Hi folks, On my drive to work this morning I noticed that the heating in the car was not as warm as it usually is. At first I thought I would check the coolant level - this was ok Then I thought I would check to see if the control (via wire) was actually moving the control on the matrix - it was! When the engine was not running, I got my home made filler (to raise the reservoir level) and opened the bleed screw at the top of the engine and I noticed that water came out steadily. - do I need to take the screw all the way out and look for bubbles??? So when I tested the heating again, I thought that I had cracked it, but the temp dramatically dropped back to cold again - this is something that can be repeated. Heater matrix shot? - or full with air ? thermostat? thanks in advance. Adrian