Re: Allis Air conditioning

Posted by NC Wayne on July 24, 2005 at 19:38:48 from (152.163.101.7):

In Reply to: Allis Air conditioning posted by Hurst on July 24, 2005 at 18:16:27:

Ten to fifteen psi on the low side in a R134 system is quite a bit low. The pressures are gonna vary somewhat depending on the system, as well as the outside temp and the humidity. I checked one of my shop manuals which has a chart for the "average" pressures in a 134 system and here's what it says. I'll give you the readings at both 90 and 100 degrees and you can hit a happy medium for 95. At 90 degrees, low humidity, low side is 31-37, high is 170-220----with high humidity the readings are 37-45 low and 210-290 high. At 100 degrees low humidity, low side is 35-44, high is 195-245. With high humidity, low side is 38-48, high is 230-320. Check the pressures with the engine turning at high idle, or at least 1500 RPM. The reason it's cooling some is at a lower speed the compressor isn't sucking as hard and the low side pressure is higher so the clutch is probably cutting in and out on the compressor allowing it to cool for a minute before the pressure drops and the safety switch drops it out. At high RPM the compressor is sucking harder so the pressure drops lower/faster and the safety switch keeps compressor clutch from engaging. For a quick fix you can add enough to get it back to working again, but if the pressures are still that low after adding a complete can the system probably has a pretty sizable for that much to be gone. I'd have it leak checked and also let the guy opened it up and have reciever drier replaced. If the pressure got low due to a leak then refrigerant leaking out also means moisture can get in, so the dessicant in the drier is probably saturated. A new one is probably gonna run you $50 to $75 (give or take) and that's a small price to pay for the insurance it's right. Good luck.

Follow Ups:

• Re: Allis Air conditioning Hurst 20:09:27 07/24/05 (2)
  • Re: Allis Air conditioning JMS/MN 20:36:20 07/24/05 (1)
    • Re: Allis Air conditioning Hurst 20:49:19 07/24/05 (0)

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