1999 Suburban....A/C Compressor question

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  #1  
Old 07-20-08, 05:00 PM
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1999 Suburban....A/C Compressor question

Hello all, new to the forum.

I recently purchased a 1999 Chevy Suburban 1500, auto tranny, 350 engine. I was told the AC wasnt working, and that the ladies mechanic quoted 800 dollars to fix the compressor. The vehicle has dual AC, front and rear. The blower on the front turns on and off when it feels like it, but the blower on the rear AC works fine.

I bought a remanufactured compressor and installed it myself. The system was empty of freon, so I bought 4 15 oz. cans of r134A and put them into the low line. As I finished each can, I held my hand in front of the rear A/C vents (the vehicle was running the whole time I was putting the refridgerant in) and it got a little cooler each time.

By the time all 4 cans were in, the air was cool, but not cold, and nowhere near cold. I beleive the freon capacity for this vehicle to be 64 oz, so the 60 oz I put in should suffice. Does it take awhile to run through the system? Should I add more freon? I just finished a second ago. I only let it run for 5 minutes after i was finished, and it didnt seem to get getting any colder.

Also, I am no mechanic, so I could have made some sort of mistake during all this.

Advice? Thanks in advance.

Goose
 
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  #2  
Old 07-20-08, 05:19 PM
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Not necessarily true.......

Since the system was not evacuated prior to charging, it was full of "AIR"........60 oz of freon + 64 oz of air makes for an extremely unstable environment, so dont expect much better than what you have.
 
  #3  
Old 07-20-08, 05:40 PM
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What is not neccesarily true?

I understand what you are saying though. But I am not sure what you are suggesting I do to fix it. Could you tell me what to do from here?

Thanks,
Goose
 
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Old 07-20-08, 06:14 PM
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Evacuate the system. Remove all refrigerant, put a vacuum pump on the system and draw it down to 30 inches of vacuum. Let it sit for at least 20 min. system must hold the vacuum! recharge with the proper weight charge. The charge weight should be on a label on or near the evaporator case. Did you put oil in the compressor before you put it on? did you replace the orfice tube and accumulator/dryer? If you did not do these things your new compressor will probably be junk in short order.
 
  #5  
Old 07-20-08, 06:52 PM
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Yeah I did not do any of those things you mentioned. Guess I just figured it was a simple change out. So what to do now.

I guess the first step is to empty the refridgerant. Dont know where I am going to get the vacuum setup to create the appropriate pressure. I should also take off the compressor and figure out what kind of oil it needs, and how to oil it.

I did not replace the accumulator, but I can. I dont know what or where the orifice tube is.

Thanks,
Goose
 
  #6  
Old 07-20-08, 06:53 PM
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Sorry........I tried to Quote you but it didnt work........

I beleive the freon capacity for this vehicle to be 64 oz, so the 60 oz I put in should suffice.
There is very little room for "Fudge Factor" as compared to "Antiquated" systems of old.....Charges are intended to be very specific, and the added "AIR " just compounds your issue....

Sorry but the only way to do this right is to Start over.
 
  #7  
Old 07-20-08, 07:15 PM
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Considering I already had the compressor running for 5 to 10 minutes without oil, and without having replazed the accumulutor, orifice thing, etc....does this mean I need a new compressor? And I cannot return this one because apparently I did not do everything according to the warranty specs?

Thanks,
Goose
 
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