DelSolOwner, wrote the following at or about 8/3/2010 8:35 AM:
Just a wild and crazy guess. Low refrigerant? Low pressure cutoff is
kicking in after the system runs a bit and shuts it down. Basically the
same thing will happen if you have too much refrigerant in the system.
It'll cool fine for a bit and then the pressure switch will cut it off.
Find an A/C repair shop (since you'll undoubtedly be using the old
R-12(?) refrigerant) and have them check it. Since it's intermittent,
it shouldn't be a big deal.
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