My 2000 had rusty coolant, failed bottle and rotted pipes to the heater core; also poor heat.
I fabricated a rubber hose and some copper stubs and flushed heater with air pressure and water from garden hose. Just let some compressor air in at about 80 psi...take it easy...thru a slit in the water hose and the mix of microbubbles restores the heater core.
The system is ok now, and the microbbbles were a great dislodger and restorer.
I think the problem started when the oe coolant went bad and the bottle failed due to the air leaking in and hurting the coolant. I learn that "special"
coolant is now admitted by ford to be no good. Sorry to say I have to live with the leftover rust forever despite my cleanup effort, altho sucessful.Its been 25000 miles. That coolant fiasco should have been compensated!!!Agree???
Has anybody else suffered from this coolant misadventure?