Water Vapor is a Coolant

Water vapor is a coolant.

Water Vapor is the most abundant greenhouse gas in the atmosphere  - The NOAA

GreenHouse Gases(GHGs) are supposed to TRAP heat are they not?

So how come they don’t?

IF 'greenhouse gases' absorb but do not emit, then they can’t be regarded as radiative heating agents for anything. On the other hand, if greenhouse gases do emit what they absorb, then they can’t be said to “trap” radiation. Alan Siddons

Maybe GHGs don’t trap heat!