Hope i'm not hijacking your thread, but same problem.
Heater was working fine then some weeks ago started getting cooler until now, 'nothing warm'. My mate changed the hbv at my insistance although he said the old one was working perfectly, which it was. Today he flushed out the matrix with a hosepipe, the water ran out immediately and was clean, still no joy. The top hose to the matrix seems to be getting warm/hot, but the bottom one feels cold ? What I have found confusing is, whatever steady speed I travel at there is just cold air at the vents, 'but', gun the old girl for a few seconds and we get warm air, turn on the fan and it just gets progressively colder, but if I drive erratically by continually gunning the engine, we get warm air almost continuously ?? As my Son was really cheesed off continually rubbing the ice off the inside of the screen on the school run today, any help would be greatly appreciated. Thanks.
