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A/C not cooling at all, vacun the system for 30 minutes, charge 1 pound freon 134a, reading high side 110 low side 70 .this is a bad expansion valve, restriction or a receiver dryer saturated?

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  • Anonymous Oct 21, 2008

    The Expansion Valve is in place instead of a thermostat. The Valve comes on at 0degrees celcuis. Mine is stuck in the on position which stops the Comprossor working. Replace the Valve and or compressor.

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5 Suggested Answers

rockitman187
  • 2559 Answers

SOURCE: problem started when i had heater core replaced.

The clutch won't engage until you charge the system and will engage as soon as you get close to the correct pressure.

Posted on Jul 02, 2009

  • 1 Answer

SOURCE: How do I convert or fill 92 Jeep Cherokee air conditioning freon?

If it leaks 134 it will leak R-12 .I have changed hundreds of systems over to 134 without any complaints. Don't let the 94% eff rating of 134a scare you because that does not mean that your ac system will lose 6% cooling ability .A large class 8 truck or maybe a high roof van black on black and poor insulation might tax the system in the 90% range on 100 degree days but most systems never get close .
134a high side pressure will be about 18% higher so most systems you need to change the high side cutout.The R-12 electric fan switch will be ok just make sure it is engageing the fan when the pressure comes up.You must check the condensor in front of radiator to make sure air flows easily thru it.On systems where the hoses screw on each side of the dryer I replace the dryer .Drain oil from compressor and replace with 134a oil .Replace that bad valve core (with ac valve core not a tire valve) Now very very important vaccum the system and if no loss of vaccum in 20 min charge with manufactors recomended amount of oil and freon.If a system is low on freon (cycling in & out on low pressure switch) you can add a pound of charge with those small cans of same type freon no problem but when there is a leak and the charge has been lost or changing freon types you must pull a vaccum to properlly charge the system. If you just charge R-12 or 134a your system will have traped non -condensables and a large drop in cooling ability. Hope this helps. Harold

Posted on Jul 09, 2009

greg_margo
  • 1959 Answers

SOURCE: AC not cooling for 97 Passat TDI

First recharging throug the high side is extremely dangerous and is discouraged by most HVAC mechanics.
High side pressure should read approx. 5x the low side. Low side pressure should read in the 40-45psi range unless otherwise specified by the manufacturer. Guess here is the system is overcharged is you're getting 70psi on the low side. Overcharging will damage the compressor and will underperform. Below is a link to a great source of information on AC.
http://www.cyberbright.com/autobin/air_conditioning.htm
Best of luck with your problem.
Greg

Posted on Aug 01, 2009

emissionwiz
  • 70346 Answers

SOURCE: How do I change the freon from R-12 to R-134A on a

no parts need to be changed the original expansion valve will work fine but the receiver dryer should be replaced and the system flushed with AC system flush and compressed air (condensor and evaporator), then the system must be evacuated with an AC vacuum pump for at least 15 minutes, the main thing to remember is that it requires only 85% as much R134 as R12 when you recharge the system, the conversion kits are avail any good auto parts store for about $35, u will need three cans of R134, charge the system until the low side port reading is around 28-32 PSI, at that point the system is full..

Posted on Aug 31, 2009

Testimonial: "excellent advice. Simple and to the point. Easy to understand"

  • 491 Answers

SOURCE: 99 Toyota Tacoma a/c reads high pressure on low pressure side

Does the compressor run?
Low side could be high without a running compressor.

A running compressor?
The expansion valve itself is about $50 and bolts in.
You will have to remove the 134a gas before installing a replacement expansion valve and vacuum the system before recharging.

Posted on Sep 07, 2009

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Where is the expansion valve located on the 2004 KIA Sedona


Kia Sedona expansion FRONT valve located under dash, behind glove box, fan and coil. Evacuate freon first. Disconnect Freon lines from firewall., Lay right front seat back to flat horizontal position and lay on top or totally remove the seat for easier working access. Remove under dash cover, fan, glove box, coil housing, remove coil mounting bolts, remove old expansion valve. (Inspect old valve, if debris inside, blow out coil before installing new valve. If visible debris best to consider replacing REAR expansion valve and DRIER/FILTER in front of radiator too and blow out all lines and coils while servicing.) Use compressor oil to lubricate "O" rings on new FRONT or REAR expansion valve, install valve bolts, reinstall coil bolts to FRONT firewall or REAR frame, reconnect freon lines to firewall in engine compartment. Evacuate AC system, install freon (35 1/2 ounces, nominal 3 pounds), check system for leaks, check for proper operation, enjoy.

