Hi guys,
The car heater is blowing cold air, ive had it working a couple of times but it always goes back to blowing cold air.
First thing I did was clean that pipe filter located near the 4 way valve, worked for a while and then back to blowing cold.
Second thing I did was remove and strip down that four way valve giving it a thorough clean, worked for a bit then back to blowing cold.
I've tried forcing coolant through various pipes to blow out any air locks. While I was doing this I noticed another thermostat located at the back of the engine mounted on the gearbox.

Is that the problematic one?

Some guidance on how to replace or better still does anyone have a download workshop manual?

Any guidance will be great.

Thanks