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Old 06-15-2016, 10:23 AM   #15
2 Rivet Member
1996 30' Cutter Bus
Lawrenceville , New Jersey
Join Date: Dec 2015
Posts: 30
Hi all,

SpletKay06: this is not a converted system. See below.

drboyd: I'm such a dumbass! I never thought of looking for a model number! It's a Sanden 4653. It has 134a on the label. It also has "Ford" on the label. But the entire system is still built by "Acme". At least that's what it says in my motorhome's Owner's Handbook. The Handbook says nothing about the dash air conditioning except to contact Acme.

mayco: I've seen One of the first things I did was email them. No response. I emailed them again. No response.

So I found the service guide for the compressor, but it says nothing about the ports. I could find nothing else online. I'll go back to the auto part stores. Maybe they can help me now.

To reiterate: I've had the schrader core on the low pressure side out and it had no pressure at all. I can't check the high pressure side because it doesn't have a schrader valve; it has some kind of ball valve, and the guages won't work on it. I also found that these ball valves are very prone to leaking. A few people stated that after disturbing them only a couple of times, they will leak. Some have said that they can be replaced with a schrader valve, so that is what I'm trying to do. I don't want to add expensive coolant for the sake of a valve that costs of few dollars. But I can't find it!

One more thing: when you turn on the air conditioner, the clutch never engages. That, of course, is a symptom of no pressure.

Thanks to all for your input.


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Old 06-15-2016, 01:22 PM   #16
2 Rivet Member
1996 30' Cutter Bus
Lawrenceville , New Jersey
Join Date: Dec 2015
Posts: 30
The other possibility is that this is a schrader valve after all, but the threads have been stripped out by someone. Either way, it still has to be replaced.

I've been to auto stores again, and knowing the compressor doesn't help. The valves are part of the Acme designed system, not part of the compressor. I even went to an auto air conditioner shop, but he was no help. He just kept insisting I bring it in. If I wanted to just take it somewhere, I wouldn't even be on this forum. I'm trying to fix it myself. Taking it somewhere will be my last resort. I'm not there yet.

So my next move is to remove the part and then try to match it.


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Old 06-15-2016, 01:47 PM   #17
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bkahler's Avatar

1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 7,722

Have you tried calling Acme Air? I was trying to locate some vacuum servos and tried emailing them several times and finally tried calling. I think I left a message and he eventually returned my call. I think Acme Air is a sideline business so he may not devote a lot of time to it. This was several years ago so things may have changed.

You can 913-515-1560 with any questions, his name is Richard.

Good luck!

Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
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Old 06-16-2016, 01:59 PM   #18
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2009 27' FB Flying Cloud
1991 35' Airstream 350
Jay , Oklahoma
Join Date: Oct 2006
Posts: 1,689
I am just kinda getting up to speed on automotive A/C myself, so I may be off base here but:

The valve you post the pic of should not leak, as one can close the service valve under the black cap in the pic.

To my knowledge this keeps the ball valve from leaking by effectively shutting it off with another valve.


Jeff & Cindy
'09 27FB Flying Cloud
'91 350 LE MH
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Old 06-17-2016, 05:40 PM   #19
2 Rivet Member
1996 30' Cutter Bus
Lawrenceville , New Jersey
Join Date: Dec 2015
Posts: 30
Hi all,

JD: I did remove the plastic caps, and it is another valve (see "1" in the picture). They were impossible to move. Just frozen. And even if I could turn these, my issue is still the same: I can't get a set of guages on these when the guages are meant for schrader valves.

So I still wanted to remove the whole valve assembly and then see if I could match it or replace it with something with schrader valves. So I put a wrench on "2" in the picture, and ...

... with little effort ...

... it snapped clean off (see "3" in the picture).

So now I have a bigger mess.

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Old 06-17-2016, 06:23 PM   #20
4 Rivet Member
1991 25' Excella
Stanfield , Oregon
Join Date: May 2016
Posts: 317
That valve #1 is so you can remove the compressor without venting the whole system it's probably never been used. Even though its not a converted system the fitting should be swappable. Changed them often when I did ac professionally.

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