Hi Jeremy

Welcome.....
I will answer the questions which I know the answers to...
Most 928 owners go to Paul Anderson in Stroud, he races 928s, and its all he fixes as well, what he doesnt know about 928s isnt worth knowing to be honest...
People travel from all over the UK to go to him....and hes a really nice guy as well...
Your heater problem is probably a sensor..there are 2...1 outside in the alternator air ducting (easy to do yourself) and one inside (behind that little circular duct in the middle of the dash)...that one is an absolute pig to do lol...
More details needed of what it DOES or DOESNT do... ??
The belt/pump need changing EVERY 4 years (mileage does NOT matter) so you are correct they need doing NOW....
All the best Brett
