I think someone has previously posted info on their rear heater but here goes.....
Since we have had Dotty (2 years now) the rear heater has never worked.
As you can see there are also missing cables. Worth saving or disconnect?
I assume that the cable turns the water on/off?
There is a switch on the dash but nothing works. I am not desperate and may, as some have done, blank off the hoses and remove.
More room under the seat