OK, I did it by the book: drained the anti-freeze, flushed the cooling system, refilled and let it run, adding AF when the level went down. Go to the top, and let it run, sealed the system and ran some more. Guage moved to mid-level and the fan turned on.
But, when driving, the guage goes to clod. Even if I idle it for 10 minutes, and the needle climbs 1/2 way, when you start moving, the guage goes to cold.
I removed the AF, replaced the thermostat, according to instructions and the Haynes manual, and filled, 'burped' and tested again.
Same results. Any ideas?