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A/C dead as door nail ....[740-760/86] posted by Boris on
Tuesday, 26 May 1998, at 10:22 a.m.
I own 1986 740T with B230 engine. A/C is not producing cold air.
All was well few months ago (last time I used it).
I want to check simple things out first. Belt appears tight enough, and I see
no leaks. On other cars one can usually hear the A/C clutch engage. Not here.
There is one wire coming to the compressor. What kind of voltage should it have ?
What is the purpose of the little green plastic-looking thing through which this wire
is going ? It sits on top of the compressor. The motor fan if fine, as well as the sliding
controls. Fuse (no. 9) is also o.k.
Help it's getting hot in N.C.
Re: A/C dead as door nail ....[740-760/86] posted by J. Smith on
Tuesday, 26 May 1998, at 12:04 p.m.
Probably does not have any freon (r-12) in it. Switch you are referring to is a low pressure switch which will preserve the compressor if sufficient freon is not present. Take it in for a re-charge. You may consider switching to the newer refrigerant. I did and I get about as good a cooling as I did before which isn't to say much with a Volvo. I guess they don't need much cooling capacity in the nordic countires.
My freon leaked out due to a plastic band which chaffed through the low pressure aluminum fitting at the compressor. This was discovered after the fools replaced my compressor. Pick your people well.
--J. Smith
Re: A/C dead as door nail ....[740-760/86] posted by Boris on
Wednesday, 27 May 1998, at 8:27 a.m.
Thanks a lot for responding, it's well appreciated.
There is a new twist to this situation. I was checking wiring
to the expansion tank (I don't know if this is correct name - the
"thing" that sits roughly above the exhaust manifold) and it
appears in BAD shape. Virtually no insulation. Used my trusty
E-tape, covered it well, and re-installed it. You guessed it !
The A/C now seams to be "alive" again.
I want to check ALL the wiring involved with A/C operation.
Does anyone have a diagram of it with appropriate voltages ?
For starters, how many volts should I see coming to the expansion tank,
and how many to the compressor. Also, at what point of operation ?
Thanks in advance.
Welcome aboard George, it's great having experts like you on the team.