Sorted it. It was the valve right at the back of the engine. Replaced with a second hand unit for £25 and it works fine.

Hi, thanks for the response, I did consider that but it doesn't look like the pipes have been disturbed at all. It does appear that either the valve is closed and stuck closed or the valve is being "told" not to open. I'd like to try and find out where the interior temp sensor is. I've now...

Hi there, Ive just bought a Range Rover l322 4.4 V8 and the heater doesn't work. The blower fan works fine and can be operated either by the auto switch or manually turned up and down however the temperature of the air doesn't get even slightly warm. The temp gauge reads temp normal with no...