Highlander no heat A/C will not turn off

Jabberwo

Hi, my 2006 Highlander suddenly stopped heating last night. The A/C light comes on without being touched. No amount of pushing it will turn it off. The recirculating air button light is also not responsive; it mostly stays on except when I move direction knob to windshield.

I found the long post regarding A/C not coming on and the loose knobs problem. I took all three knobs off and tightedtened down the nuts behind them. I moved all three with my fingers while knobs were off.

Still in the situation where A/C is blasting on a 20 degree night. I don't think the heat is even on while knob is turned to high heat, the air is too cold. Did a horrible job of clearing the fog off the inside of the windshield.

Any ideas besides the $1,000+ gouging by the dealership?

thanks,
Jab

Jabberwo

Update. Following the directions in the long post linked earlier, and a very helpful YouTube video, I got access to the environmental controller. 

All the ribbon cables look properly connected, nothing broke or loose. 



Anyone help with with some other ideas?!

thanks,
Jab

Jabberwo

Seems while it looks like I linked the other thread, I might have formatted the "Simple HTML" wrongly and can't figure out how to edit previous posts. So here's the link to the other thread:

https://forums.edmunds.com/discussion/8595/toyota/highlander/toyota-highlander-heating-ventilation-and-air-conditioning