[Phid]

I've just sorted my heater out and plumbed it back in to the cars cooling system - it was previously by-passed. I've poured coolant into the heater core and into the input and output hoses and connected everything up. I've ran the car to temperature but I think air is trapped in the hose running into the heater valve, it being the highest point. That hose is not getting hot.

I guess it could be the heater valve not opening but in order to rule that out I need to lose the air - if it's there. Could I install some kind of valve in that highest hose to expel the air? Does such a thing exist?

When hot the system doesn't seem to be under that much pressure - hoses are easy to squeeze.

Previous owner installed a waterless coolant system (has special aluminium rad) and I'm wondering if this is not helping here. Maybe the water pump is struggling with the slippy coolant and I would be better off with an old school water / coolant mix?

A lot of points raised - any feedback much appreciated.
Thanks