Latest update. I've had the climate control module out and found the cabin sensor fan clogged and not spinning. Did a good clean up, checked the thermistor for damage and it looks OK (if you need to replace one of these you will need a needle point soldering iron).
Reassembled and checked the fan, spins great. Out for a drive and the climate system is working good again in terms of blower fan control (this was a problem I didn't know I had until I started this exercise). BUT, switch to full heat and it still only gives luke warm (off cold) heat (blower fan revs up) even with aircon switched off its not good.
So, is it back to looking for an airlock or a blocked heater matrix (Assuming the flushing process has dislodged some crud) or do a Basil Fawlty (for those of a certain age group).
Interesting though!
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