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I am in the process of refilling the cooling sytem of my Derbi GP1, but hit a snag.

After a litre or so of liquid it is not taking more.  While I found no source about the capacity of the GP1's cooling system, the mechanically similar Vespa is supposed to be around 2 litres.  This suggests that air is trapped in the system.

What is best practice to get around this?  Brief running of the engine did not make a difference, and I am wary of overheating it.

There is an air bleed valve at the thermostat cover. 

Careful to be sure it's not leaking.....had to replaced mine with updated version. Gps imports part number 

Otherwise, methodically check each connection one-by-one to make sure they dribble. 

Kind regards, 

Mick

Thanks.
I have used the last option you mentioned, loosening connections to ascertain they bleed.