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Cab air conditioner question

L

Lew Best

Member
Hey guys

I don't know if this should be here or on Today's Tractors list but here goes. :)

I made a deal yesterday on a 1976 Ford 9600 with air conditioner not working. It hasn’t been delivered yet but I’m trying to get a little info ahead of time. It may be nothing more than the belt (wishful thinking probably) as it don’t have one on it; compressor clutch center turns by hand tho so I don’t think it’s locked up like the guy said he thought it was. I’m familiar enough with automotive type air to fix it but I feel sure it’s an r12 unit; no tag saying it’s been converted to 134.

I’d heard something about this a few years ago; there’s a product called Freeze 12 (& doing a Google search I found another one; Enviro Safe) that supposedly don’t require all the oil changing, etc. that 134 does; you just evacuate the system & put it in (of course if it’s leaked the old out I’ll fix the leak & put a new dryer on it). Anyone ever used either of these products? Looks like they’d be the way to go IF they work satisfactorily.

Input appreciated!

Lew
 

The 134 is easy and cheap to get. I had a JD 4050 switched over to the 134 last year blowing 55 degrees out the vents on a 100 degree day in August.
 

Thanks HD1

Yeah, I converted an old Ford pickup years ago but this stuff costs very little more & sure looks a lot simpler; might even be as cheap by the time you figure the cost of the solvent, new oil, etc. I still have the vacuum tank I rigged up to catch the solvent as I sucked it through the system with the vacuum pump. I'll go the 134 route unless I find positive info (not just the ads) on the other 2.

Lew
 
I would not believe anything a dealer says about
a tractor air conditiner(my experience). Are
you sure the compressor will turn with the
clutch engaged? Can not remember the name of
the product I used. But it was one of those add
to products. It was kind of expensive worked to
a point, but it did not cool down the cab all
that fast or good. Sam's club was having a close
out on R-134 and I bought a tank. Tractor that age I would be thinking new compressor, dryer, R-134,etc. Might save you some hot weather
aggravation. Or else hire a Me...an. Last time
I mentioned that it set off a fire storm here.
My 2 cents.
 

Thanks Cas

I won't really know anything of course until it's here & i put a belt on it & see what happens. I couldn't see the clutch assembly so was checking it by feel but the center of the clutch seemed to turn. The pulley turned real easy but the center seemed to turn with a little more resistance.

I may have a new or rebuilt compressor for it; I did have one before I moved my shop but haven't seen it since (of course I wasn't looking for it either). I found a rebuilt one online for about 130 bux so figure I can fix it without breaking the bank regardless.

I was told on another forum that it's not recommended to flush it if changing compressors; just put ester oil in it & evacuate & put the 134 in (new dryer of course).

Lew
 
We use a lot of Freeze 12 in our older R12 machines and love it. You are right....you don't have to change the oil. I looked on their website to be sure, but couldn't find it. So I called them and one of their techs told me it was compatible. That was 2 summers ago, and it's still working fine. Also, I think the Freeze 12 gets colder than the 134.
 
Freeze 12 on clones are 80% R-134 and the rest is a Freon that will circulate the old mineral oil through the system.

Trouble is, they are azeoptropic mixtures which leak at an uneven rate, meaning that the "good stuff" that carries the mineral oil through the system MAY sneak out b-4 the R-134 does, making for POOR compressor lube and you know what that means!

If you change the dryer and get MOST of the mineral oil out of the system you can then add Polyolester (POE) oil and THEN simply use R-134A.

However, NEVER add polyalkylene glycol (PAG) oil to a system with ANY TRACE of mineral oil (or POE oil left in it. Snotty jello makes for a poorly-working AC!
 

Well, I been working on it off & on; finally got it cooling great today :) :) I ended up using 134; replaced virtually everything except the housings, blowers & switches. I still ended up with what I think is a VERY INEXPENSIVE air conditioned tractor; quite welcome in the Texas heat (they're predicting 100F Saturday & Sunday). Now if we can get rain to make the grass grow my next haying will be lots more comfortable!

Lew
 
(quoted from post at 04:37:25 06/18/10)
Well, I been working on it off & on; finally got it cooling great today :) :) I ended up using 134; replaced virtually everything except the housings, blowers & switches. I still ended up with what I think is a VERY INEXPENSIVE air conditioned tractor; quite welcome in the Texas heat (they're predicting 100F Saturday & Sunday). Now if we can get rain to make the grass grow my next haying will be lots more comfortable!

Lew
Click to expand...

Hope the tractor works out for you, with no major breakdowns.
 
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