I have a 2001 Black Durango that had the same problem. There is a resister to the right of the ac/heat blower (underneath the dash on passaenger side). This needs to be replaced. You might want to replace the motor as well. Both are real easy. I had replaced the resister first and everthing worked fine for about 6 months and then my ac/heat would only works on high. I replaced the motor and now it works just fine. The resister was about $15 at dealership and the motor is prob around $40-$50. I hopes this helps. Good Luck!
There is a harnes that connects to your blower resistor if the contact is contaminated in ant way it will prevent contact and the fan will not work. This looks like it will be a recall problem for Chrysler in the future. This area gets so hot it melts the plastic that covers the wires. Guess they are waiting for a couple fires first. This is on the passanger side directly above you left foot when sitting in the seat. wiggle the wires and it may start working for you. The dealer says this is because the fan is drawing too much power and therefore burning out the wires and contact.....I say recall it and fix the problem Chrysler
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I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.
there is usually a fuse for this should be in the line up front somewhere as an accessory item and should be at least a 15 amp..you can check the blower separetly and see if it works..ooppss..check the heater hoses for shut off water valves.. there are 2 , one on each hose(usually under the hood) open these up and the heat should transfer..
I would start with the rear blower motor resistor, the resistor is what controls the speed of the fan, the resistor is located in the rear heater box near the blower, you will need to remove the right rear side panel to access the heater box. start with that
The rear A/C system in the Durango has its own AC and heater core like the front system does. There is a plastic flapper valve back there that either directs the air to one or the other depending on what you have selected up front.
While the part is not too expensive, the labor to get there requires removal of the interior panel on that side which is not fun. It can be done though.
Have the front heater core flushed ,since there is heat to the rear the thermostat is fine so it could be plugged.If the fan works on no speeds the check the fuse for the heater fan,if it's good you neerd a blower motor.
I recently had a simular problem...try to follow the heater hoses that come from the engine and go into the firewall to the heater core... one of the 2 hoses connects to a plastic valve right before the firewall. This valve shuts off the flow of hot coolant into the heater core when heat is not needed.. Look carefully at this plastic valve, there is a wire pull cable with a small loop at the end that connects to a lever on the valve. Have a helper work the heat controls and make sure the cable pulls on the lever at the firewall valve...I've seen some cables disconnected. Hope this helps with your diagnosis.