On 7/19/05, TJ Hannink <tjhannink@yahoo.com> wrote:
> My high speed fan came on this morning for a minutie or so when the temp. needle when above the LED while sitting it traffic, but the A/C was still blowing cold air.
>
> AFAIK the only high pressure "safety" valve in the A/C system is the solder plug in the receiver dryer.
>
> Tim

Tim,

As I said earlier in another A/C thread:

With the A/C on, the radiator fan runs at slow (Stage 1) speed.  When
the system detects a high refrigerant pressure (210.2 PSI) it switches
the fan to medium (Stage 2) speed.  When the pressure is reduced to
174 PSI, the high pressure switch opens and the fan returns to slow
speed.
-------------------------------------------------------------------------
The coolant temperature switch in the radiator (at 105 degrees F) will
switch the radiator fan to high speed and cut out the A/C compressor.

Note: This is on the '86 and up, YMMV and no telling what the PO
jury-rigged in there...
--
Don in Reidsville, NC
1986 Kawasaki Concours
1988 Vanagon GL (Sylvia)
"Why do they call it a fixed income, if mine is always broke?"