On Tue, 2 Jun 1998, Don Lancaster wrote:

> The AC on my 87 Synchro stops completely six minutes into cooling normally, like as if the
> high pressure switch was trying to tell me something.
>
> After a ten minute shutdown wait, you can repeat the above as often as you like.
>
> Seems to drop out faster at hiway rpms rather than local traffic. Seems to get "supercold"
> just before dropout.
>
> Could this be the receiver/dryer full of grunge?
> Any suggestions?
>   Don Lancaster
>
       No. But the thermo-expantion valve could. It is located on the
evaporator. It is likely this is your problem. Check the pressures-
high to low side, to conferm this. Common with a system that has been
left opened.                   Eric