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Water valve regulates the temp.

and a condensate drain line out thru the floorboards.

Could be missing a thick foam rubber gasket....

I'd disconnect the hoses, open it up to see what's in there, and report back....that way we all can learn without you having to risk breaking your heater core with an untested cheat.

Internet pic of same HVAC control head as mine. Pic of my water valve.

Nope. Temp is regulated by throttling water flow thru the core. All HVAC air passes thru evaporator and then heater core.

My Chrysler has the manual system and the heat is quite adjustable with the water valve. There is NO blend air door. The water valve also has a vacuum pot ten times the size of the one I mentioned earlier in this thread.

That water valve you posted will not be good for making finite adjustments to heater output. Those small vacuum chamber valves work more as an ON/OFF switch.

Use a small mirror to look at bottom of water pump snout...if it's leaking from the weep hole you will see it.

Google "mopar 440 heater hose nipple" and you get something like this in return... Heater Hose Nipples

Vibration

Leave the belt on till you get the bolts cracked loose.

Water valve (Heater Control Valve) can make a heck of a mess too. Mine just let loose at the end of the season...Old Faithful,only green and foaming.

This thread got me thinking about my clutch a few months ago. Mine's more than old enough to go drinking, might be time to replace it. Did some digging in the Hayden catalog and found 2747 listed as the heavy duty clutch. Bought one, and does it ever get the air moving! So much so that after a...