Quote Originally Posted by niceguyeddie View Post
Update:

I changed the thermostat Sat am. I drove the truck around town Sat and Sunday and all has been well so far. I need to get her on the freeway. I'll probably drive the truck to work tomorrow. CEL is still on, I need to get it to a parts store and borrow a scan tool to clear the codes.
BAM! most excelente' Eddie... did the thermostat have weep/air purge holes drilled in it? or at least a single air purge hole? I think that most new units do nowadays... It helps prevent air lock on the stat...