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Bob
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Discussion Starter #1
Hi guy's,
It's been awhile,been busy with the new house..
Anyway, I'm taking a break from the house stuff and need to get info on my side project, 1973 Chevy 3/4 ton.
I need to know what refrigerant is in the A/C.. R-12?? R-22?? R-???? :confused: I'm not that proficient with A/C stuff,,
I'm sure it'll need to be recharged, but with what???
As you know it gets hot here in the desert,,need to stay cool,,,:cool:
Thanks,
 

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If you are not that proficient..which I am not either..just have it recharged by one of the local A/C guys..those older ones do need to be resealed with new seals that work with the new refrigerant..

Just my take..

Sam
 

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Save a horse, Ride a Cowboy.
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Originally it had 12.

The best replacement I have found is Duracool. It is legal, cools better than 134 with less pressure, and is fully guaranteed in writing not to ruin your compressor. Check their site. Duracool.com

Stuff like Freeze-12 is a 134 blend and suppose to be a drop-in, and so far I have had 100% failure rate on all 6 that were changed. If you don't flush and add 134 oil.... good bye compressor. I will emphasize that they were NOT NEW compressors, but changeovers.

I have NEVER seen a 134 changeover that would cool at idle or slow driving... Great on the road, but when its 90+ forget it in town.
 

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Home and office air conditioning units use R-22 Freon.
Auto Air used R-12 Freon from the beginning. Manufacturers were required to use the "new" R134A refrigerant beginning in 1996 but some, mostly foreign, chose to change over earlier than that.
The older the system in auto air, the more likely a changeover without major component replacement will be temporary at best. If you are building a car to keep it is best to spend the bucks and change hoses and compressor and drier to make the shift to R134A. If your old system is iffy, belly up for a new custom system like those offered from Vintage Air, Airtique, and others. Sometimes it is best, and can be cheaper, than redoing an old decrepit system.
 

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Bob
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49 Posts
Discussion Starter #5
I'm not going change all the parts to upgrade, this is just my truck I use to haul dirt and gravel, you know, garbage cans to the dump sort of things..
But I would like to get it working, with the stock stuff..
I bought the truck from my son in law,in Washington about 2 years ago, and the belt was missing so I just now put one on,just to see if things worked, the comp. didn't come on,so I jumped the connection on the pressure switch and the comp. came on then. Pushed on the little valve and just barely heard a hiss. So I hope it'll work with a recharge.. If not :(

Thanks again guy's, :thumbup:
 

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Do Your Research

Be Careful. You Need "ounces" To Refill Your System. If You Can Find A Couple Of Cans Of R12 "at A Rummage Sale" Do That. An R134a Upgrade Kit Is Probably $40- Including A New Orifice. I've Heard Of People Using R414b "hotshot". Take It To A "specialist" Sure I Too Think R12 Cools Cooler Than R134 But At What Expense? Wholesale Price For 30 Lbs Of R12 "was" $900. Correct Orifice- Correct System Oil Type- Complete Evacuation- Pressure Testing- Then Correct Filling A Must. Trade A Load Of Stone For Your "a/c Guys" Driveway-but Get "your Truck Done First"- Then Take Him The Stone. Keep On Roddin'
 

