Sorry for the oversight. I just noted that the title is 3000GT whereas the content has Montero as heading, so I am guessing that Montero is the correct vehicle you are refering to.
Attached is the wiring schematic and I need some details of the problem in order to understand it better.
1. Is the blower motor working when A/C is turned on?
2. Prior to this occurring, did the A/C system seem to work less efficiently?
3. Have you checked the freon pressure?
4. Does turning between ECO and A/C on the A/C switch make any difference?
Images (Click to enlarge)
Monday, August 29th, 2011 AT 1:30 PM