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Charging the Auto AC on my 1989 Ford Class C RV
2545 Posts
July 5, 2013 – 10:45 pm

On the way to my last camping trip I was running the AC while driving from the regular van AC unit on the motor.  On the return trip I put the AC on and nothing but hot air. :tickedoff:  Now my RV is a 1989 so it originally had R12 in it….. but I just happened to notice a sticker when I was checking the oil and water before I left for my trip that said it was converted to 134A. 

I stopped at Harbor Freight and picked up a can of Artic Freeze 134A Refrigerant for $25.  It was an 18 ounce can with the hose and a pressure gauge.  The 12 ounce cans without the gauge were $15 I think.  You are supposed to attach the hose to the Low Pressure side of the AC compressor to charge it.  As soon as I popped the hood I saw an easy access AC line with a fitting…..perfect  :cheerleader:  Only it turned out to good to be true.  That was the High Pressure side.  After following the lines a little bit I noticed it was shoved way back under the hood near the doghouse on the engine side behind the air filter. :'( 

I had to take off the air filter assembly, a few hoses, and a bracket to give me a little more room to access it.  Key word LITTLE.  So I hooked everything up, turned the AC on and started charging.  It took the full 18 ounces and still was not in the proper area for a full charge.  I checked the interior temperature and it was cooler, but I have a feeling I need to add more or I have a larger problem.  I’ll see if I can get another can of 134A and charge it up a bit more.  If it turns out I have a larger problem, I’ll just have to do a Roll 60……roll down the windows and do 60mph  :lmao:

The can of stuff
[img width=640 height=477][/img]

Why couldn’t this be the fitting I need?  It is so easily accessible.
[img width=640 height=477][/img]

Basically the Low Pressure fitting is in the center behind the air filter against the doghouse.
[img width=640 height=477][/img]

Air filter assembly out of the way, now to take the bracket off.
[img width=640 height=477][/img]

There it is.  You can see a little "L" printed on the cap.  Plus it is on the fatter line coming off of the compressor.

[img width=640 height=477][/img]

Matt O 2006 Skyline Nomad 27′ travel trailer.  Previously owned 1986 Coleman Columbia / 1992 Coleman Senecca / 1989 Born Free Class C RV.

420 Posts
July 6, 2013 – 11:05 am

With hoses and fittings that old, you probably have a leak somewhere. hopefully it is a simple fix.

Best Regards,

600 Posts
July 6, 2013 – 4:29 pm

I would try and retro fit it so you can access it from the inside by removing the console cover.

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