No coolant in heater pipe at idle!

[cederholm]

In my quest for heat I've discovered almost no coolant exiting the heating tube at idle. This would be BEFORE the "T"s. I removed both Ts and with a full radiator no coolant would come out at idle. It would at a higher RPM.

What to the Cruiser gods say? Plugged lines? Bad water pump? The truck runs at the proper temp all day long - even in heavy traffic.

Thanks,
Carl

 

[2001LC]

How often do you flush and with what?
If not losing (leaking) coolant & flowing through upper radiator hose at normal operating temp, then water pump good.