a hose attached at the manifold that goes to the brake booster, located behind the master cylinder. The vacuum lines then branch off that main trunk. A vacuum reservoir, usually a round black plastic tank or perhaps shaped like an egg container stores vacuum when the engine isn't producing it. (full throttle) is also connected to that trunk, then smaller hoses go to the dash HVAC control panel. You should be able to detect vacuum at least at the brake booster. If you have open connections, it could cause a lean condition in the engine and isn't good for engine health.

Google has various diagrams for vacuum hoses:

https://www.google.com/search?q=vacu...h-Drwmz2w4M%3A
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Old 06-06-2016, 09:41 AM   #8
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Vacuum is produced by the intake manifold. There should be a hose attached at the manifold that goes to the brake booster, located behind the master cylinder. The vacuum lines then branch off that main trunk. A vacuum reservoir, usually a round black plastic tank or perhaps shaped like an egg container stores vacuum when the engine isn't producing it. (full throttle) is also connected to that trunk, then smaller hoses go to the dash HVAC control panel. You should be able to detect vacuum at least at the brake booster. If you have open connections, it could cause a lean condition in the engine and isn't good for engine health.

Google has various diagrams for vacuum hoses:

https://www.google.com/search?q=vacu...h-Drwmz2w4M%3A



Ok thank you all
For the record problem solved , there was a connection half way the right side of the engine on the valve hood
engine 2005 v8 6 liter
(since i have LPG on my engine ( i live in europe) it was covered by the lpg injectors that was fitted on top of it , so was hard to see that inlet socket)
regards
Cees
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Old 06-10-2016, 09:54 PM   #9
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I am really puzzeled about this ,and since i am in europe no body knows about USA Motorhomes or vehicles
In the menu bar at the top, to the far left, is User CP, if you click on that, then on the LH side you will see a column titled Your Control Panel. The very top item in that is a clickable link Edit Your Details. Scroll to the bottom of this screen and you will find Location City, State. type your location in this box, (Europe, or France, or Paris, or wherever you happen to be) and hit the save button at the bottom, this will display below your User ID on the LH side of your post. This will help everyone out immensely when trying to provide you with information.

Charles
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