Fan for heater in 2002 dodge ram stopped working?

To clarify, the compressor and fan will run in defrost mode. The compressor and fan runs to dry out the air blowing onto the windshield.
Now if the condenser fan runs in "heat" you may have a problem with the fan relay or the main controller.

You probably have a plugged heater core. If one hose is hot, and other one is quite a bit cooler or cooler, then you have a problem with flow through heater core. Try flushing it. I hope that will help.

Good Luck!

pretty sure it doesnt have anything to do with subs unless the wired something wrong might have to take to shop to see if something wrong wid heater blower fan

sounds link the servo door has either broke off or is not working and it is stuck in a closed position

How was the heater core verified ?

Dear Madam or Sir,

the code stands for:

Heated Oxigen Sensor1, Bank 1, Heater Control - circuit low.

So the heating of the O2 Sensor is faulty, you should see a mechanic to fix it.

is this a problem w/ the interior vents? maybe stuck venting in outside air rather than from the heater box? did the heat only stop working after the radiator/hose install? if so, then you probably have a big air pocket stuck in the heater core.

check your antifreez . that would make check engine light come on and no heat

I have a dodge 2007 ram 1500...most likely its an RPM issue. The compressor requires a certain RPM to maintain the required pressurized vapor.

2002 Grand Caravan. The rear heater also has a resistor for the fan speed control.(3 speed) It is located under the rear passenger side plastic cover. You can take off the rear tail gate lower plastic piece and this will let you pull out the side panel. You can reach in and take out the two screws that hold in the resistor and unhook the wiring adapter. You do not have to take off the whole side panel as you can reach in from the back. The resistor unit can be bought at you local dodge dealer.