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Old 09-01-2013, 02:58 PM   #1
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chassis air not cool

I have a 03 Winnebago Adventure on a 8.1 workhorse chasse.no cool air are from dash a/c.tried to charge it but compressor just runs and shuts off and runs and shuts off.anyone have an idea what it could be?
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Old 09-01-2013, 05:42 PM   #2
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Usually when a compressor cycles like that it is low on Freon, there are low pressure switch's and high pressure switch's that can shut the compressor down, yours sounds like low Freon.
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Old 09-01-2013, 07:48 PM   #3
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it will not take the Freon just cycles off then comes back on???
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Old 09-01-2013, 07:56 PM   #4
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Quote:
Originally Posted by hondaman View Post
it will not take the Freon just cycles off then comes back on???
I would put a set of gauges and find out what the pressures actually are compared to manufactures specs. The pressure might be too high.
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Old 09-01-2013, 09:06 PM   #5
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If it has not been worked on how could the pressure be to high. Sounds like you might be trying to add to the wrong port or your tool to add freon might not be set up right.
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Old 09-01-2013, 09:27 PM   #6
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If it's 134A, the fittings are different for high and low side.

Try spraying cool water in the radiator and raise the idle to about 15-1700.
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Old 09-02-2013, 08:19 AM   #7
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And 134A IS ALSO NOT freon.

One question and the reason for it.. Is this a "New to you" RV?

The major issue with many RV's is all that windshield.. I mean you are sitting in a greenhouse.. That Dash A/C is designed to cool the cab of something like a Ford F-350 Pick up or a Chevy 30, To cool an RV is way, way, way beyond it's ability and when you add all that blasted Greenhouse glass... NO WAY will it work.

I have a thermomemter stick so the sensor tip (it's the kind they use to check Air Conditioners) is in the air flow to one of the dash vents (Stuck it right through the hose)

IT shows the A/C working perfectly.. But I'd be hard pressed to say I can feel it working.
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Old 09-02-2013, 08:41 AM   #8
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If you read this link may find what is going on with your dash poor cooling.
You can buy new Evans control valve or add a ball valve in one of the heater hoses.
Its the same problem in a gas or DP coach.
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Old 09-02-2013, 09:54 AM   #9
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yes it is new to me.it is blowing out warm air.
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Old 09-09-2013, 03:56 PM   #10
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I believe palehores89 is correct. If you can find the low pressure switch you could disconnect wire and jumper across to keep compressor engaged while adding freon or bring the engine idle speed up around 1200-1500 while adding freon.
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Old 09-09-2013, 04:09 PM   #11
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If it is a bad dash air, you'll probably find you can run the genny quite a while, and stay a lot cooler for the $ you would spend fixing dash air.
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Old 09-09-2013, 04:23 PM   #12
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Try your cool control to defrost to see if it is still hot air.

It should have taken a charge as long as the clutch is engaged .

You may want to put gauges on it and check pressures.

Hope this helps,

James
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Old 09-09-2013, 04:35 PM   #13
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Sometimes the valve which shuts down the hot air from the heater leaks hot air. I added a second valve to the other side of the heater core and it stopped it. 3M also makes a clear film for the inside of the windshield which rejects 99% of the heat. I put a film on that rejects 70%, before they had a 99% and it is amazing.
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Old 09-10-2013, 02:04 PM   #14
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Leave the refrigerant can hooked up and open, A/C on max; the short-cycling will slowly improve as the system pulls in refrigerant. Hold the can upside-down during the short-cycling for faster fill to add liquid, turn can right-side-up after the short-cycling stops to prevent a potential compressor failure. Your fill hose does have a gauge incorporated to prevent over-fililing, right?
That's my method, use at your risk.
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