AC only works in defrost mode. 98 Land Cruiser 100

[sparkymike]

I have a 1998 Land Cruiser 100 series and I am having issues with the air conditioning (AC). The AC will only work if the position selector is in the defrost position. It will not work in Auto, Chest, Chest/Feet, or Feet only position. It also only works with the air recirculate switch is in the open, outside air, position and will not let me put it in the cabin recirculate position.

I figured it was probably the control module so I bought a used one and installed it. Doing this did not change anything so I am fairly confident it is not the module.

Has anyone else had this problem or have an idea of where to start? Anyone know where I can get the wiring diagram for the control module?

 

[vcheng]

The Defrost position runs the AC by default. It also locks out the Recirc position. The other modes comes through the AC control module.

 

[sparkymike]

The Defrost position runs the AC by default. It also locks out the Recirc position. The other modes comes through the AC control module.

I understand that. The recirc position will not work in any of the vent/heat modes either. It only works in the open recirc position.

Any idea on how to go about testing that and the AC control module?

 

[vcheng]

I understand that. The recirc position will not work in any of the vent/heat modes either. It only works in the open recirc position.

Any idea on how to go about testing that and the AC control module?

Do you have access to Techstream?

 

[sparkymike]

Do you have access to Techstream?

I do not.

 

[vcheng]

I do not.

It would help. You can run a few active tests on the AC components to pinpoint the problem a whole lot better than throwing parts at it.