Wheres the plug for the heater air bleeding pipe mentioned in the 1.3 Manual

I'm flushing thought my coolant system and replacing the thermostat but can't find this so called "plug for the heater air bleeding pipe at the upper part of the engine" can anyone point me in the right direction? 1.3 efi.

Ta.

Asuming it's in the same place as the 993cc it is just above the rad under the bonnet got a spring clip and a rubber bung on it see top right hand pic on http://richstoys.piczo.com/?g=44000889&cr=1# although I have a quick bleed adaptor on mine.

Its not there, think my LPG system must feed from it, another spur off the system which probably doesn't help.