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Need some pointers

dejablue on Tue July 21, 2015 1:26 PM User is offlineView users profile

Year: 2003
Make: Nissan
Model: xterra
Engine Size: v-6
Refrigerant Type: r-134a
Ambient Temp: 86
Pressure Low: 31
Pressure High: 230
Country of Origin: Mexico

Hi this my first post and i have a hotel in Cozumel Mexico there is no one here to work on a/c systems ,there tool box has duck tape bubble gum and a big hammer so i must do the work my self . I use my Xterra for taxi picking up guests at the airport ,last month i noticed the truck not cooling like it was,so i hooked up the gauges and gas was good on low side but only 80 on high side ,decided the compressor was getting weak so ordered a new one from the states and one of guests bring it down with new dryer and new expansion valve with a can of flush . Removed old dryer ,compressor , expansion valve flushed system . Installed new compressor + oil new expansion valve ,new dryer and vacuumed the system for 3 hours . New reading are amb 86 high 230 low 31 . Is working ok but not like is was before , at lunch time its not really good but at night it will frz you out. Been using for about a month and one morning belt started slipping on compressor so got a new belt ,worked for about 2 weeks second belt broke in half, third belt slips some times at idle but when the truck is moving a/c is working . Maybe go 2 or 3 days no problem and then it starts to slip on start up ,turn it off and get up to speed turn it on and i have a/c. My question is were have i gone wrong , and is the compressor bad and what is my next move ?

Hotel Cozumel Mexico

GM Tech on Tue July 21, 2015 1:46 PM User is offline

Probably left flushing agent in the system and it is breaking down the lubrication of the compressor- making it want to lock up--

Decided compressor was getting weak???? Most common failure mode of mobile a/c is a loss of refrigerant due to a leak-- so was the refrigerant you recovered the right amount for the system? or was it too little an amount? Chances are a recharge to factory spec would have cured your ills- after you tried to find the leak of course.

High side of 80 would be normal for a system with 1/3 the refrigerant charge in it--if you would have added a pound and high side went to 350psi then you would not have considered the pump weak- all this would need to be done before changing pump and worse yet introducing a flushing agent (that you can't completely get out) to your system.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

dejablue on Tue July 21, 2015 1:59 PM User is offlineView users profile

Before i changed compressors i did add gas the low side went up to 60 or 70 but the high side would never get above 80 that's what made me think the compressor was going south and the truck is 13 years old . I have no leaks .This is a third world country and there is no equipment to do the job right and there are no parts only what i can get my guest to bring me ,so whats my next move ???

Hotel Cozumel Mexico

Edited: Tue July 21, 2015 at 2:02 PM by dejablue

Cussboy on Wed July 22, 2015 11:58 AM User is offline

I'm NOT an expert. But I need to ask (1) if the AC belt is tight enough and that could be causing slippage
(2) if the fan clutch or electric fan(s) are operable first thing or could such resultant high side pressures be causing the belt slippage? I assume all the fan shrouds are in place.
(3) what are your idle rpm?

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