This heaters turned out to be a little bit of a problem just thought you might be interested in the result.
The symptoms were "not very hot cab heater" . First thing I did was clean out the pollen filter.
Now I have airflow but it wasn't very hot still. So I now attacked the heating system. Obvious place to start, as the car was a 02 replace the thermostat.
This had the effect of reducing the effects of the heater, giving the symptoms of an airlock. The heater would get lukewarm, and then go cold. I attempted to bleed the airlock. As I tried to pull the hose off the heater control valve, the pipe came with it, the plastic of the heater control valve pipe was like eggshell. So do in due course a replacement was purchased. I took notice of all the warnings on the Internet about not using the very cheap valve's from eBay, etc and on Christmas Eve I purchased a Euro car parts heater control valve. This was about 7 pounds cheaper than the one they sell as OEM.
Fitted the new valve, checked operation, job done. Nice and simple. No airlocks great.
10 days later Wife complains "can't turn heater off". I check connections, and heater control works perfectly. Do a trip of 25 miles about halfway there the car heater really heats up and we can't turn the heat off!When we get to where we are going I check the connections on the heater control valve. I touch the body of the solenoid with my index finger and it hurts me. So I touch it again, it's bloody hot! I Spit on my finger and touch the solenoid body and it bubbles and spits as it boils. The car is now left for an hour, I set the heater control to mid way and it stays okay on the way home. It would appear that the heater controll valve solenoid is jamming open and overheating through the current trying to close it.
If I can find the receipt I will take it back and get the OEM one and pay the difference. Meanwhile I have an index finger with shiny skin.
Anybody else had this problem with this control?
Gary