It is under the dash in the middle of everything. You have to fully tear down the dash. allow at least 8 hours and also get a camera and take a lot of pictures. You can put parts in zip-lock bags and lable as you go.
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If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired. Heater Housing
The heater housing is usually under the dash and must be removed to gain access to the heater core.
Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
The heater housing is disassembled to get to the heater core.
Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
Remove the heater coolant hoses.
Remove the cable and/or vacuum control lines (if equipped).
Remove the heater core securing brackets and/or clamps.
Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
it sounds like your heater core is leaking. Check to see if your coolant level is low. A radiator pressure test will show a leak. coolant may be dripping down from the heater air box drain hose. Replacement of the heater core is expensive. you can bypass the heater core, to keep you on the road, by looping one of the heater hoses back to the engine....but you will have no heat. Here are a couple of sites for reference;
You will have to remove console, and all the venting and cover to heater core. Then go underneath the vehicle and disconnect both coolant hoses. Then remove heater core. You can go to autozone.com and register for full free online repair manual for your durango with everything you could need.
well if the heater core is leaking then your coolant is leaking as well, heater cores leak on the inside of your car so your car will get water damage and will smell like antifreeze, so i wouldnt drive it
It's a big job. Drain the coolant down, recover the freon in the ac system and disconnect the lines and heater hoses. Lower the steering column, remove the instrument panel assembly, remove the heater housing. Split the case halves on the housing and there you are. Usually around 500 to 700 dollars at a dealership.