I replaced the coolant bypass adapter and performed bleeding as per instructions. No heat coming from the vents. Repeated the procedure , this time squeezing the upper radiator hose. A bit of improvement - got heat when RPMs are above 2,000. BTW, I installed a bleeder hose to from the adapter. So the next time I opened the expansion tank cap and added coolant through the bleed hose. the expansion tank overflowed, at which point I closed the pressure cap, and the bleeder hose overflowed. So I closed everything and drove car around. No improvement. I parked with car running and cracked opened the pressure cap - a few bubbles came out. closed everything and still no heat below 2,000 rpms. Am I missing something?
UPDATE - Drove the car on some errands - about 20 miles. The system finally drew coolant from the reservoir and I get heat as normal. So, the answer for bleeding is do whatever you can in your driveway, then drive around and it will fix itself. I love Ford....