Help! Climate control issues LR3
Hello, I have a 2006 LR3 HSE. The climate controls have a weird problem. With key on / engine off the controls work perfectly front and rear, everything responds and blend doors / temperature all work fine. Once you start the vehicle, the climate control turns on and is set to whatever it was set to when the key was on. The blower motor speed control, seat controls work normally but the temperature control and blend doors dont respond to the controls, the buttons light up but nothing changes. The only way I can force it change is by activating the heated windshield which will "shock" the system into working. I discovered the controls only respond under heavy electric load when the voltage dips below 13V. That's why they work when the heated windshield comes on. As soon as the voltage goes back up past 13V the controls stop responding again. I have changed the alternator and battery so I known it's not a charging issue, I have swapped the climate control module with a know working one and I have changed the relays as well. I am at a loss here. Any help is appreciated.