Trinary switch location for my dash air

[Fairgrove]

I have a 2003 Monaco Executive and I am trying to locate the trinary switch for my dash air. I can get the compressor to run and the clutch to engage by applying voltage to the A/C relay. The schematic shows that the relay is brought in by the trinary switch. I have found the drier, expansion valve and the temperature switch but not the trinary.
Can anyone give me a direction to look?

[jferre9570]

Trinary Switch is probably located under the front cap near the evaporator core.

[camperkids1025]

fischer wrote:
the trinary sw is on the high pressure side on my jeep the low pressure sw only has 2 wires.and shorts across itself at 22 lb
If you unplug the low pressure sw at the dryer and short across the two wires that will tell you if your low senser is bad..

Or that test would also be an indication of low freon.

[fischer]

the trinary sw is on the high pressure side on my jeep the low pressure sw only has 2 wires.and shorts across itself at 22 lb
If you unplug the low pressure sw at the dryer and short across the two wires that will tell you if your low senser is bad..

[gsander1]

Your trinary switch should be on the drier.

[Gjac]

Until someone with your chassis posts maybe this will help you. On my 1995 P-30 chassis the trinary switch is about 2 in. long and 1 in. in dia it has 3 wires on top with spade connectors. I can't remember if it is on the low pressure line(I think) or the hi pressure line. I can look tommorow if need be.

[teddyu]

Could this be the temperature control switch in the ventalation module? JM2¢...