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"Never Mind" as Gilda Radner used to say. :) I think there was just a bunch of air trapped in the heater core because he didn't drain and refill the coolant in the system. After a few more mornings of use and one of those being a short drive with the cap loosened it started to heat better and...

Mine is a 1990 F350 with a 460. Jim.....you don't get to brag, 'you got older stuff' with me. :) (Though I'm sure you can trump me with something in the back 40 rusting down to its frame rails.) I'll check the blend door just for fun. But, I figured, hot before aluminum installed, not...

F350 old heater worked great, just started smelling a sweet smell in cab when heater on and fogging window. Now the heat output is nowhere near as hot. I saw that he just clamped end of heater core hoses in engine compartment, replaced heater core, cut to fresh ends on hoses and re-installed...

Let my mechanic put an aluminum replacement heater core in instead of copper/brass. He said there would be less electrolysis issues. There is also a lot less heat put out. I would say by 40%. Don't do it.