94 AC System in a 92
Record Breaker
Joined: Nov 2015
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From: North Carolina
Replace your lines. Refrigerant tends to seep through lines anyway and fire damage will make them leak like a sieve. This will be the time to convert to R-134. The number refers to the size of the molecule. R-12 is less likely to leak because it's a bigger molecule. R-134 is much smaller and finds smaller pores to seep through.
Flush the system and replace the mineral oil with PAG oil. You'll need a conversion kit but you'll then have R-134 system.
Flush the system and replace the mineral oil with PAG oil. You'll need a conversion kit but you'll then have R-134 system.
Administrator
Joined: Apr 2010
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From: Clayton MI
Yeah, there are adapters that go on the pressure taps.... and the fill as well, but, the typical kit comes with all of that stuff.
Grand Champion
Joined: May 2019
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From: S.W. Indiana
R-12 is no longer available. At least not any I'd trust. The Dakota and all of Chrysler went with R-134 in 1994. I've known guys, who I won't let touch my equipment, who just pump it down and dump R-134 into the system and put the adapters on the fill ports. While you're replacing the hoses, replace your receiver/dryer at the same time, flush everything with a kit off Ebay for $50-75 and get all the mineral oil out. Replace it with PAG oil as the two do NOT play well together. The kit will have the fittings. Keep in mind, if you use a manifold gauge set, they are different for R-12 and R-134.
Record Breaker
Joined: Nov 2015
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From: North Carolina
Good information, fellas. I think my 1993 Dakota was the very last vehicle ever made with R12. I did find tubes on ebay so that shouldn't be a problem. I haven't found a conversion kit yet but I haven't looked very hard.
Record Breaker
Joined: Nov 2015
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From: North Carolina
OK, like I said I can get the tubes easily. But is there a specific conversion kit unique to a 1993 Dodge Dakota 5.2L or are these R12 to R134 conversion kits universal? Be patient with me cuz I've never worked on an automotive AC system except recharging a Jeep with one of those cans you buy at Walmart. And it didn't work because the evaporator had a leak. So you're talking to an AC ignoramus here.
Administrator
Joined: Apr 2010
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From: Clayton MI
Pretty sure they are universal..... If it comes with an orifice tube though, that's gonna make a difference. They are NOT all the same. (though, none of the kits I dealt with had one....)
Record Breaker
Joined: Nov 2015
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From: North Carolina
OK. I think I found one. Grouch mentioned flushing to get the mineral oil out and to use PAG. The conversion kit comes with ester. Is that the same thing?
(back in the late 90's??? )