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Old 07-31-2013, 12:14 AM   #1
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Dash Air Conditioner Conversion

So my dash air is not blowing cold any longer, I guess I have to convert over to the newer fluid. Any suggestions if this is a DIY project or should I take it to a professional? Anyone have experience with the costs and what's needed?
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Old 07-31-2013, 03:29 AM   #2
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What year is your rv? If newer than 96 than most likely already set for R134. If newer than about 87 than less is required. Beware of kits you buy at your local parts store. If not done right you can damage entire system. If your mh is set for R12, then as a minimum you need to flush the system, install new dryer, drain the compressor of oil then install new Ester oil and needed freon. I suggest a new flat wound condenser. The new condenser will improve ac performance as R134 is less reactive than R12. Yes, all do it yourself with the needed tools, guages, flush gun and vacuum pump.
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Old 07-31-2013, 05:57 AM   #3
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AND change every seal as R-134 is not good for the old R-12 seals...
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Old 07-31-2013, 09:08 AM   #4
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The conversion requires you evacuate the system, plus the odds are you have a leak somewhere and the conversion tech can search for (and perhaps fix) that for you as well.. Though they do sell "Home" kits, this is not really a D-I-Y type of job,I strongly recommend professional help.
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Old 07-31-2013, 11:28 AM   #5
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I am going to make this recommendation without knowing where you are or the age of the coach.

Look up HC-12a. It is a very effective and environmentally friendly refrigerant. There is just one problem, the EPA doesn't like it and some states have made rules to prohibit its use in homes and cars. This is mostly because it can't be patented and so no body gets any royalty with the sale. It is cheaper than R-134a. It is compatible with everything in common use. No seals, gaskets or oil need be changed out.

It will support combustion as it is largely propane.
R-134a will also support combustion, but as it is halogenated, it will produce toxic gasses if burned.

I have been using this for six years now and it works better than R-134a, but it is a little more difficult to judge the charge level than is was when I serviced R-12 equipment.

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Old 07-31-2013, 04:19 PM   #6
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Quote:
Originally Posted by MattC View Post
I am going to make this recommendation without knowing where you are or the age of the coach.

Look up HC-12a. It is a very effective and environmentally friendly refrigerant. There is just one problem, the EPA doesn't like it and some states have made rules to prohibit its use in homes and cars. This is mostly because it can't be patented and so no body gets any royalty with the sale. It is cheaper than R-134a. It is compatible with everything in common use. No seals, gaskets or oil need be changed out.

It will support combustion as it is largely propane.
R-134a will also support combustion, but as it is halogenated, it will produce toxic gasses if burned.

I have been using this for six years now and it works better than R-134a, but it is a little more difficult to judge the charge level than is was when I serviced R-12 equipment.

Matt

The big reason its prohibited is because its flammable if you have a accident it can act like a blow torch from a cracked line or even explode its propane, if you turn on your gas grill a few seconds and then light it you have a small explosion now multiply that by 3 pounds of liquid propane "don't use it" People started using it when r12 was being phased out and it didn't take long for then to prohibit it because of the risk. One other thing if you do use it and then take your unit somewhere to be worked on when they recover the coolant with their machine it will contaminate the storage tank they use and you could be charged for all of the contaminated Freon. Just upgrade your unit with 134A.
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Old 07-31-2013, 05:38 PM   #7
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If you go to R134A, you will also need to flush the oil out of the system and install a PAG or POE oil to be compatible with the refrigerant.

As suggested get one of the drop in blends such as "Hot Shot" (trade name). All you need to do is fix any leaks, evacuate the system and recharge with the blend. Oil, hoses, and seals are all compatibles with the drop in blend.

You will get some "experts" telling you to just blow off the pressure and recharge with R134A...not the way to do it. It is short term fix and will wind up a problem later.

Ken
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Old 08-01-2013, 12:23 AM   #8
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R134 molecule is smaller and passes through the hoses, proper upgrade requires all rubber to be changed.

Ours had rubber hose end to end, not good.

Our commercial HVAC vendor suggested hot shot as direct replacement, works great
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