Question about 1990 Toyota Pickup

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I have a 1990 extra cab 4x4 22RE auto.I took out R12 and put 2 cans of 134. compressor will not kick on unless jumped. ac on off button does not light up so i went to junkyard and found another.it does not show a light either.could both these switches be bad or do i have a bigger problem???

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Check the pressure switch.

Posted on May 27, 2010

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Ac problem at idle after converting over to 134a from r12


to convert from r12 to r 134 a the entire system has to be changed
that is condensor, compressor, evaporator, hoses ,the lot because r134a runs at much higher pressures than r12 ( nearly 3 times higher in psi)
it needs different gauges and has different fill connections so that the gasses cannot be mixed
to make it worse the oil used in the compressor is different because of the different gas and is not compatible with the r12
there was nothing wrong with r12 gas but companies and customers were "hoodwinked" into believing that the r12 was bad for the atmosphere and r134a was the answer
just as you have been " hoodwinked" by the person into getting a gas change over without being fully informed of what was involved and why
with r134a gas there has to be a fan in front of the condenser that works immediately the ac is switched on as the temp of the gas being converted back to liquid is much higher because of the higher pressure need to convert it back from gas to liquid
without that fan the system starts to circulate gas and so the evaporation of the liquid at the evaporator in the car is lost and no heat from the car is transferred back outside
what it means is this --- if you can get r12 gas , change the compressor back to an r12 compressor, have the system completely flushed, vacuumed down for at least 1/2 hour and then refill with r12
If on the other hand you have to use r134a because that is the only compatible compressor available then the evaporator , hoses and condenser have to be changed as well and that means a new ac kit basically
find yourself an accredited ac specialist shops and get quotes

Mar 03, 2017 | 1993 Chevrolet Cavalier

1 Answer

Trying to locate where to put 134 in to ac unit


in 1990 cars took r12, if your car has not been retrofitted to 134 the valving will be wrong, and you will not be able to add freon. you will have to at least get someone to look at it and tell you if it has been retrofitted or not

Aug 11, 2011 | 1990 Buick Reatta

2 Answers

After having my AC system charged, it doesn't get


It is probably overfilled if that is the case. You have an safety cut-off switch that cuts off the compressor when there is too much refrigerant or too little refrigerant. Take the vehicle back to your technician and have him fix the problem. He can relieve some of the pressure until the compressor kicks on again, as long as the additional pressure didn't blow any seals or your compressor.

May 25, 2011 | 1990 Toyota Camry

2 Answers

Ac not blowing cold, check main relays, has r12, jumpered and clutch kicks in. checked all fuses and relays swapped horn and ac OK... she has the push button ac controls.... thinking its something with...


there is a pressure switch on the ac drier that is the big silver can looking thing by the dash under the hood... if this goes bad the ac compressor will not kick on and the fans will not run when the ac is turned on... if the fans are not running at the same time of the ac compressor it will not blow cool..

Jun 12, 2010 | 1992 Buick LeSabre

2 Answers

What do I need to replace to convert my ac to r134a on a 88 chevy s-10 blazer


need to have the a/c system evacuated and flushed out with the appropriate cleaner.Replace the orifice tube and drier, and purchase a retrofit kit at any parts house. Recharge system with appropriate amount of oil charge and freon. It will take less R134a than it did R12.

Sep 03, 2009 | 2001 Chevrolet Blazer

1 Answer

I was told to replace the air compressor on my


All your culprits are correct , and no the fans will come on when pressure is built upon the sensor on or near the drier when the comprssor kicks on.

Aug 07, 2009 | 1990 Toyota Camry

2 Answers

How much freon to put in the 1990 chevrolet c1500?


Switch on the AC @ max. open all doors, run engine at 2000 rpm, add freon to low pressure side of compressor, until bubbles stop in sight glass at the top of the liquid receiver.
hope this helps

Jul 28, 2009 | 1990 Chevrolet K1500

2 Answers

Need to recharge ac in 1995 chevrolet blazer. Not


1995 should have 134A. Look on the compressor and in the middle of it will be a sticker that says 134a or r12. If it is r12, you must retrofit it in order to charge it yourself.

Jun 24, 2009 | 1995 Chevrolet Blazer

2 Answers

1997 Deville ac compressor locked out - low


70 psi static does need a charge.find compressor relay, jump relay and compressor will start. add refrigerant,replace relay and a/c should work fine

Apr 16, 2009 | 1997 Cadillac Eldorado

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