94birdman Posted July 15, 2008 Report Share Posted July 15, 2008 I have a problem with the ac on my t-bird. The compressor cycles on and off constantly at about 5-10 sec intervals. Using a refill kit pressure guage I checked the pressure on the low pressure side of the compressor and it reads green(good) and increases to yellow(too high). As soon as the pressure goes into the yellow zone, the clutch immediately disengages at that moment and it goes back down to green again. This cycle repeats again and again every 5-10 seconds. There is no reason why the system should be overfilled. Everything worked fine last summer. What is wrong? I suspect a bad pressure sensor or clogged orifice valve. How sould I go about troubleshooting this? Can I perform an impedence test on the pressure sensors? Any input is appreciated. Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted July 16, 2008 Report Share Posted July 16, 2008 does the radiator fan come on when you turn on the ac? if it doesn't the hot freon in the condensor can't beturned back to liquid and it hits hi pressure cut Quote Link to comment Share on other sites More sharing options...
94birdman Posted July 17, 2008 Author Report Share Posted July 17, 2008 the fan does come on and it operates as usual. Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted July 17, 2008 Report Share Posted July 17, 2008 the best way to check is to evac and recharge the system and see if it still has the same symptoms if not it was probably just low if it continues to run funny you may need to change the dryer and the orfice tube Quote Link to comment Share on other sites More sharing options...
94birdman Posted July 18, 2008 Author Report Share Posted July 18, 2008 Thats what I'm gonna do. Thanks for your help. Quote Link to comment Share on other sites More sharing options...
94birdman Posted July 21, 2008 Author Report Share Posted July 21, 2008 when trying to recharge the ac, I noticed that the pressure on the low side reads 100psi with the compressor off. It reads 10psi with the compressor on. Should the low side have that high of a pressure with the compressor off? It still needs more gas to get from 10 psi up to around 35 psi so I'm hoping everything is okay. Quote Link to comment Share on other sites More sharing options...
94birdman Posted July 23, 2008 Author Report Share Posted July 23, 2008 I recharged it with 2 cans of R134. It works great for now. Apparently the low side reading 100psi w/ the compressor off is normal. I was just paranoid. Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted July 24, 2008 Report Share Posted July 24, 2008 yep your straight 20-30 psi on the low side running 100-300 psi on the high side depending on temp and model pressure should equalize when the car is off Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted July 24, 2008 Report Share Posted July 24, 2008 I recharged it with 2 cans of R134. It works great for now. Apparently the low side reading 100psi w/ the compressor off is normal. I was just paranoid. 2 CANS AT 12OZ IS FAIL. SHOULD TAKE 2.2 POUNDS OR MORE. :cool:16oz to a pound. thats why the low side is getting to 10 and cutting off the compressor Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted July 24, 2008 Report Share Posted July 24, 2008 I recharged it with 2 cans of R134. It works great for now. Apparently the low side reading 100psi w/ the compressor off is normal. I was just paranoid. You really should get the evac/recharge professionally done. Those cans aren't worth shit. You need to fill it with a specific amount noted on the sticker. Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted July 24, 2008 Report Share Posted July 24, 2008 You really should get the evac/recharge professionally done. Those cans aren't worth shit. You need to fill it with a specific amount noted on the sticker. plus 1, and they have sealer in them and can kill a a/c machine now. sealer just gums up thw works. i mean stop leak was a great idea, but i loved replacing heater cores after someone used it Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted July 24, 2008 Report Share Posted July 24, 2008 plus 1, and they have sealer in them and can kill a a/c machine now. sealer just gums up thw works. i mean stop leak was a great idea, but i loved replacing heater cores after someone used it Yeah, I didn't feel like going into that lol. Fuck cans, the end. Quote Link to comment Share on other sites More sharing options...
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