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What are the AC pressures supposed to be on a 2000 Monte Carlo?


On hot day @ 85=+ degrees it should be between 45 to 50 pounds on the low side pressure port

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How do I fix a Air condition blow out hot air?


Go to your local auto parts purchase a a/c charge kit for about $69.00, find the low pressure(suction) fill port, there are two ports in every a/c system one is a low pressure side used primarily to fill a system with freon 123a or the like and it is the larger valve mounted on the line, then there is the dangerous high side valve, this is a smaller diameter valve mounted to a smaller diamet a/c line, this is under extreme pressure so donot attempt to fill this high side with freon as it can backfire on you and cause injury.
The low side fill kit will not fit on the high side port so thank godness for that.
start the vehicle put the a/c on full cold high blow fan speed, start filling the low side with a can of 123a freon+oil additive, which equals one pound of freon and check the inside a/c vents, getting cold? If its perfect then you are done, the system may have a very small slow leak and if it only takes a one pound can to fill it once or twice a year you are ok, if it takes more you may want to add a second pound can of freon 134a containing a dye additive that will work its way into the system and show you where the leaks are by exposing a color once it hits the air coming out of the systems defective seals etc.,also they sell a sealer + freon one pound can that can be used to try to fix the leak without having to get too expensive on the repairs.
A car's air conditioning system only hold like 2 3/4 pounds of freon, so in the event you happen to over fill the system a high pressure blow valve usually mounted on the a/c compressor will purge off the excess, but let me warn you they blow off without any warning and can startle you. Always think safety first, wear protective equipment. Work Smart, Work Safe.
Happy Motoring!!!

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2 Answers

When i turn on ac it blows hot air


Normally due to low freon. Also, notice if the a/c compressor clutch engages, as it will not if the freon is low.

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2 Answers

99 Toyota Tacoma a/c reads high pressure on low pressure side


Does the compressor run?
Low side could be high without a running compressor.

A running compressor?
The expansion valve itself is about $50 and bolts in.
You will have to remove the 134a gas before installing a replacement expansion valve and vacuum the system before recharging.

Sep 07, 2009 | 1999 Toyota Tacoma PreRunner

1 Answer

Same problem


Check for ac low pressure switch gone bad.If the expansion valve goes bad it will cause that problem,also, make sure there is enough freon in system.If you could get some one to put ac gauges on the vehicle you could tell a lot about the system,It would tell if the low side was too low(bad expansion valve)or if it was too high on the low side or high side (bas expansion valve or block dryer or condenser.

Aug 07, 2009 | 2000 Honda Accord

1 Answer

Not cooling


your low for 134A should not exeeed 45 Psi and highs for 134A shouldent get above 300. When your replacing stuff are you cleaning out the residue from your evap and condensor prior to reinstalling Freon?allso adding oil. and vacumeing your system prior to charging helps to get all the moisture out. In high humidity its crutial for optimal cooling and when system is open to the humidity for some time it gets loaded with water and vacuming can sometimes take as long as 10 hours

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2 Answers

How do I convert or fill 92 Jeep Cherokee air conditioning freon?


If it leaks 134 it will leak R-12 .I have changed hundreds of systems over to 134 without any complaints. Don't let the 94% eff rating of 134a scare you because that does not mean that your ac system will lose 6% cooling ability .A large class 8 truck or maybe a high roof van black on black and poor insulation might tax the system in the 90% range on 100 degree days but most systems never get close .
134a high side pressure will be about 18% higher so most systems you need to change the high side cutout.The R-12 electric fan switch will be ok just make sure it is engageing the fan when the pressure comes up.You must check the condensor in front of radiator to make sure air flows easily thru it.On systems where the hoses screw on each side of the dryer I replace the dryer .Drain oil from compressor and replace with 134a oil .Replace that bad valve core (with ac valve core not a tire valve) Now very very important vaccum the system and if no loss of vaccum in 20 min charge with manufactors recomended amount of oil and freon.If a system is low on freon (cycling in & out on low pressure switch) you can add a pound of charge with those small cans of same type freon no problem but when there is a leak and the charge has been lost or changing freon types you must pull a vaccum to properlly charge the system. If you just charge R-12 or 134a your system will have traped non -condensables and a large drop in cooling ability. Hope this helps. Harold

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whenever the ac system has been opened it should be hooked up to a vacuum pump designed to evacuate the ac system of any foreign debris and oil etc and after should be able to hold a vacuum to show that there are in fact no leaks then if all is ok at this point you can then charge your ac with the proper freon specified for you car when the pressure reaches satisfactory level the ac compressor will then cycle on you should not bypass the low pressure switch

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