Hello. I have a L322 2008 diesel Range Rover Vogue. I have owned it since February and both the front and rear windscreen heaters do not work. I have checked the fuses but all good. Any thoughts please would be much appreciated.

You need to get to the feed wires at each screen to see if there is power getting there. If not work back through the system towards the relays. If you have power and ground at each screen. Then it could be faulty elements in each.

Thanks for the advice - will have a look at the weekend.

If you want to test the rear one quickly, you can take a multimeter and test continuity across the screen from each side and then measure the voltage at the screen. For the rear, you don't need to strip anything down, just put the probe on the heater element on the passenger (left side of the car) and earth it to a bolt where your amplifier is in the boot. With the car running you should see about 14.4v on that side. If you have the voltage there the screen is knackered (as mine was a week or two ago) and if not, then you can start checking the relays, fuses etc.

Remember, these things don't work without the engine running so if you do any checks with only the ignition on, you'll be chasing your tail. That's something I learned a long time ago and spoke to a friend who recently made the same mistake with his BMW.