1st gen A/C install...help needed

[400orbust]

I'm installing a factory a/c system in my 89 4runner and so far I have the evaporator unit in place but I can't find where one connector coming from the a/c amplifier goes. The a/c amplifier splits and 2 connectors go into the evaporator housing, one goes to the fan housing but I can't figure where the 4th one plugs into...it is a 4 wire plug next to my thumb in the photo. The amplifier plug is by my other fingers. The other plug next to the amplifier plug is for the ac switch. Anyone know where this plug goes to? Or can someone pull their glovebox off and see where this plug goes? Thanks.
ps my rig is a 22re

 

[fourwd1]

4 wires could be the fan speed resistor module.

 

[DrewL]

According to the wiring diagram in my NOS 4Runner A/C Installation Manual, on a 4x4 the four plug connector from the A/C amplifier goes to the Thermo Relay.

The A/C wire harness instructions read:

A) Connect the 4-pole connector of A/C wire harness to the original connector and route the A/C wire harness along the main harness.​

In the cryptic drawing the "original connector" appears to be under the relay box behind the battery.

I hope this helps!