Peter typed:

"Only cold air comes out the center vents before about 2000 -- the vents
are shut off in heat mode."

I'm still...well, always, troubleshooting my HVAC and now there is a new twist. After driving for about 15 minutes with nothing on HVAC wise, I can start to feel a little wicked hot air at my feet and out of the center vents (thermometer in center vent reads 110 degrees) but it's just "seeping" out. I think it has lost it's mind.
Any ideas?

Thanks y'all.

Bob Rentfro
'77 300D 141K
Litchfield Park, AZ

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