If the heater core is really plugged, a flush may not work. If it is plugged because some smart person used stop leak, then flushing it will remove the stop leak and allow coolant to visit your floorboard.

If your car has an AUX waterpump like the 123, check it's operation as well.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D