1999 dodge durango has no power to sterring colomn, doors,windows,seats or headlights. i was changing heater core n that problem occurred? looking for answers.....
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Before resorting to replacing the heater core, first verify that the thermostat in the engine is operating properly. Sometimes the thermostat will stick in the open position. When this happens, the coolant does not get hot enough to provide sufficient heat. Also check to make sure that the heater core is not clogged up with rust or other debris. You can do this by disconnecting the heater hoses from the heater core [done from under the hood]. Place a garden hose against the upper metal tube and turn on the hose. Water should come out the lower hose without a lot of restriction. If debris or rust comes out with the water, flush the heater core out, using the hose, until there is no debris and no restriction in the heater core.
Replacing the heater core is a big job. I would suggest that you entrust this to a pro, unless you have lots of experience working on cars. The video linked below gives an outline of what is involved. See
blend door is inside the heat/ac box that contains the heater core that you changed. It is vacuum operated, so check all of your vacuum lines. There is a vacuum line that goes thru the firewall, right above or below the 2 heater hoses.
The stuck door could be the problem. I had that happen on a Dodge sedan I once owned. I don't remember how but I got into the system and discovered a door that was just flapping back and forth thus giving me alternating warm air or no warm air at all. It might have been that the cable had come off where it was fastened to the door.
Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door. The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents. When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear. You can do an internet search for "repair durango blend door" for more info.
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;
Remove the door panel and find the window motor
Unplug it and using a separate car battery run cables directly to the window motor
When you switch the polarity the motor will either bring the window up or down or if noting happened change the window motor and window regulator assembly.
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.
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