So, after my E46 radiator expansion tank blew in spectacular fashion, the system has been fixed, refilled and bled.
Driving home from the Garage and about 20 mins into stop start traffic the Thermostat gsuge climbs up to 3/4, stops and starts to go down really slowly (estimated 10 mins back to normal). I "forced" it back in 30 secs but turning the interior heating on full blast.
I tested again later by leaving the car in the garage with all the same electrics on (aircon, lights, bonnet closed) and although no overheating occurred I notice the the front most fan (my BM has two, a rear fan and a more forward fan directly under the grill) never came on - presumably this is only for an overheat issue?
As the work was costly, could anything still be wrong? Could it have been some trapped air or something?[s][/s]
Any advice appreciated.