Cabin heat coming in even with console handle down, Checked the heat valves Options

[oakdalecurtis]

I kept feeling a small amount of heat coming in on my feet even with the heat control down. I checked the cables and the heater valves underneath the car, it felt like they were closing when I manipulated them. I finally pulled the valves out, and one of them had a nut stuck in the valve gap so it wouldn't close all the way. No idea how the nut could have gotten there, but it's nice to drive now without the heater leaking into the cabin! Btw, I had no use for the disconnected CAT and EGR lights on the dash, so I black plugged one light and connected the other to the cabin heat switch. Now when I pull the console lever to get heat, a red light goes on in the dash to remind me that heat is on.

[Dave_Darling]

I remember that the flap inside the flapper valve is actually two pieces, riveted together. If the rivet fails the two pieces can separate, and that can send (at least some!) warm air into the interior at all times.

Alan Caldwell recommended using a nut and bolt to replace the rivet if the latter fails.

(Unless I'm thinking of some other valve that fails in this way....)

--DD