'92 240 A/C

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Joe D - 29 Aug 2006 19:41 GMT

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

Reply to this Message

c.fiedler@sbcglobal.net - 29 Aug 2006 23:10 GMT

>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
[quoted text clipped - 5 lines]
>Thanks,
>Joe

Sounds like it's low on refrigerant.

Chuck
Nothing but Volvo since 1974

Reply to this Message

Mike F - 30 Aug 2006 13:07 GMT

> 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
[quoted text clipped - 5 lines]
> Thanks,
> Joe

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.

Signature

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.)

Reply to this Message