[DML] Re: Workshop Manual vs. Service Bulletin - R12 Anomaly

["Harold McElraft" <hmcelraft@xxxxxxx>]

I believe the spec change was for all vins. I experimented a lot in 
the early days in Houston. My first new D was charged without adequate 
oil and apparently adequate air removal because the system was trashed 
inside with moisture, the new AC accumulator installed from that issue 
was apparently damaged internally and clogged the orifice tube - 
blowing the new compressor - that one was under DMC warranty (that's 
right) but after that it was all on me. As a result of all the messing 
and replacing I found 2.5 to be the best. 2.75 was just enough in 
really hot weather to keep the pressures a little too high and kept 
the system from cycling and reduced performance. The system will drop 
to 2.2 before you know it and down to about 1.6-1.8 before you notice 
a cycling issue. So, you can see that the system is very tolerant. I 
used 2.5 in Houston for years and got the best results - however, at 
any level charge, it is very important that your fans are functioning 
properly. If you are at 50mph then no problem, but running around 
town, inadequate fans will send the high pressure side to the max 
causing poor performance and the potential or some major system damage.

Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, "Stephen Card" <stephen@xxxx> wrote:
> Section N:07:01 states the total charge for the a/c system is 2.5 
lbs.
> Service bulletin # ST-29-11/81 states "The freon charge has changed
> to 2.2 lbs. from the previous 2.75 lbs. The new specification was 
> introduced with V.I.N. 4080."
> Which is the correct origional charge 2.5 or 2.75?
> Is the new spec for ALL cars or only after vin 4080?
> Thanks,
> Stephen
> Vin 3601








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