Re: [DML] Re: A/C cutting out
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Re: [DML] Re: A/C cutting out

Thanks Harold, David & John for the replies.

A rare event, I got home tonight and the A/C wasn't working when I was in my
driveway. Usually, it's kicked back on by then (or never kicked off). I
checked the red wire going to the compressor and it had +12V, but the
compressor was still not cycling. Turning the A/C on and off didn't give me
the normal click & drawdown on the engine that it usually does.

I'm going to replace the compressor. It's 25 years old, it's had about
enough. :)

Thanks again,


On 6/26/06, Harold McElraft <hmcelraft@xxxxxxx> wrote:
>   Sounds like an electrical circuit or the clutch on the AC compressor.
> If fan speeds 1 and 2 work then the fuse that runs the clutch is ok.
> Sometimes the clutch windings lose the ability to engage the clutch.
> You can check the current draw by jumpering the clutch at the
> connection at the clutch. 12 volt positive. You should get a nice
> snap engagement which tells you there is too much resistence in the
> circuit somewhere before the compressor. If the clutch engages slow
> or drags or gives up after a few minutes there is probably too
> little current draw indicating an open winding (3amps minimum) which
> means replace the clutch or compressor.
> Harold McElraft - 3354
> --- In dmcnews@xxxxxxxxxxxxxxx <>, "Ryan Wright"
> <ryanpwright@...>
> wrote:
> >
> > My A/C simply cuts out sometimes when driving. The air will blow
> nice
> > and cold, then at random will slowly get warm. It eventually kicks
> > back in and cools down again, sometimes after 30 seconds, sometimes
> > after 5 minutes. Driving doesn't affect it - I can be at idle or at
> > speed the entire time.
> >
> > I suspect one of the pressure switches is kicking the compressor
> off
> > when it shouldn't; all fans (interior blower & cooling fans) are
> > working fine. I'm running R12 and the system is full per DMC specs.
> > A/C shop looked at it but the problem is intermittant and they're
> > having trouble diagnosing it, as every time I bring it in the darn
> > thing works fine.
> >
> > Any advice on how I might troubleshoot this?
> >
> > -Ryan
> >

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