Question about Oldsmobile Aurora

4 Answers

I have a 2001 Olds Aurora 4.0 L V8. I have owned the car for about 6 months. THe AC has never pumped cold air. TOnight, I decided to recharge it using the off the shelf do it yourself kits. So far I have added a can of stop leak w dye...no leaks found. I have added 4 12 oz cans of R134 refrig. At the beginning I read no pressure to speak of. After 4 cans, I am up to 10 lbs...still no leaks, but the compressor will not kick in...therefore, no cold air. I have never used more than 4 cans in the past on other vehicles...but I have never charged this one...so I am hesitate adding more without come conceept regarding the capacity of the system. There have been no issues in terms of the system taking the refrigerant...and as I said, the pressure is gradually increasing... Thoughts or comments would be most appreciated... Thanks, Les

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  • 3 more comments 
  • Les Schalm May 24, 2011

    This was worthless...

    Can I get some additional responses?

  • Les Schalm May 24, 2011

    Any other advice? Why would 4 cans be accepted into the system? No leaks, compressor fuse is good...

  • Les Schalm May 24, 2011

    have a 2001 Olds Aurora 4.0 L V8. I have owned the car for about 6 months. The AC has never pumped cold air. Tonight, I decided to recharge it using the off the shelf do it yourself kits. So far I have added a can of stop leak w dye...no leaks found. I have added 4 12 oz cans of R134 refrig. At the beginning I read no pressure to speak of. After 4 cans, I am up to 10 lbs...still no leaks, but the compressor will not kick in...therefore, no cold air. I have never used more than 4 cans in the past on other vehicles...but I have never charged this one...so I am hesitate adding more without come concept regarding the capacity of the system. There have been no issues in terms of the system taking the refrigerant...and as I said, the pressure is gradually increasing... Thoughts or comments would be most appreciated... Thanks, Les

    I have verified the fuse and the relay are functioning...my math indicates 48 OZ (4 12 oz cans = 48 Oz or 3 lbs) of R134 have been added...and still no change...nor do I detect any leaks.

  • Les Schalm May 24, 2011

    I tend to agree with your thinking...that is why I started with the red dye leak indicator. I have seen no evidence (though I did not take off the heater box) indicating there was a leak.

    Also, as an aside, the low pressure inlet line would get very cold...as would all of the cans...I have done this one other cars in the past (with 100% success I might add) and I never remember this happening...though this is the first R134 refill I did (all previous ones were conversions).

    One more dumb statement...the low pressure access port is on the left side of the engine compartment...right next to the fuse box...correct?

    Thanks for your insight...the best I have seen on this topic///

  • Les Schalm May 25, 2011

    It fit just fine...no leaks there...I will look elsewhere...

    Thanks

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4 Answers

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  • Oldsmobile Master
  • 8,183 Answers

Hi, I believe the capacity of the system is less than 4 cans, so there must be a leak or it was leaking from the can as you were trying to put it in. Is your hose fitting sealing tightly to the can? Usually, we bypass the pressure switch to get the compressor to come on while filling the system. It will fill much faster that way. How do you know the evaporator is not leaking--do you have the heater box open?

Posted on May 24, 2011

  • Jeff Turcotte
    Jeff Turcotte May 24, 2011

    I've seen this before. The cans go in, the system starts to cool, but it never gets full. Usually a slow leak in the evap coil.
    As far as the port goes, it is the only port along the line from the firewall to the compressor; and you can't get it wrong, because the hose will not fit on the high pressure port. In fact, there is nothing else in the car that hose QD will fit on. It fit well, didn't it?

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  • Oldsmobile Master
  • 5,370 Answers

Air Conditioning Refrigerant . . . . . . See refrigerant charge label under the hood for exact capacity.
Its capacity is 0.906 Kg. (2.0 pounds).
--------
when 1 lb. of refrigerant has entered system, engage compressor by setting A/C lever to NORM and blower switch to HI to draw in remainder of charge.On all models, cooling condenser with a large fan will speed up charging procedure by maintaining condenser temperature below charging cylinder temperature.Close refrigerant supply valve and run engine for 30 seconds to clear lines and gauges.With engine running, remove charging low side adapter from accumulator service fitting. Unscrew rapidly to avoid excessive refrigerant loss. Do not remove a gauge line from its adapter when line is connected to A/C system. To disconnect line, always remove line adapter from service fitting. Do not remove charging hose at gauge set while attached to accumulator, as system will be discharged due to depressed schrader valve.Replace protective cap on accumulator fitting and turn engine off.Check system for leaks.Start engine and check for proper system pressures.
------
This will help.Thanks.Helpmech.


Posted on May 24, 2011

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  • Oldsmobile Master
  • 17,970 Answers

With a/c and engine off, 65psi sounds a little low. You are hearing the compressor kick off when pressure gets below 25psi or so. the low side system pressure should stay around 32-40 psi depending on underhood temps. The compressor will kick off if too low-25 psi.

Sounds like the freon charge is too low, therefore a leak. could try to add 1/2 lb. more. Best way is to have the system evacuated, and the proper charge put in. Should be about 2 lbs. The knocking noise you are hearing could be a failing compressor. Need to have the proper freon charge in the system before any other diag.

Additionally, I suggest check the A/C CLUTCH fuse (POSITION 26) and the A/C CLUTCH (POSITION 32) relay in the underhood fuse block are the first things to check. An easy way to check a relay is to swap it with another of same type and n umber of terminals with another in that fuse block....

I have a 2001 Olds - zjlimited_1277.jpg
There is also a pressure switch on the back of the compressor, make sure that is plugged in. Also a pressure sensor on the line off the back of the compressor, make sure it is plugged in.

The Powertrain computer (PCM) controls the relay to engage the clutch when it is requested.

Keep us updated.

Posted on May 24, 2011

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  • Master
  • 1,386 Answers

Hello and welcome to FixYa!

Few things to look at to resolve the issue, compressor clutch might be faulty that's why it won't function properly. Thermostat and expansion valve can be faulty as well so I strongly suggest that you have it replaced before charging another set of refrigerant.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on May 24, 2011

  • afarri
    afarri May 24, 2011

    Yes sir it's kinda odd right? Leakage may not be visible so I strongly suggest that you look in the evaporator or condenser. There you might find the leak.

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