I have a 2005 Range Rover Vogue 3ltr diesel. Just done 110,000 miles running like a dream.
Changed the coolant at 100,000 miles and now cabin heat is limited. My mate has bled the system. Just come back from 600 round trip journey heater gauge steady at 3 oclock.
Any solotion? Heater was fine till we did coolant change... Diver Bryn

Previous Transport:
Honda CB250n
Toyota Starlet
Renault Fuego 2 ltr TX
Fuego Turbo
BMW 528i
Escort RS Turbo
Capri 2.0 L Ghia
Kawasaki GT750 P4
Mini Metro
Ford XR2
Volvo 740 TDi Estate
Mondeo Tdi
Volvo V70 Tdi
Mercedes E300 TDI
Mercedes E320 Cdi
Mercedes S320 Cdi
Land Rover Discovery 3 TDV6
Mini Cooper Diesel
Mercedes Vito Van 111
Range Rover TD6
VW Golf 2ltr GTD 2015 Year
2016 Audi Q7 Sline 3ltr 272Bhp

Got to be an air lock. You didn't mix orange and green did you? [img]http://www.fuelly.com/driver/rob2529/range-rover[img/]
04, 4.4V8, Vogue Oslo Blue with LPG.
"You can sleep in your car, BUT you can't race your house!!!!"

If something can't be fixed with a hammer....... You have yourself an electrical fault!

+1

It's the coolant that transfers the heat from the engine to the cabin heater, si it either means you have no coolant or an air lock that's stopping it circulating.