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Hi Kathy.
this is what i found from the internet.
Usual problem with microwaves not heating would be busted diode form the high voltage capacitor to the chassis. In some models, there is also a fuse from the transformer going to the high voltage capacitor. These two parts are the cheapest that you can replace. If the unit would still not heat up, then the next in line would be the magnetron or the high voltage transformer which is no longer worth to replace because of its price. They cost almost near the price of a new unit.
Just be careful on working with microwaves. They do store high voltage even though they are un plugged for a long time. Specially the high voltage capacitor that you need to discharged first by shorting the two terminals with an insulated screw driver and shorting both terminals with the metal tip.
If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.
You should have a high speed blower relay that provides power on high, and the other speeds go thru a resistor.
The problem could be the actual fan control switch, or the resistor.
This depends on what type of heat it is and what you are heating. If it is your car's heating then you have to wait for the car to warm up before hot air blows out.--------------------------------------------------------------------------------------- digiprog 3
The blower motor works on high setting ONLY when the blower resistor is
bad. The blower motor resistor is held in place with 2 screws and
attached into the heater housing under the right side of the dashboard.
You can identify the resistor by the big wires that are connected to
the connector. If this heating/cooling system is the auto temp type,
the part is a bit high on the price.
You need a blower motor resistor,and the heater blower motor should be checked for high amp draw. check Napa for the part or go to Dodge..prpbably about 60.00 dollars.
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