Question about 1992 Buick LeSabre

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How do I convert from r12 to 134a cooling refrigerant in a 1992 Buick Lesabre?

My 1992 Buick lesabre must be a little low on freon. It still requires r12 which I can't buy anywhere. It's cooling ok but not like it should. What all do I need to do to convert it over to 134a?

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I did it a real long time ago on a 1977 camaro...They sold a conversion kit with valve adapters and a solution flush.. It worked for a while but the dyer got clogged and it was a rap. The molecular structure of the new refrigerant is much smaller and leaks out of older systems. It is not compatible with the old r12 You best to leave well enough alone and see if you can locate some r12 at a premium .

Posted on Jun 07, 2015

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I think you can still find the old R12 at a premium price. It would be worth it if your air con system holds well with no significant leaks. Genuine 12 Refrigerant LARGE SIZE 2 14 oz Cans
The old refrigerant and oil are not compatible with the new stuff. The expansion valve is questionable, may or may not work properly. The oil in the compressor, in the evaporator, in the condensor, and in the accumulator/filter/dryer need be removed thuroughly. New service port adapters are installed. Then the new R134 can be introduced. You may find a conversion kit with instructions.
I recall a bulletin calling for replacing the oil and reusing the refrigerant, repeatedly, 2-3X, the final oil replacement gets the new refrigerant.
When ever the system is exposed to the atmosphere, it should be evacuated before refilling. So much to think about and consider.

Posted on May 27, 2015

  • Jorge Rosado Jun 23, 2015

    The old R12 is mineral base lubricated, the new r134a is synthetic based. The R12 and the new synthetic based lubricant are not compatible, visa-versa, so the system needs to be thuroughly flushed out before converting. The refrigerant metering valve, condensor, and evaporator are close and similar to the size on old and new system, but some systems may need adjusting, not all systems, just a few, rarely.
    To conver a new filter dryer, new lubricant, new refrigerant, thurough flushing, new seals, new retrofit service ports, labor.

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I took mine to a refrigeration school and they let the students do it with r12

Posted on Jul 01, 2015

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The deccant in the receiver-drier are differant sizes on both systems so ur supposed to swap to one compatable with r134. Try ur local hvac repairman for r12. A lot of rooftop building units still use it. My guy lets me sneek some from his (or should i say, bosses) propane grill size bottles

Posted on Jun 24, 2015

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Just change multi flow cooling? condenser then you can change r12to134

Posted on Jun 21, 2015

  • harjit singh Jun 21, 2015

    just change multi flow cooling? condenser then you can change r12to134

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Posted on Jan 02, 2017

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How to override the low A/C charge on 1992 buick lesabre


You can't. Service the system, fix the leak which is the front AC compressor seal.

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IT SOUNDS LIKE IT IS LOW ON FREON.HAVE YOU ADDED ANY LATELY?YOU SHOULD CHECK THAT FIRST.

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Assuming there are no leaks, you could just need a little freon. But, If the fan (on the radiator) is not kicking on then your compressor may not come on either as it needs the fan to run to help keep the compressor cool. Typically it stems from being low on freon though and Autozone sells freon you can self administer but I would advise asking someone familiar with adding freon to help you so that you don't over fill or try to fill it from the wrong port.

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I am going to assume you meant AC Compressor as the condenser is basically like a radiator in that it cools the freon.

I would say that your freon is probably too low to kick the compressor on. This could be simple as adding some freon (With Leak stop(just to be sure)) would get it working again. The question is, why did it get low? Could be just age and it needs a little freon but usually means that there is a leak somewhere (Hopefully it is not the condenser leaking). Some leaks are small enough that you just need to add freon every month or so but they eventually get bigger. Look for oil around the AC connections and hoses. Could be an O-ring that has gone bad. Hopefully it is simply low on freon.

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When i turn on my air conditioner on my 2002 Buick LeSabre my fuse blows for the right fan. Do i assume the fan is bad? The left fan still works when the car gets hot.


My air conditioner on my Buick has a full charge of Freon and when it is hot out I don't get the cooling power in the cabin as I have it on low switch so when I put the switch on the high the Air doesn't change to cool the interior on high. I had the Freon tested and it still doesn't work properly and I wonder if there is a sensor that doesn't allow the system to cool properly?

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1 Answer

How to add refrigerants? To a 2000 buick lesabre.My car is blowing hot air it went from cool to hot. and now it just hot air coming out.


look for the fitting that is the smaller of the two and is attached to the line that is the larger of the two, this is the "low" fill side, add 2 cans of r134a freon each can is one pound the system empty holds 2 3/4 pounds of freon thats 2 3/4 cans.
I would buy 1 can of leak detector/freon combo and one can of dye/freon combo, if it takes more add a small amount of a third can that has an oil mixture in with the freon that would complete your systems needs the cheapest and fastest way possible.
If you want it done to the book then you need to have a certified A/C man vacumn pump down the system, replace the reciever drier, add freon and oil to fill the system and then check for leaks.
Happy Motoring!!

Jul 14, 2010 | 2000 Buick LeSabre

1 Answer

Freon and connector for 1986 buick lesabre


there are two hoses coming out of the firewall side by side .. one is large and one is small ... they both have valve ports but only the large tube (low pressure side) is to be used for adding refrigerant .. if your connector from the R134a can does not fit ..then you probably have the older R12 system .. that has been outlawed now because of ozone layer destruction caused by it ..you cant get that anymore .. you can however convert your system to R134a but it involves washing out the entire system and replacing all rubber parts ..then attaching adapters so the R134a will connect (availible auto parts) .. by law any remaining R12 in your system has to be recovered, not vented to air .. (actually the r12 is worth a fortune right now but it may not be legal to sell ..its about a 25 times increase) ... the modification process requires a "certified" tech to do the work and the results wont be quite as good as the old r12 ... at least it will work if the system is cleaned out enough .. the two refrigerants dont like each other .. that is, the lubes that are used do nasty things when mixed .. if you wanted to you could become "certified" by attending some classes and passing a test on ozone layer depletion ... now they have discovered that r134a is a powerfull green house gas .. so that also will be phased out in the future .. its like 1600 times worse than CO2 ... r12 was a wonderful chemical .. very hard to beat its performance and stability .. .

Jul 05, 2010 | 1986 Buick LeSabre

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Air conditioner in 1992 Buick Lesabre wasn't blowing cold air


If you would take the car to Auto Zone, ask the employee to show you where the "low pressure cut off switch" is located and ask him to supply you with a small jumper wire, it is possible the a/c charge is not enough if the low press. switch didnt come on to turn the compressor on so you need to jump it across the two wire terminals with a wire and the car running on high fan/a/c full cold, then install another can of freon and feel the cold, the system should typically hold approx. 2 2/4 cans of 134a freon to be full if it was empty.

Jul 02, 2010 | 1992 Buick LeSabre

1 Answer

How much to recharge A/C unit in 92' Buick LeSabre?


Depends on if it takes R134 A or R12 refridgent. R134A most likley looking around $150 depending on amount of freon the system holds. if its R12 open your piggy bank cause its going to cost you some coin as R12 is no longer in production you have to convert your system to R134A or find a gararge that still has some R12

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