My son has a 2004 Dakota with high miles. First experienced the heater/defrost switch wouldn't switch the air folw to defrost. Before we could fix, now blower motor doesn't work. Took the dash panel apart - no power on the back of the block on the blower switch. Fuses seem ok - I read about the resistor - haven'r checked yet, but could that cause the defrost switching problem also? Thanks.
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Do you have heat? Does the fan turn on? are you getting air from the defroster vents close to the windshield? If you have heat make sure the defrost control is working. I'd open the outside air vent and turn the blower on high speed. If there is no heat, the heater control valve is not working. Double check the radiator fluid tank, make sure you have enough fluid (antifreeze) Low fluid levels can reduce the hot water flow to the heater coil inside the car. If there
is no air flow through the defroster vents you may have a problem with the fan control, or the fan motor. Good luck.
What is happening here is that the faster the heater blows air through the fan, the more it cools the liquid in the heater core, and so heat output is reduced. The root of the problem is either the engine is not warming up enough, or the heater core, and/or heater core lines, are plugged up, not allowing the water to circulate properly in the heater core. Here is what I would try.
1. Top off the radiator and overflow.
2. Is the engine warming up properly? Is your temperature gauge showing normal temperatures? If it is not, then replace the thermostat.
3. If steps 1 and 2 do not solve the problem, get the vehicle in a shop, locate the heater core lines, take them apart and flush out the heater core. Look for blockages in the fittings. Do a flow test on the core. It may be clogged and need to be replaced.
Sounds like a card located under dash behind your blower motor, on passenger side.When card starts going bad you will only have off and high (for awhile), then none. change the card, this thing controls your speeds on the motor at your control on dash. I have a 2002 Dakota had same problem... but keep in mind not all Dakotas have this card.