[s-cars] AC recharge

[JC]

I dunno about the '92 vintage, but with my '89 200 I did the cheapo
'non-OEM-approved conversion'.  Worked for almost 2 full seasons. Then
started requiring increasingly frequent top-offs. Then pretty much stopped
working regardless. That seems to be the consensus from all other reports
I've seen/heard - i.e. the 'just try R134 and new lube' trick works for a
while but then craps out.

I take that as evidence that contrary to some internet claims, they aren't
bullshitting when they say the old hoses & seals will get destroyed
eventually by the R134 & it's oil. As you say usually the quote for a "real
conversion" is very pricey as they'll claim to replace all kinds of
hoses/seals/orifices and often a big part like the accumulator, and often
the compressor as well based on the fact that the internal seals in the
compressor can't all be upgraded.

>
> the air conditioning system in my '92 works, but not very
> well.  it's been declining gradually over the past year, and
> has trouble keeping up in 80+ degree temperatures now.  i
> think it needs a recharge.  it's an R-12 system, and i recall
> earlier discussions on the list saying that there's no
> low-side port on the system.  i have a few cans of R-12 lying
> around, but if there's no low-side port, i won't be able to
> charge the system using those cans.
>
> a shop said they'd recharge it with R-12 for $120, or convert
> to R134a for $140.  given the price, i think this just means
> they'll evacuate the system, install fittings, add a
> compatible lubricant, and refill with R134a.  i don't know
> how well this type of conversion works, and am inclined to
> just recharge with R-12 for $120.  any thoughts?
>
> are there any gotchas for the shop?
>
> -teddy
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