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09-18-2013, 06:20 PM
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#1
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Junior Member
Join Date: Sep 2013
Posts: 2
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A/C mystery
My P32 A/C shuts off the dash fan at the slightest application of the accelerator, or if the ambient temperature exceeds 101F.
Where can I get a wiring diagram?
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09-18-2013, 06:36 PM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,269
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Sorry your having problems.
What year is your coach ? Can you see any brand name tags on the a/c housing anywhere ( Acme , Denso and Evans ) are common. Sounds like you are loosing vacuum between the engine and the A/C control head.
First place to check would be all vacuum hose connections on the intake manifold.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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09-18-2013, 06:41 PM
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#3
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Senior Member
Winnebago Owners Club
Join Date: Nov 2012
Location: Cobble Hill, B.C.
Posts: 1,283
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Is it shutting off the dash air or is it changing to defrost (default)?. If it is changing to defrost ports, it sounds like a vacuum leak. I had this issue on my pickup and replaced a small broken hose and all is fine now
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Steve and Sheri with Archie (and Hiro, R.I.P.)
2000 Winnebago 35U, Ford F53/6.8l V10
F150 Ford and Vintage Aspencade.
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09-18-2013, 07:03 PM
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#4
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,942
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If on a gasser chassis, start looking f'or a vacuum leak or Bad check valve.
Usually you will see or feel a change in the air flow from the dash vents.
Ken
__________________
Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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09-18-2013, 07:25 PM
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#5
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Member
Winnebago Owners Club
Join Date: May 2012
Posts: 67
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As per the previous posting it is generally a vacuum leak. Easy method to ID this is check for air flow at the defrost and floor outlets. The default postion for the air flow doors with no vacuum is on the floor and defrost.
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"We meet, We part, Till we meet again"
2007 Winnebago Tour TD
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09-19-2013, 07:01 AM
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#6
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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I'll bet the fan is still running, the rig has a vacuum leak and when you hit the gas (Which drops engine vacuum to near zero) It switches to defrost (The default setting) so you no longer feel the blow... Others have described what to do next.
NOTE: I had this happen in a car twice.
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Home is where I park it!
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09-19-2013, 07:58 AM
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#7
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Senior Member
Winnebago Owners Club
Join Date: Jun 2011
Location: Amite, La.
Posts: 289
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It could be a stuck check valve on your vacuum pump at canister .
Good luck,
James
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09-19-2013, 12:02 PM
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#8
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Junior Member
Join Date: Sep 2013
Posts: 2
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Question number 2.
Why does A/C air flow shut off if the Ambient temperature is over 101, even idling with engine temperature normal?
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09-19-2013, 12:18 PM
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#9
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Senior Member
Winnebago Owners Club
Join Date: Jun 2011
Location: Amite, La.
Posts: 289
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The vacuum controlled air mixing door is operated by vacuum , when you accelerate you loose vacuum to canister due to bad check valve and it blows warm to hot air out if vents.
The engine requires vacuum from canister also the more you accelerate the more vacuum is required thus robbing A/C control doors of vacuum.
Hope this helps, IIRC
James
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09-19-2013, 08:55 PM
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#10
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,269
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Quote:
Originally Posted by obenskik
Question number 2.
Why does A/C air flow shut off if the Ambient temperature is over 101, even idling with engine temperature normal?
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That's an odd one, but if you get the " under load " problem fixed, I'll bet that goes with it.
Should have asked this in my, first reply .
Is this a new problem or a problem on a new to you coach ?
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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09-19-2013, 09:26 PM
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#11
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Jun 2008
Location: Glendora Ca.
Posts: 1,584
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That coud be the "high pressure" cut off because of a lack of cooling at condenser.
Mike
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2004 Monaco Monarch
Blueox, SMI, 1990 Wrangler YJ
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09-20-2013, 11:41 AM
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#12
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,269
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Quote:
Originally Posted by mfire1339
That coud be the "high pressure" cut off because of a lack of cooling at condenser.
Mike
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Good info, Mike , just goes to show you what 6 years of retirement will do.
You forget all kinds of important stuff. High pressure shut down, possibly due to, system over charged with Freon, or poor rad fan operation. I'll scratch my head for other possibilities.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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09-21-2013, 11:37 AM
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#13
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,269
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Your A/C's Freon system , has low & high pressure cut out switches to protect the compressor, from running out of Freon ( low ) or stalling because of back pressure ( high ). If someone has added Freon to the system ; without measuring the pressure during the top up, the system will shut down to avoid over pressurizing and bursting at the seams.
High pressure cut out , would be most common at high ambient temps, because the pressure cannot be controlled by the cooling at the condenser .
If you get the mode change under acceleration fixed and still have the , high ambient temp problem. You will have to have the operating pressures of the system tested and some Freon removed or the high pressure cut out switch replaced.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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