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No heat at idle with new heater core

Nightflyr *
Richard Kirshy

It probably does have air trapped how can I get that out?
In general:

Yes I do notice some Coolant loss over time.
Is there a visible signs (puddles) or it just mysteriously disappears?

I have not done a combustion gas test.
Well that will depend on the answer above

I haven’t checked the radiator cap but I’ve never seen any leaks from it if that’s what you mean
I meant is the seal in good shape and does the relief spring function.