RRC, 3.9.
Noticed an potential heater problem now that the weather has started to turn cold.
Engine runs up to working temperature with no problems but the heater blows cold air when the vehicle is staionary and at tick over, rev the engine and the hot air returns and all is fine.
Water levels checked and ok with no leaks anywhere.
Seems there is not enough flow of hot water, could it be water pump or sticking thermostat ????
Any ideas would be appreciated, thanks
AlunP