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Yeah Im out here, in the Western 1/2 of, the Mojave Desert. In the Peoples Communist Republic , of California . Ive done several R-134 conversion's . This is the first , Ive heard , about older model's not being , compatible with R-134 Refrigerant . The one's Ive done , have worked great . But have been newer 80's+ Car's . Typically you buy these Kitt's, at Wally world , and or a Part's house . The most common Mistakes made , with these Kitt's , is over Pressureing the system . I have one Kitt actually came with a Gauge ? Other kitt's did not come with a Gauge . Typically the Kitt comes with, an adapter injection nozzle , for the Low Side . Note " High side is generally smaller AC hose . This hose can and will burn you , Especially when dealin with R-12 Refrigerant . But with your Kitt Has small Adapter Nozzle Threads coated with Loctite Substance << Mean's one time deal . And Red dye refrigerant, and or red dye sealer refrigerant . Plus 2-3 cans of R-134 refrigerant . A small hose with the can apparatus , and nozzle coupling . Usually No gauge ! <<, Miff's me Why ! <<, suprises me, that more people, arent hurt , chargeing AC's with these Kitt's ? All tho Most People using these Kitt's do Damage there AC system's . Damage Occur's, usually when the novice , over pressurizes the system . <<, Causes leak's etc . But then again, realize that reason your chargeing the System , Is because all the , refrigerant leaked out, too start with ? Commonly , these leak's occur at O- Ring Seal's in the Hoses . <<< reason the kitt, comes with red Dye refrigerant. So Plan on, Buying 2 Kitt's ? Way I do it , Is I Drain the system <<, Per motor's manual's Instruction's . Note ; Some system's Do require Vaccum Pumping ! << Way's around this ? But generally a Leaking System is all ready devoid of R-12 . Like if it has been, Blowin Hot air, past 2 Summers Etc. So after Evacuateing the System of R-12 << Per Motor manual instruction's . You simply install the adapter nozzle , Too the Low side << smaller AC hose . I then Tighten, All fitting's. <<< Alway's Use a Back up wrench , when tightening, AC Fitting's ! There aluminum, soft, and will twist ! Start the motor , turn AC on high . Attach Can too hose << screw's on , then attach coupler too low side/ AKA Big Hose . Small hose is High side . <<, Make sure your on the larger Hose . High side can and will Do really bad thing's Even Hurt , you , Burn You Etc. But after Attacheing every thing, Motor Runnin, warmed up, AC on High . Locate the Sight Glass . << Generally it's a Small Cylinder 1 ft long , Hoses runnin to it . Will have small round Sight Glass on Top, of Fitting's . << As in All set too, Charge . This is where you need too, understand how the cann attachement, apparatus work's . It's a Spike , Like a nail. You twist it in all the way . punctureing the Can . Realize , that as long , as the Spike is twisted in the Can ? That Little or No refrigerant is comming out ! Now Slowly back the Spike handle out . 1/2 turn at a time . Once the spike Come's out of the Hole it made in the Cann . Bamm ! Cann empty's in under a Second ! Reache's extremely high, and Dangerous pressure's . Generally Causeing your System too Leak . So Back too, understanding How Spike , in the cann work's . The Idea here is , too Charge , the system , as slowly , as Possible ? So as not too Over pressurize the System . << Gauges help !!!!! But if Slow and Carefull Can be done with out Gauges ! I Feel the can as I back the Spike out . Minute I feel , Refrigerant moving ? I twist the spike back in 2 Turns . Lett Motor Runn few Second's . Observe the AC compressor Clutch . Useing a Flash light , look too see if Sight Glass is Bubbly and or Cloudy . Generally 1 small Can of Refrigerant , Will Cause, the Compressor Clutche, Too Engage. After that ? Your left Too Eye Ball the , Sight Glass . << It should Turn Clear, once Fully Charged . Some time's ? I use a pocket thermometer , in AC vent . Too impress People , that I know what Im doin ? Most System's take 2-3 Small can's Plus the Smaller Sealant , red dye can . If you over Charge System . Can cause it, Too not blow cold Air, and Dragg the Compressor Down . Be carefull Not too Over charge ! Sight Glass Goe's clear ? It's charged ! If after Say 2 1/2 Can's Sight glass isnt Clear ? << Could indicate a Leak ? Red dye will tell you where Leak is ! O- ring's for most AC's are availiable at Napa etc. Some System's Dont like too take a charge , at First . 1 Trick, is runn a water hose, over the radiator , Slowly ! << seem's too Help , on first cann . THe whole trick here, is too slowly, with as least amount, of pressure, possible . Charge the System . Back the Spike out slowly <<< Even slower than that . If for some reason Refrigerant doesnt move ? Realize that system isnt takeing it > But that you are reaching extremely high pressure's <<< Can cause serious injury etc . Refrigerant can Burn you . Especially your Eye's ! Wear safety Glasse's ! Turn Brain on etc. That's How I do it . Im no AC expert . But been doin my own , over 20+ year's . Now on whole thing , of Older model's not being compatible ? I dont really know > But NAPA should have an Application chart for the Kitt's they Sell . On a Nissan I did require Special chargeing adapter fitting . Be carefull ! SloooooooooWWWWwwwwwwwww. Take your time . Slower you charge the better ! Preferably Buy the Kitt with the Idiot Gauge ! << This way , When needle hitt's Red line ? You know too Back off . Sean
 

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Danger Danger ! I re read my post ! Messed up here . Stated Smaller hose was Low pressure . It's Not !!! Larger Hose is the Low pressure Side ! I give up ! Too hard too keep 35+ year's of blank in my Head ! I have no Idea how too edit my Post ? I need an Eraser ! Ohhh Well ! Smaller High Side is Dangerous ! <<< Dont touch it ! Shouldnt try too Explain , Some thing's I guess ????? But then Kitt comes with Instruction's ! Still miffed that these Kitt's are sold too the Public . Apologize for the Mistake . Sean
 

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I'd flush the system, add a new dryer, and 134 oil..... evacuate and recharge with 134.. If the system works satisfactorily and doesn't leak.... :thumbup:

All the BS about hose/fitting leakage is not what I have seen in the field. Even if it leaks one can all summer, so what, it's still cheap. In most of the USA 134 is on the shelf at WalMart, do-it-yourself-add-a-can.

If you need more cooling look into the Duracool. There is a substantial difference for only about $ 20 more per charge up.
 

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Save a horse, Ride a Cowboy.
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Sean's said:
Danger Danger ! I re read my post ! Messed up here . Stated Smaller hose was Low pressure . It's Not !!! Larger Hose is the Low pressure Side ! I give up ! Too hard too keep 35+ year's of blank in my Head ! I have no Idea how too edit my Post ? I need an Eraser ! Ohhh Well ! Smaller High Side is Dangerous ! <<< Dont touch it ! Shouldnt try too Explain , Some thing's I guess ????? But then Kitt comes with Instruction's ! Still miffed that these Kitt's are sold too the Public . Apologize for the Mistake . Sean
Go back in there and correct the post.
 

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Bob
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Discussion Starter #12
Hey guy's thanks for all the info,, :thumbup:
Buster I might take you up on your offer,you still have my address???
Bob,,
 
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