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My compressor kicks off after 15to20 minutes fully charged

jarrod27 on Fri June 04, 2010 2:29 AM User is offline

Year: 1992
Make: infiniti
Model: g20
Engine Size: 2.0
Refrigerant Type: r134
Ambient Temp: 85
Country of Origin: United States

I recently retrofited a r12 to 134a I used a used 134a compressor. After I changed all the orings and put a new belt on which is tight. I charged at 1500 rpm which is required 24 ounces of high mileage 134a & oil with system safe leak sealer. The on the hood called for 1.8 lbs of r12 so i did the math. I have a sniffer also i havnt used it though...> but the vacuum test held. when the engine is at 1500 rpm the readings are ok but when its at regular 700+-50 rmp it reads high. When I first start my car for the first time the ac usally works for about 15 minutes then cuts off and will come on at other times every once and a while. My ac push button switch failed the continuty test when the button is off and the defrost is on BUT it passed for turning on the ac it has continuty when ac button is pressed. I will take the reading when ac is not working at 1500 rpm and post them if that is what you need ///IS it?

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I recently retrofited a 92 infinity g20 and it will cool for about 15 to 20 minutes then the compressor stops.

mk378 on Fri June 04, 2010 8:03 AM User is offline

This is very often because the clutch gap is too wide. After the coil has warmed up (normal) and lost some of its magnetic power, it becomes insufficient to pull the clutch in. Check that the clutch wire is getting power when the compressor is supposed to be on. Or just close up the gap some and see if that helps.

Is there an rpm sensor on the compressor? If there is there would be a protective system which may be malfunctioning.

HECAT on Fri June 04, 2010 1:24 PM User is offline

Quote
Originally posted by: jarrod27
I recently retrofitted a r12 to 134a I used a used 134a compressor...AND... high mileage 134a & oil with system safe leak sealer.

Why retrofit? Why change the compressor? What happened to the old one?

Used compressor... Ok, it can be done.

High mileage R134a... What does this mean? Used refrigerant? Recycled refrigerant? Old refrigerant? Tired refrigerant?

oil... How much? What kind? You did remove all the old R12 mineral oil to retrofit, right? You have now added back the factory specified amount of fresh oil suitable for R134a, right?

System safe leak sealer... System safe? Now we all know that the hardening or seal swelling sealers are NO good for a system. I guess the manufacturers have decided to use this wording to deceive those that don't know.

Pressure reading at 1500 RPM OK (?) What number is OK?... and higher at idle (?) Throw away the tire pressure gauge and get some real high and low pressure readings.




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jarrod27 on Fri June 04, 2010 9:07 PM User is offline

I have a set of good master cool gauges but dont remeber what the reading were when I last had them hooked up. The high mileage 134a & oil with system safe leak sealer...is all in one 12oz can that comes in a set of three and is part of the retrofit kit. I hooked the compressor power wire up to my ohm meter set on 12volt check mode and it came back at 0.03 volts with the ac switch on I know that the switch is working. But I dont know why the electrical system is not giving 12 volts to the compressor. I did not measure the oil out of the old compressor before I turned it in as a core...ooopppsss did not know to but now I do. So I just used the used compressor as is with the oil that was in it after I dropped it from the used car. The old compressor locked up on the last owner. I will try to hook gauges up tomarrow and get the readings and post them. I also hit the front of the compressor clutch a few times and it did not kick on.

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I recently retrofited a 92 infinity g20 and it will cool for about 15 to 20 minutes then the compressor stops.

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