W126 - no heat in floor...

[86560SEL]

I know there may be 100s of posts on this, but not sure where.

Since I am giving my mom my 300SEL and winter is here, I need to get the heat working properly for this cold natured lady.

For me, its fine, because heat does mostly blow out of the dash vents or defroster, but very little from the floor vents. I know this is a common issue, because my 85 380SE also had this issue, but it was worse, because I didnt get any air from the dash vents... defroster only.

I remember hearing something about some "pods" or something, but dont remember. Exactly what all steps and parts are needed to repair the no heat in the floor issue, on the W126 chassis?

Thanks in advance.