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Old 09-10-2016, 03:47 PM   #1
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Dash A/C not working Diesel pusher

Has anyone tried to recharge dash air conditioner in a pusher?
I've put in "plenty" of 134 but still no cool. Pressure will rise but after a minute or less drops back to 0. The compressor is 40' from the dash unit so it seems to me perhaps a "lot" of 134 is needed
Any thoughts?

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Old 09-10-2016, 03:59 PM   #2
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Probably have a leak, I'd put in a can with the UV dye in it and see if you can identify the problem. Hopefully it will be an easy find but considering how the hoses are routed it could be almost anywhere.

You can buy the light & glasses at Walmart pretty cheap. Look at the connections first in the front, the condenser, and compressor. Also check all around the compressor.

My dash AC quit blowing cold air ~6 years ago, I added 1 can of Freon and that solved the problem. Still blows cold today.

I identified a leak on my older Suburban, turned out to be an O-ring on a plug in the compressor. Drained the system, pulled the plug, put a new O-ring in and put the plug back in, all is good.

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Old 09-10-2016, 04:10 PM   #3
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My 1999 36' Country Coach specs were for 5 pounds of 134a Freon.

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Old 09-10-2016, 04:38 PM   #4
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Is the compressor running at all times? At zero pressure it shouldn't.
My A/C takes about 5 to 6 pounds for a complete fill.
Are you reading both the high and low side?
If you are reading pressure on the high side an no pressure on the low side you have some blockage.
Has anyone ever used a sealer for the A/C? This can cause blockage.
A/C dryer coming apart? This can cause blockage.
You need more refrigerant and have a leak. Can't find a leak until the system is charged. Look at this chart to get you close
R-134a System Pressure Chart | AC Pro

A/C is complicated, you might want to have an expert look the system over.
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Old 09-10-2016, 04:40 PM   #5
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Originally Posted by 05Journey View Post
Has anyone tried to recharge dash air conditioner in a pusher?
I've put in "plenty" of 134 but still no cool. Pressure will rise but after a minute or less drops back to 0. The compressor is 40' from the dash unit so it seems to me perhaps a "lot" of 134 is needed
Any thoughts?
First off, what kind of history are we looking at here? Have you had the coach long? If so, has the dash air been working as it should, getting cold? If it was, but now it's not, yeah, I'd suspect a developed leak. Or, did you just buy the coach and don't know anything about the dash A/C system?

I'd just about guarantee a leak due to the fact that you put 134 in it and, it goes up but, drops right back to zero. I'd maybe start at the compressor and work towards the dash inspecting for leaks. There's oil in those systems and, if it's leaking that bad, you'd more than likely notice some fresh oil seeping out of where the leak might be. Good luck and report what you've found out so that others may learn.
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Old 09-10-2016, 09:35 PM   #6
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Pressurize the system with the engine off. If it is not a gauge problem you should hear the noise of the escaping pressure since it sounds like a large leak.
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Old 09-11-2016, 07:09 AM   #7
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There are many places a leak may occur. this includes the compressor seal, access fittings and connections anywhere. There may be a leak in the condenser or in the evaporator. Dye is nice if the leak is in a visible area but the only sure way to isolate the leak is with a leak detector. they can be found by google search from walmart to harbor freight.

When I fixed mine it was the filter accumulator that was clogged. Pressure on the high side but not on the expansion valve. Follow some of the advise already given.
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Old 09-11-2016, 09:54 AM   #8
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Leak down that fast will be heard.

Look for either an old recharge hose or fitting that fits but an old hose is best.

Add fittings to that hose to allow you to connect it to your Ari compressor and connect it to charge the system.

Turn it to max pressure and place it as far away as possible.

Get young ears to help as they hear better as well as a garden sprayer filled with dawn mixed strong.

Listen spray and look for bubbles and fix what leaks.

Gently tug hoses and fittings as o - rings fail and if it was R12 and converter to r-134 they may be not compatible and failed.

After all fixed charge with air but have a manifold in place so you can turn air off at manifold and have gages present.

Write readings down and check daily and if it holds then evacuation and charge as needed.

If leak was major assume you lost oil and for good cause maybe drain compressor and replace dryers then start from scratch to be sure proper amounts of correct stuff.
Tony & Lori
1989 Country Coach Savannah SE
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Old 09-11-2016, 10:07 AM   #9
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Originally Posted by 05Journey View Post
Has anyone tried to recharge dash air conditioner in a pusher?
I've put in "plenty" of 134 but still no cool. Pressure will rise but after a minute or less drops back to 0. The compressor is 40' from the dash unit so it seems to me perhaps a "lot" of 134 is needed
Any thoughts?
Yes, I replaced the compressor and the two dryers and vacuumed the system.

The fill required 7+ 12oz cans of 134a or about 5.5 lbs to refill.

Borrow a set of gauges from Auto Zone to do it right.

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C8.3L 300hp Cummins, 31,000lbs
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