Hi,
New to this, but here goes. I have a Range Rover HSE auto, I cannot get the heater to come on. it seems to be stuck on - 40 which i think must be the AC.... Ive tryed to set it but it just blows cold ..

Didn't think the HEVAC display went that low. Could be a stuck blend motor. Put the HEVAC in manual mode and drive both temperature controls from LO to HI and back a few times to see if it frees them. Do this with the aircon (A/C) button on the HEVAC OFF (Light above the switch ON)

Hi, thanks i will give that ago.......I will let you know

I recently had a fault with mine. It displayed -40 on the unit but wouldn't blow any air at all. Made air hot and cold but only if I drove fast enough for it to be drawn in by vehicle speed.

After months of relay/fuse box/ outside temp queries it turned out to be a loose wire on the rear of the HEVAC control unit. Loose wire plugged back in, all works perfectly. No book on display, reads outside temp accurately and blows hot or cold air conditioned air...........If only all issues were that easy to fix!

Check behind here first.