Phil, it sounds like there is a blockage. I'd suspect the dash side,
probably the expansion valve. I know your not supposed to blow air through
the system but I'd probably disconnect the drier and try and blow air from
the compressor back through the expansion valve/evaporator. If it is not
blocked, I'd try the condenser. If all else fails, try to see if the drier
is open. If you have no suction you either have a blockage or a bad
compressor.
Kerryp
----- Original Message -----
From: <pbrust@xxxxxxxxxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Sunday, November 30, 2003 6:49 PM
Subject: IML: Two bad compressors in a row?
> Recently, I replaced a seized AC compressor (Mopar C-171) with a new unit.
After a long vacuum and a few days to see if any leaks were present, I
connected the R-12 cannister, purged the hoses, started the engine, and
jumped the low pressure switch. The clutch engaged but both gauges read the
same: 61 pounds, the cannister pressure.
>
> There was practically nothing visible in the sight glass (one very small
bubble)and there were no unusual noises from the compressor. I cycled the
clutch several times with the jumper but the pressure reading in both gauges
never changed. I concluded the cylinder head(s) was bad and had another
compressor shipped.
>
> Exactly the same thing happened with the second new compressor...with no
suction, it's impossible to charge the system beyond equalizing pressure
with the canister.
>
> >From experience, I know new parts are seldom to blame and the probability
of two faulty compressors in a row (one manufactured in 1995 and the second
in 2001) is quite low.
>
> What am I missing?
>
> Phil Brust
> Jefferson GA
> 73 & 82 Imperial
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