Well first of all you need to figure out how much R12 is supposed to be
in there. You want to install 80(maybe 85)% of that amount. When that
is done if everything is correct, you should probably see somewhere
between 30 and 50 on the low side and 250-350 on the high side. Sorry I
cant be more specific but alot of it depends on the temp. If you are
getting generally those kind of readings everything is probably working
right. If the high is low and low is high, then you have something
wrong. If the pressures are about the same the compressor is not doing
anything. Im sure somebody can point you to some info about what
specific things can be wrong with a given set of incorrect pressures.
tom savage wrote:
I know it is a little early to be asking about this, but thought I'd
avoid the spring rush and ask now.
I'm resurrecting the AC on a 1990 560SEC and the owner wants to convert
to R-134 (I know, I know...) We've got everything installed, replaced,
flushed, and ready to charge, except for one small bit of info: What
pressure should I be seeing on the low side when the system is fully
charged? I'd rather use my real gauges to check this and not just rely
on the cheap gauge with plastic fittings reading in the green area.
This is my first time charging a 134 ssytem.
Thanks,
Tom
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