If anyone is willing to give me an idea about this, since it is not a
"Honda"... I have an Acura RSX-S with a heater problem.

I can let the engine warm-up to operating temperature (the temperature gauge
registers 1/3 deflecting as it always did)and I get no heat at the highest
temperature setting, manual or auto. When I drive off, I get lots of heat.

Is my water pump impeller damaged? My dealer says it could be a valve. The
coolant level is at the top.

Any ideas?

Thanks,

Dave M.