Paul wrote:
> My 1998 civic heater seems to be blocked somewhere. If I have the heater on
> cold, then the flow of air is good, but if I have it on fully hot, then the
> flow is very low.
>
> I am running with the control set to just below max temperature to get some
> heat out with some flow of air.
>
> I have changed the pollen filter, but this has not improved things much.
>
> Any ideas please.
>
>
air flow on full hot is not as high since air's having to blow through
the heater matrix. if the air's not getting hot enough, check your
coolant level [inside the radiator, not the expansion bottle] and make
sure the coolant flow valve is operating properly.