'94 Grand Caravan Heating Problem

Well, It's like cold here in Pittsburgh and the van does not have heat.
Checked all the usual things, fluid, hoses get hot, but no hot air comes
out of the vents. Had to close loop the back heater, because the pipes
rotted out, does this have something to do with it or is there something
else?

 

If you are referring to the auxiliary heater in the rear, it wont cause a
heater problem in the front
by bypassing the rear heater core,It may cause the van to take longer to
heat up then normal.
In extreme cold weather you wont get as much heat output as fast either .
You can check for a fault code 17 in the computers memory, that would
indicate a stuck open thermostat which will give you low heater performance
or there is a possibility that the blend air door is out of adjustment.
If the temp feels the same going into the heater core as it does coming out
then it may be a blend air door adjustment. Do a search on TSB 24-05-94 if
it is the blend air door this will explain in more details
Glenn Beasley
Chrysler Tech