I've just bought an A4 1.8 TQS and it's not getting up to temp on the gauge (very low or somethimes not registering). As it's low on coolant I need to top it up and make sure theres no air in the system. Hopefully it's just an air lock or something. Otherwise I'll have to start looking at the thermostat and water pump.
Can anyone tell me the procedure for bleeding the cooling system ?