Winter desiccant while parked

[Charles Freeborn]

I routinely place a "dehumidifier" on the passenger floor of my car when it's parked. The power comes from an extension cord that also powers my battery tender.
This got me to thinking - what if one were to tap into the heater tubes that run through the rockers back where the heat exchangers connect and with a small heater and blower (something along the lines of a hair dryer) blow warm air through the stock heater plumbing and out the footwell and windshield defroster vents? The dryer would be inside the cab in the rear seat area so the air would be re-cycled through the cab and not lost. Would this constant warming of the fixed tubes in the rockers ward off moisture and thereby discourage rust from forming along the rockers?
I'll be doing rear seat delete soon so the time would be right to do the plumbing.
Just a thought...

[flat6pilot]

Depending on how cold your garage is, the warm air may actually attract moisture and cause condensation throughout the vents/car.

Generally, to dehumidify you introduce cold dry air into a system. That's probably over simplified, though.

[Jack Stands]

I found that the cold garage in the winter does not need dehumidification as much as we do in the more humid summertime. I put some boat desiccant tubs from West Marine into the interior with the windows up and heat/cold air ducts closed for the summer when I can't drive the cars. I'm amazed how much humidity they attract in my Wisconsin garage!

[RSBob]

I put a container of Dry-z-air in the cabin and it's quite good as evidenced by the amount of water I pour out of its catch basin monthly. I do the same with the Jetta banned to live outside in shame.

[OldSpool87]

I'm in the Northeast and have used desiccant buckets in the past with success. I'd be a little concerned if making the cabin too cozy and inviting to critters by heating it.