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AC Recharge on LT1

This is a discussion on AC Recharge on LT1 within the General Help forums, part of the LSx Technical Help Section category; I have a 94 LT1 and My AC Compressor has been making noise, squeaking, since I bought my car. The ...

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    Member bryceslu's Avatar
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    AC Recharge on LT1

    I have a 94 LT1 and My AC Compressor has been making noise, squeaking, since I bought my car. The AC doesnt really work, semi-cool but not cold air. Now I have been told I can "Get a fill kit and 2-3 cans of R134 w/ lube added" to fix this.

    So what exactly do I need to pick up and how much (oz's)? I have never messed with a AC system before.

    Can anyone help me out with directions on what to do? (pictures would help too) Thanks
    94 m6 Formula - Sold
    2000 NHRA Formula - Always For Sale

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    Not sure on a complete fill on the LT1, LS1 is 1.5 lbs. Since yours is "semi cool" probably don't need that much. If you want to try charging it get a kit with a low pressure guage and refrigerant with dye in it, so you can look for any leaks if it stops cooling again. Here's a chart for the '95, yours is probably the same. http://shbox.com/1/ac_performance_chart.jpg

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    Member bryceslu's Avatar
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    I know I need to get some R-134a but how much? Do I need a recharge kit? Something like this?: http://www.partsamerica.com/productd...goryCode=3571B



    And can anyone help me out with directions on what to do? Which fitting do I put the R-134a in, the one towards the Radiator or the one towards the firewall side? (LT1)

    Thanks

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    The kit will have directions and it'll only fit on one fitting. The compressor squeak is probablly a worn/misadjusted clutch.
    Be careful when recharging with those kits. Add too much and it'll ruin your compressor. Getting a kit with a gauge will help prevent that.

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    Member bryceslu's Avatar
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    Quote Originally Posted by Cutlass View Post
    The kit will have directions and it'll only fit on one fitting. The compressor squeak is probablly a worn/misadjusted clutch.
    Be careful when recharging with those kits. Add too much and it'll ruin your compressor. Getting a kit with a gauge will help prevent that.
    Is there a way to tell if the clutch/compressor is bad?

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    Moderator Cutlass's Avatar
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    Well there is supposed to be a .020" gap between the clutch and the pulley.
    In the picture from left to right: Clutch, Pulley, magnetic coil
    . When the clutch springs get a little worn out, they don't pull the clutch back all the way and it rubs against the pulley.

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    Ok...so the Clutch never engages when I turn on the AC.
    I can however turn the clutch by hand.

    Will a recharge do any good or is the clutch/compressor done for?

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    A low charge will cause the clutch not to engage. There are sensors to detect low pressure and they won't allow the clutch to engage.

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    Well I got the recharge kit with the gauge and the 18 oz can filled her to 25 psi. The clutch kicked on and the AC worked.

    The squeaking/squeeling goes away too when the clutch is engaged. It comes right back though when the cluth disengages.

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    Moderator Cutlass's Avatar
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    25 psi sounds a little bit low and I think when it gets really hot this summer your AC won't work as well, but congrats on the progress.
    The pressure should be about 40psi.

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    Quote Originally Posted by Cutlass View Post
    25 psi sounds a little bit low and I think when it gets really hot this summer your AC won't work as well, but congrats on the progress.
    The pressure should be about 40psi.
    Yeah I was going to buy a second can but I dont use my AC anyways. I just wanted to find a way to stop the damned squealing noise...just too bad it only stops when I turn on the AC/Heat and the clutch engages.

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    Moderator Cutlass's Avatar
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    Take it to a shop and have the clutch gap adjusted. We do that all the time. There is a special tool to pull the clutch out and/or off if a person was gonna replace it.

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    Quote Originally Posted by Cutlass View Post
    Take it to a shop and have the clutch gap adjusted. We do that all the time. There is a special tool to pull the clutch out and/or off if a person was gonna replace it.
    Is there any way to possibly do this myself?
    And I was thinking it might be a bearing or something...not sure of construction of the compressor. But I guess it could be that the clutch is too tight to the pulley and is rubbing but I wouldnt think it would make that noise.

    Ill see if I can get a video of it tomorrow and youtube it or something.

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    Haha...it appears my AC is Hemorrhaging out the refridgerant. After a few days the psi is back down to 0.

    Well not able to get a good vid...audio doesnt pick up the sound real well.

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