A non computer-literate friend with a '07 V70 is having a problem with heater control. It will only blow hot with the control knob in the far clockwise position, otherwise only cold. I have vacuumed and blown lint out from around thermistor via the small grille opening on the panel. That didn't fix the problem so trying to remove the panel/module itself to replace it with another unit. The whole radio+panel comes out as a unit but can't seem to detach the ACC module from the radio/housing. I can see the 3 tabs that prevent the module from pulling away from the rear housing for both the module and radio but releasing those doesn't seem to release the module. I don't want to break anything so please tell me what I'm missing. THANKS!