Blower Motor Stays on High—Caravan, Voyager, T&C with Auto Temp Control
If your blower motor only has high speed you should suspect a burned out blower motor resistor—unless your minivan has auto temp control (climate control). Those systems do not use a resistor. They vary the fan speed by sending a varying voltage from the temp control to the blower motor power module.
To test the system, connect a digital volt meter to the dark blue/light blue wire at the blower motor power module and see if the voltage varies as you change the fan speed with the control knob. If the voltage varies, then the control head is sending the proper signal and the blower motor power module is bad. Replace the module and you should get your blower working properly again.
Find a blower motor resistor for your vehicle
Find a blower motor for your vehicle
For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.
If you just need information for a single repair and want to save money,eautorepair offers a lower price 1-week subscription for only $11.99. Or, if you’ll be working on this vehicle in the future, you can buy a 1-year subscription (Alldatadiy.com for $26.99, or eautorepair.net $29.99)
© 2007 Rick Muscoplat
Alldatadiy.com
eautorepair.net
Both Alldata and Eautorepair offer professional grade shop manuals at a price you can afford. Check them out!.
Hover your mouse over the REPAIR ARTICLES tab at the top of the page. The click on DIAGNOSTICS to search by SYMPTOM, TROUBLE CODE, or read TECH TIPS on how to diagnose a problem
Click on MAKE an MODEL to see all the articles I’ve written for your vehicle
Click on REPAIR TOPICS to read individual articles written for specific automotive systems
If you’ve had your car scanned and know the trouble code go to TROUBLE CODES
Here are some quick links to speed up your research
Click on the link below for speedy navigation:
ABS issues, how to bleed ABS brakes
Alternator issues or how to test
Belt diagram or serpentine belt issues
Brakes, brake issues, what kind of brake parts to buy, ABS issues
Car Alarms or Antitheft systems
Cooling system, Water pump, What type of coolant to use
Firing order, cylinder layout, finding #1 cylinder
Oxygen sensors, How they work, How to change, How to test
Window issues, power window motor, replace window regulator, glass adhesive
96 Grand Caravan heater blower only works on high and wipers will start at randem times.
The two problems are not related. Replace the blower motor resistor to get all fan speeds back. Read this post for wiper issues. Could be a bad steering column switch or bad relay–or corrosion in the junction box.
I have ATC in my 02 Town & Country. The motor contoller installs in the duct behind the glovebox, the same as a traditional resistor pack. As Rick states, it uses a transistor to control the current to the blower motor. The new model has round pins on heat sink instead of the triangular fins of the original design. I assume the new one is more robust, but both can overheat and fail if the cabin air filter is clogged, so change that first. A quick web search can find detailed instructions and photos for the repair. I recall the new one cost me ~$45 on ebay.