Heater problem but demister OK

Ponderosa · 11th January 2017, 09:45

My Rover 75 Diesel purchased by me from new on 2001 has a heater which does not work but the demister does work.I assume that the thermostat is OK. If it is a vent problem what needs to be replaced or repaired.

roverbarmy · 11th January 2017, 12:13

I take it that you have tried the adjuster wheel (under the clock) in the centre of the top dash that controls air flow from outside/inside?

It took me a while to suss out what it did - until the winter came! Brrrrrr!

T-Cut · 11th January 2017, 17:58

Quote:

Originally Posted by Ponderosa

My Rover 75 Diesel purchased by me from new on 2001 has a heater which does not work but the demister does work.

The demisting system works very well without any heating because it dries the incoming air. If the engine is cold or the heater matrix is silted up, the demister will still work fine.

Quote:

I assume that the thermostat is OK.

Not from what you've described, for the reason given. If the heater never heats, it's either because the matrix is blocked or because the coolant temperature is too low. I'd plump for the thermostat being the prime suspect.

The best way to determine this is to check the engine running temperature by driving with the trip screen diagnostic showing the real time data. You need it close to 90C if possible. That's why the in-line stat is so popular.

EDIT: I see you're a newcomer, so these links might help.

Diagnostic Mode: http://www.the75andztclub.co.uk/foru...ad.php?t=55585
For this, you need section 7.

In-line Thermostat (lots of stuff): https://cse.google.co.uk/cse?hl=en&c...e%20thermostat
TC

11th January 2017, 09:45	#1
Ponderosa Newbie Rover 75 Diesel Tourer Join Date: Jul 2016 Location: Leighton Buzzard Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Heater problem but demister OK My Rover 75 Diesel purchased by me from new on 2001 has a heater which does not work but the demister does work.I assume that the thermostat is OK. If it is a vent problem what needs to be replaced or repaired.

11th January 2017, 12:13	#2
roverbarmy This is my second home Roverless + 1.7D Sportage Join Date: Aug 2014 Location: East Norfolk Posts: 7,050 Thanks: 729 Thanked 2,021 Times in 1,449 Posts	I take it that you have tried the adjuster wheel (under the clock) in the centre of the top dash that controls air flow from outside/inside? It took me a while to suss out what it did - until the winter came! Brrrrrr! __________________ Oil in my veins! Last edited by roverbarmy; 11th January 2017 at 12:24..