'92 240 A/C

  • Thread starter Thread starter Joe D
  • Start date Start date
J

Joe D

What on the '92 240 cycles the compressor, as there is no temp control
(cycle timer) and only an On/Off switch. The A/C on a 84 model I owned
had a cycle timer control. My 740 cycles, but the '92 240 my son
recently purchased runs continuously. Think this may be a problem, as
the evaporator and the freon lines ice up and he needs to turn the A/C
off to defrost.

Thanks,
Joe
 
What on the '92 240 cycles the compressor, as there is no temp control
(cycle timer) and only an On/Off switch. The A/C on a 84 model I owned
had a cycle timer control. My 740 cycles, but the '92 240 my son
recently purchased runs continuously. Think this may be a problem, as
the evaporator and the freon lines ice up and he needs to turn the A/C
off to defrost.

Thanks,
Joe
Click to expand...
Sounds like it's low on refrigerant.

Chuck
Nothing but Volvo since 1974
 
Joe said:
What on the '92 240 cycles the compressor, as there is no temp control
(cycle timer) and only an On/Off switch. The A/C on a 84 model I owned
had a cycle timer control. My 740 cycles, but the '92 240 my son
recently purchased runs continuously. Think this may be a problem, as
the evaporator and the freon lines ice up and he needs to turn the A/C
off to defrost.

Thanks,
Joe
Click to expand...

The A/C system on the '92 is of the same design as that on the 740,
whereas the A/C on the '84 was a different type. On the '92, look for
the pressure switch on the receiver-drier. This is what controls
evaporator temperature by not allowing the pressure to fall below
approx. 25 psi. With the A/C running, pull the electrical plug off this
switch and see if the compressor turns off. If it does, then you need a
pressure gauge on the low side to monitor the pressure. If it doesn't
then you have a wiring problem. On the bright side, there's a valve
under the switch, so it can be changed easily without discharging the
system.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
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