You could have a plug heater core. How many miles and when was last time you flushed your radiator system and put a new rad cap on? And a 50%/50% collant mix?after a long journey, knowing the engine is warm enough to have warm air coming through the vents. there doesnt seem to be any? what could this be? all 4 air flow speed settings work, but no hot air.
could this be head gasket? although no signs whatsoever.
any thoughts?
as i was saying, i cant see any signs of head gasket, the water coolant mix looks a bit old, do you think i should change it?, its done 145k miles. could it be pollen filter also?