Mixing Freon
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Mountain Pass
Joined: Sep 2003
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Mixing Freon
I have a '93 F150 and I think it has R12 freon in it. It is cycling in and out so i am assuming it must be low in freon because it does not blow cold. Can a person add R134 to this system or does the whole thing have to be converted? maybe the fittings are even different. I was just wondering because i plan to sell the truck soon and hate to invest a bunch of money in the a/c. Probably a bad idea to mix but i was just wondering. thanks, KS
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Joined: Apr 2004
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R134 cannot be added without replacing the fittings on the charging connections. Also the contamination would reduce the efficiency of the freons.
A conversion kit (with R134a) is about $40. A shop will charge $25 for the evacuation of R12. It is recommended, but not necessary to replace the drier. So for less than $70 you can have a working system for resale.
A conversion kit (with R134a) is about $40. A shop will charge $25 for the evacuation of R12. It is recommended, but not necessary to replace the drier. So for less than $70 you can have a working system for resale.
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Joined: Feb 2004
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From: va beach VA
buy the conversion kit, have it evacuated and later if you still have leaks, you can charge R134a yourself to the system = cheep.
OR
take it to the shop to recharge r12 and you'll be pay'in for a leak test. did this on wifes 92 = big bucks to fix leak.
convert it, tighten all the fittings and use some teflon tape/anti-seize on the threads of stuff you disconnected and be cool until you sell
OR
sell it and forget it.
OR
take it to the shop to recharge r12 and you'll be pay'in for a leak test. did this on wifes 92 = big bucks to fix leak.
convert it, tighten all the fittings and use some teflon tape/anti-seize on the threads of stuff you disconnected and be cool until you sell
OR
sell it and forget it.
Last edited by ssn randy; May 3, 2004 at 01:36 PM.
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From: va beach VA
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From: va beach VA
look under the hood, probable in front of the radiator, there should be a sticker there. by federal law the type of a/c coollant used in the vehicle has to be displayed and you legally can not discharge r12 to the atmoshere. that is why they leak test, if your system is low they are required to test and repair the leak prior to recharging the system with r12. your 95 should have r134a, you can buy the cans of r134a at parts stores, r12/22 for cars and houses cost about $22-25 per pound and require special equipment to evac/charge-DON'T INHALE ANY as it is heaver than air and will settle in your lungs. smoke a cig and get a little on the cherry=phosgene gas--one puff with a green cherry=dead!
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Joined: Aug 2003
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Usually where the refrigerant leaks out some oil leaks out also. With little luck and perseverance you may can find your leak. Seals are cheap at any parts house. Cycling may not indicate low refrigerant, you may have a restriction in the system.
If you spend your effort on learning how to work on A/C and buying the tools needed or finding an honest person with pressure gauges, temp gauges, leak tester, and recovery machine, you will probably end up better off than rigging your system to blow a little cool air until it self-destructs.
As you well know, it is easy to get burned on A/C repair.
If you spend your effort on learning how to work on A/C and buying the tools needed or finding an honest person with pressure gauges, temp gauges, leak tester, and recovery machine, you will probably end up better off than rigging your system to blow a little cool air until it self-destructs.
As you well know, it is easy to get burned on A/C repair.
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Mountain Pass
Joined: Sep 2003
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Thanks!!! knowing this I am going to have it evacuated, use the existing drier and recharge it myself with R134. couple questions yet:
1. when they evacuate, will it remove the old oil too>
2. if it removes the oil, will i need to add another can?
3. are there adaptor fittings made so that i can add r134?
thanks very much, Kent
1. when they evacuate, will it remove the old oil too>
2. if it removes the oil, will i need to add another can?
3. are there adaptor fittings made so that i can add r134?
thanks very much, Kent
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Joined: Sep 2003
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From: Near Wamego KS
I'll probably get jumped for this, but I have seen R134 used to top off systems that where charged with R12 - with absolutely no steps taken to purge or evacuate the system (with adaptor on the filler side). These where older systems (late 70s & early 80s) on IH tractors. All three systems are still running years after the first application. Not saying it will work in a 95 Ford - but it worked for us.
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Mountain Pass
Joined: Sep 2003
Posts: 117
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Thanks all! found out last night that my cousin who works in hvac has an evacuation pump. i will have him pump it down and i'll buy the conversion kit at the parts store. should be good to go as long as that receiver doesn't cause problems.