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The blower relay is for high speed fan only most of the time . Do you know how to test electrical circuits ? It sure cuts down on buying unneeded parts . Here watch this video , this is a Chrysler vehicle . Don't know what you have , doesn't matter . They all work pretty much the same . I suggest you watch a few other trouble shooting videos as well .Is Chrysler Blower Motor Test subscriber requested video This next vehicle is a GM product , this one uses a relay for high blow only . Blower Motor Problems Auto Repair Help
Hello from cold Kentucky. The system uses a fan switch, resistor, and probably a high blower relay. In the high position, the switch powers a relay that powers the blower motor. Any lower speed goes thru the resistor. The resistor is on the firewall or under the dash depending on if the truck has air cond. You can look up a blower resistor on the auto parts websites to get a visual.
Thanks for the opportunity to let me help. The blower control switch in your vehicle also uses a blower relay. This relay is generally located on the firewall on the passenger side near the heater fan. You can also look in you vehicle owners manual for the location of the blower relay, it may be also be located in the fuse and relay box under the hood. Generally speaking if the highest setting doesn't work on a GM vehicle it is a high blower Relay. This item is not expensive and can be purchased at most all you local Auto parts stores. If you have a Napa, Orielly's, or AutoZone these stores will also likely help you in the location if you are unable to locate this relay. Here is a general picture
The installation of this relay is either to remove from the fuse box, or if located near the heater fan housing then you will need to remove the mounting screws, remove the wiring clip, then reverse to install.
I hope that this has helped you. D.R. Wilkins
Three possibilities. AND all you can do yourself!
1. Hi/Low Blower Relay. However these usually fail on low and works on High.
2. Blower Control Switch.
3. Blower Motor Resistor.
If you do not have one: buy a Voltmeter, available for $6 at Walmart.
If you do not have one: buy a Haynes or Chilton Manual at most auto parts stores for $20-$25 dollars. I say this because you are obviously going to keep this vehicle. It will have most of the information with pictures to assist you.
Quickest way to determine which one?
Finding the Resistor....Go on line to autozone.com or advanceauto.com. Answer the questions on year, make, model and engine and go to "look up parts" or click on "Replacement Parts".
Pull up the Hi/Low Blower Relay.
Know you know what you are looking for.
This Relay is located near the Blower Motor.
The System goes: Switches, Relay and/or Resistor, Motor.
Unplug the electrical connection from the Switches going to the Relay.
Turn the engine on. Turn the Selector to Low and using a voltmeter, check for voltage coming from the Switch. Turn to High and rechaeck for voltage coming fom the Switch. No voltage on High? The Switch is bad.
Do the same with the Relay to Resistor connection and or Relay/Resistor to Motor connection. Check the Low and the High voltages.
Let me know if this helped or if you have additional information or questions. Feel free to contact me at FixYa.com!
It's common for the blower motor speed resistor and harness to melt causing your blower to only work on high and check the blower motor relay. The relay may have melted also causing the 12 Volt power to still be supplied even though the vehicle has been shut off. Good luck and you can but the parts needed at most Auto Parts store like Auto Zone, but i believe the GM parts department has the resistor and wire harness kit to ensure all the parts that may have been damaged due to the heat built up by the current used to run the blower motor on hi. Good luck and keep me posted, be glad to know you have your truck running 100%
Your blower resistor is bad. It controls the mutiple speeds to allow you to go from low/med/high. When it goes bad you get one speed or no speeds....It's about $20-$50 at any local auto parts store. It mounted directly to the speed switch or on the heater plenum unit on the passenger side behind the glove box....
I have a 1998 Ford Contour. Believe it or not the ABS and the Blower Motor share the same fuse. It's a yellow 60 amp and you have to take off the battery to get at it. Of course this happened twice in the 6 years I had the car, both times in the dead of winter. Tires Plus in Pennsauken, NJ replaced it. Other than that, no complaints with my Contour.
It's the blower resistor. It was the first thing I fixed on mine when I bought it several months ago. It was a $20 part from the dealer (you can order it from most auto parts stores too). It's EASY to replace, but you have to contort yourself a little. It's right under the passenger side of the dashboard, under the glove compartment. You remove a couple of screws, take out the old one, put in a new one and BAM!! You're all fixed!
Mine also had two settings before I fixed it. It was on or off, no in-between.
Your local auto parts store should have or be able to get the HAYNES Manual for the Expedition. I just bought one at Advanced Auto Parts to deal with a different A/C problem with my 2000 Expedition and it has great wiring diagrams & troubleshooting for the A/C among other problems.
The 2000 Expedition actually has "3" blowers. One front, one in the middle under the center console and one aft on the drivers side of the far rear panel. Sounds like it could be the center blower that's causing your problem. I think that blower is on Fuse 7. (Sorry - My Hayes manual is outside in the truck!)