Re: [DMCForum] A/C Question

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Is it a hot day? have you tried revving the engine?

On a hot day, the compressor will more-or-less run continuously at idle.

Mine does. The colder the ambient temp, the more it cycles.

Martin

Dave Stragand wrote:
> Hi All,
> 
> I hooked up the A/C today, evacuated it, and charged it up.
> 
> I evac'ed the system for about 90 minutes, at 28" Hg, then charged it up.
> The low side pressure is at 32, the high side at about 170-175, and the temp
> today was about 75 F.
> 
> The system is blowing pretty cold (though not sure how cold, as I cannot
> find my A/C thermometer anywhere) but the compressor isn't cycling -- it
> just runs continuously.
> 
> Following the checklist in the workshop manual, it says to check for missing
> expansion tube (it's in there, and it's new), or that the system is
> overcharged.  Considering it only would take about 28 ounces of R12, and the
> service bulletin calls for 36 oz, I don't think it's overcharged.
> 
> (I do have one known small leak, on the Schrader valve on the low side hose
> at the compressor.  I'm going to see if I can track down that nifty little
> tool that allows you to change it without evacuating the A/C.  For now, I
> have a plastic o-ringed sealing plug on it to help slow the leak.)
> 
> I did have a problem where the back of the high-pressure cutoff switch came
> off while I was mounting the high side hose, but it snapped back on without
> a problem.  The low-pressure switch is new.  Could that be the issue?  Or
> does anyone have any other suggestions as to why the compressor will not
> shut off? 
> 
> -Dave
>

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