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Old 03-10-2009, 11:14 AM   #1
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Possible A/C - Vent issue... Insights?

Issue cropped up this weekend while camping.

Pulled into the spot. As I was maneuvering to find the optimal spot I had the vent on (dash vents) to cool off. I leave the engine running as I leveled, put the slides out, etc. When I switched off the engine, a "hiss" or more like very low "AM radio static" sound came from under the dashboard... on the left side, where the back-up camera speaker resides. I checked the volume on the rear camera monitor, it was all the way down/off. The static sound remained for a few minutes and then fell off linear until we could not hear it anymore.

Additional tid-bit: I notice my fan(a/c compressor?) for the vent - A/C comes on every once-and-a-while while driving and the vent A/C is not "on".

Any help/insights would be appreciated!

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2007 Itasca Meridian 36G Freightliner XC w/ Cat C-7
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Old 03-10-2009, 11:51 AM   #2
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It sounds like you have a vacuum leak somewhere. The doors that divert the air to the floor , dash vents and defroster are all vacuum operated. I think I read that most DP have an electric vacuum pump either under the dash or in a front compartment. If you can hear it try turning just the key on (don't start the engine) and listen for it . It should shut off shortly. Try moving from vent to floor and see if anything happens. You most likely have a hose that is cracked or one that came off the backside of the dash contol. Hope this helps!
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Old 03-10-2009, 08:29 PM   #3
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jeepfreak -
You confirmed my assumption... I will have to take the dashboard apart and dig around. Thank you for the response.

I do know the hiss is in the dash; I popped the front cover above my gen and there was absolutely no noise. So it's contained to the dash... which makes it easier.

Thanks!
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Old 03-11-2009, 01:03 PM   #4
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Before you take the dash apart check the short piece of hose on the heater control valve make sure it is not split,had seen several units with this problem
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Old 03-11-2009, 05:11 PM   #5
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NO1RAINH20:
Thanks for the tip!

Where would I find the heater control valve hose?
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Old 03-11-2009, 06:10 PM   #6
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Heater Control Valve

Quote:
Originally Posted by luckymick View Post
NO1RAINH20:
Thanks for the tip!

Where would I find the heater control valve hose?

luckymick, try this picture. On the right side is the Heater Control Valve which is connected to a heater hose ( top and bottom ). It has a small green vacuume hose connected to it. This is the problem area where you may find the leak.

http://www.irv2.com/photopost/data/2...ir_w_notes.JPG
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Old 03-11-2009, 06:30 PM   #7
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Thanks sammie!
Althought the leak noise is coming directly in the area of the speaker for the rear camera. I did not hear any noise in the front compartment (you're picture).

I will check... hopefully tomorrow!

Thanks!
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Old 03-11-2009, 06:51 PM   #8
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Quote:
Originally Posted by Sammie View Post
luckymick, try this picture. On the right side is the Heater Control Valve which is connected to a heater hose ( top and bottom ). It has a small green vacuume hose connected to it. This is the problem area where you may find the leak.

http://www.irv2.com/photopost/data/2...ir_w_notes.JPG
Thats what fixed mine. I replaced both blue and green with rubber line instead of plastic. Works great
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