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sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 21598
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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2003 Dodge Grand Caravan Heater/AC blower control switch

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2003 Dodge Grand Caravan: Heater/AC blower control switch only has high speed. Used to have 3-4 speeds.
Hello and welcome to JustAnswer!

This is most likely caused by a bad blower motor resistor. This is mounted to the heater box with two screws, right behind the glovebox door. This is what is responsible for stepping down the available current to the blower motor to give you the different speeds. The most common symptoms when the resistor fails is the blower motor either not working at all or only working on high.

if you have a voltmeter drop the glovebox down, unplug the resistor connectors, set the meter to an ohms scale and check for continuity between each terminal. If you find any with an open circuit the resistor is bad for sure.

If you don't have a meter or a test light you are pretty safe just replacing the resistor.
Customer: replied 6 years ago.
When you say "drop the glovebox down", do you mean the door or what? What does the resistor look like? Do I buy this from a dealer? Am I safer to just have the dealer deal with it?

If you're comfortable with doing some minor repairs you can handle replacing the resistor.

 

Drop the glovebox down. Open it up, and then release the top of it to drop the box completely down and out of the way exposing the heater box behind it. The resistor is mounted directly to the box with two 8mm screws and it will have two electrical connectors. All you have to do is unplug the connectors and remove the screws to remove and replace it. You can get one from a dealer or a parts store, either one will probably have the part in stock, and it will be cheap.

 

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