Hi,
I've got a 1994 e36 318i, and am having a problem with the heater.
It normally just blows cold air, occasionally warm or hot, this is with leaving the temp setting at MAX.
I think there's a v slight leak in the cooling system, whilst hot I can hear a fait hissing noise near the thermostat. I'm going to have a new thermostat and cooling flush done this week, if the heater problem continues, what shall I try next? Could the heater valve be stuck or blocked so that no coolant's going to the heat exchanger?
Please don't tell me its a head gasket, I've had enough of that with a Rover K series engine in the past!
Cheers, Nick