Hi All,

I have condensation building up in the people compartment while driving.
The front heater is disconnected (it started to leak so up under the spare
tire I disconnected it and routed it back into itself.. not a possible
source) I've changed the core, the hoses and have swapped it with a good
unit and it I still get condensation when I run the rear heater.  When idle
the van in the driveway, windows up, for 30 minutes + no condensation.

Could the blower be sucking vapor in from outside????

TIA

Jere