by geeves » Thu Jul 07, 2016 5:37 am
The fan in the heater box connects on the charge side of the alternator and the air con only works when the alternator is charging. Charging is detirmined by the charge relay.
If the alternator or charge relay have been replaced there is a 90% chance you will get the symptoms you describe especially if aftermarket parts were used. Much easier to consider it normal although if you have just had the alternator replaced you could try to convince the sparky its faulty but you could try 5 or 6 alternators before you find one that fixes it
Consider it the new normal
Sanding your knuckles before starting work can help. That way you cant skin them