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Compressor Replacement Help

mgmoore7 on Mon June 02, 2008 9:52 AM User is offline

Year: 1998
Make: Isuzu
Model: Hombre
Engine Size: 2.2
Refrigerant Type: 134

After a few years of a very slow leak on the compressor and recharging every 4-5 months, the leak has either gotten much bigger or I have another leak somewhere else in the system.

The last charge did not hold for 24 hours.

I pulled a vacuum on Sat and it would go to about -28 within 5-10 minutes but then when the valves were closed and vacuum shut off, the vacuum dropped to about -20 within about 30 minutes. I pulled the vacuum again to confirm the results.

I have not gone into further leak detection at this point. Is that advisable or should I go ahead and assume the compressor is the issue and replace it 1st. The system was leak checked a few years ago and it was the compressor that had the leak. I could see the dye myself on top of it.

The system was working fine and did its normal "fading" of cooling over a few week period that has occured many times before. When I charged it the last time with freon, it blew cold during the charge but the next day it was hot again.

I am putting together a list of items needed. Could you help confirm.
1. Mastercool AC Flush Kit
2. O-ring Kit
3. Sealing Washer Assortment
4. Compressor - the price difference for the China and this one is about $155. That is big.
5. Accumulator-Drier
6. Whit Orfice Tube

Did I miss anything? Not sure that I need the both the o-ring and sealing washer assortment????

Thanks for your help.

mk378 on Mon June 02, 2008 11:40 AM User is offline

While you're at zero pressure, check the OT. If it's clean you can just slap a new compressor and drier on without flushing. You will need some oil.

If the leak is still at the compressor it should be bad enough now that it will easily show with soap bubbles.

mgmoore7 on Mon June 02, 2008 12:10 PM User is offline


I will check the OT. I still need a new accumulator & OT, correct?

How do I determine the right type of oil?

mgmoore7 on Mon June 02, 2008 8:17 PM User is offline

I tried again to charge the system into a vacuum.

After about 45 minutes of charging on the 1st can and there is still a good bit in the can, the pressures are

L 30
H 125
Ambient temp: 89

Put some soapy water over the compressor where the leak was known to be but did not see anything. No evidence of the system cooling at all at this point. Going to let it charge some more.

Any further tips/suggestions before I pull the trigger on the parts.

Do you know where the orfice tube is on this truck?

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