Compressor won't stop

Folks, my ac was not cooling so took it to a non-volvo repair shop up
in the woods where we were camping. Now it cools really nice, but I've
noticed that my compressor won't shut off. One of the other campers
had a psi gauge so we hooked it up to the low pressure in valve and
reading was: 40 down to 30 and up to 40 and down to 30 and so on (with
ac at full blast), never stopping (though we only ran it 5 minutes
afraid to jeopardize the comp).

Should the compressor run continuously? Is it normal? It is safe to
run the aircon?
using R134a. volvo 850 1996

 

I had a similar problem.
I was told the AC/heater control unit i.e. the set of switches that
control the AC needs to be changed or the switch [0,1,2,3,4] which
controls the speed of the fan even when it is at 0, the vents would
get you cold Air. So, during the winter month, I would unplug the
electric connector of the accumulator to stop the AC system from
working.

Changing that control unit is not easy and you will never guarantee a
good replacement from a UPull it yard.

So, I am living with it. I hope there is a better solution.


--Hameed.