Re: '93 90 A/C problems

["R. Cummings" <cumm@flash.net>]

At 12:41 PM 3/12/99 -0500, you wrote:
>I'm sure it's not a slipping belt, and the ISV is just a little slow to
>react.
>
>Everyone keeps saying that is' low refrigerant, but the CC head will cut
>the compressor off if the charge is low, or at least register an error
>code--no such codes.  I'm wondering if maybe they didn't put in enough
>oil last time they evacuated/recharged the system.
>
>Which brings up another question: if they evacuate the system, can they
>accurately measure how much oil was in the system?
>
>Thanks
>--
>Elliott
There is low charge and then there is real low charge. I believe the Audi
system does not turn the compressor off until it is almost empty, long after
the damage is done.

There is no practical way to measure the amount of oil in the system. When
the charge is extracted, the amount of oil removed can be measured but a lot
of oil can be lost as the charge leaks out. You can flush the system with
refrigerant using the recovery machine, which will get most of the oil out
and then start fresh.

Too much oil will degrade performance. Too little oil and the compressor is
toast. Err on the side of too much oil.

Bob Cummings
87 Coupe GT