2001 grand caravan 3.3 motor/a.c. blows out good,switch to heat still blows out cool

SOURCE: 2001 Grand Cherokee Limited a/c Blower Motor

Check on Ebay for Jeep Grand Cherokee Harness Kit. The plug on your harness may be melted like mine was. I bought this kit, followed the instructions in his ad and it worked great. All I had to do was cut off my old plug and solder this one on. Even the wire colors matched so there was no guessing.

SOURCE: 2001 Grand Cherokee Limited a/c Blower Motor not working

Try wiggling the connector on your Blower Motor Resistor. They are known for having a bad connection and melting the connector. Check on Ebay, I bought a new harness kit on there. It was easy to install, just cut off the old connector and splice in the new. The colors match so there is no guessing which wire goes where. Only cost me $12 and saved me $300+ that the dealer wanted.

SOURCE: i have a 2000 dodge caravan, no heat

Sounds like the air "blend" door might be inoperable. This door opens and closes a specified amount to regulate the amount of either cooled or heated air, as requested by the climate control unit. If the door is continually in the position which is bypassing the heater core (cold setting), the air will not get warm regardless of the condition/operation of the heater core. I'd suggest having this component checked.

SOURCE: 2000 dodge caravan heating problems

if you are sure that your heater core is not restricted. then try to recalibrate the climate control panel. if your a/c system is not working then DO NOT ATTEMPT THE RECALIBRATION it will make your lights on climate control panel flash codes forever.
to reclaibrate the climate control panel just have the engine running. turn the mode to vent, the temp to cold, the blower on high, then press and hold the rear wiper wash and wiper buttons at the same time until the panel lights up then wait about 2 minutes for it to run completly when completed. turn off ignition and then restart the engine try to se if you have heat again. if it doesntwork post the codes it gives you after the calibration test.

SOURCE: 2003 Dodge Grand Caravan does

The problem is a bad transistor in the resistor module located in the air duct behind the glove box. Just replace the whole module. Mine was only $17 and a ten minute job.

Illb