My 2004 heater fan stopped working on any speed except high. The AC will not come on unless the fan is in the high position. I ordered a replacement climate control panel and replaced it. Same problem. Is there a fuse that controls the fan but not the high speed on the fan??? Help please!
Heater Fan only works on high speed
- Thread starter JSM
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fastandloud
Enthusiast
Its the resistor...located in passenger footwell by the blower motor. Try soldering the strap back together before replacing. Worth a shot since new ones are around $125!!
TowDawg
Enthusiast
Definitely the resistor.
One thing to think about, it *****, but it's what I was told, is to replace the resistor and the blower motor at the same time. I did this because I was told that there is usually something that causes the resistor to go, and if you put a new one in there, it might just get blown again. I'm not sure if it's 100% accurate, but since I was already in there changing the resistor, I went ahead and changed the blower motor as well. It's a little more money, but I'd be pissed if I changed the resistor and then had to buy another, plus the motor, plus change it out again. Just FYI of what I was told/did.
One thing to think about, it *****, but it's what I was told, is to replace the resistor and the blower motor at the same time. I did this because I was told that there is usually something that causes the resistor to go, and if you put a new one in there, it might just get blown again. I'm not sure if it's 100% accurate, but since I was already in there changing the resistor, I went ahead and changed the blower motor as well. It's a little more money, but I'd be pissed if I changed the resistor and then had to buy another, plus the motor, plus change it out again. Just FYI of what I was told/did.
Hopefully now, it blows, not *****...
Thank you guys! I will let you know what I find out. I will think hard about the blower motor replacement. But if I can solder the strap back together, that I would do, without replacing the motor and see what happens.
Thanks again!
Thanks again!
ninjakris
Enthusiast
Try to solder it first. I had the same issue, and after a little solder, I was good to go. I think there is some old threads with pictures floating around here somewhere. Good luck
ninjakris
Enthusiast
http://forums.viperclub.org/threads/626544-Blower-motor-resistor?highlight=resistor
Check out the pictures on this thread. The very first picture shows how the bar/strap is supposed to be connected, but is not. I'm no electronic ****, but it apears that the four fan settings coorispond to the four tabs and 1-3 go through 4. Once there is a voltage spike or something, it breaks the path to 1-3, only leaving 4 usable. My last viper (03) looked exactly like the pictures. I soldered the bar back to position 4 exactly where there was already some solder and my system worked fine. Its kinda a pain in the ass to get under the dash but use a headlight/flashlight oand it will be easy to find. I think its held by two phillip screws.
Check out the pictures on this thread. The very first picture shows how the bar/strap is supposed to be connected, but is not. I'm no electronic ****, but it apears that the four fan settings coorispond to the four tabs and 1-3 go through 4. Once there is a voltage spike or something, it breaks the path to 1-3, only leaving 4 usable. My last viper (03) looked exactly like the pictures. I soldered the bar back to position 4 exactly where there was already some solder and my system worked fine. Its kinda a pain in the ass to get under the dash but use a headlight/flashlight oand it will be easy to find. I think its held by two phillip screws.
Green viper 1
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Mine is do the same thing thanks for info
fastandloud
Enthusiast
Mine as well...again. Just did all this 2 years ago (blower and resistor) and now the resistor is gone...I have High at least. ERRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
It took longer to get the tools out, Phillips screw driver, solder gun, solder, electrical contact cleaner and to put them away, than it took to fix! Thanks so much for the help!!!
The contacts were corroded and the white ceramic block does have a crack in it, but seems to be solid.
Thanks again.
The contacts were corroded and the white ceramic block does have a crack in it, but seems to be solid.
Thanks again.
ninjakris
Enthusiast
So I'm guessing it is working now??? Glad to see you tackled it yourself and saved some $$$
Blower Motor Resistor.
It changes the voltage to the blower motor based on the resistance. When you change the fan speed, there is a higher resistance on the power wire for the blower motor. This results in less voltage which in turn slows the blower motor down.
Low = Highest resistance
Hi = No resistance, 14.4 volts
The motor nearly always is the cause of the resistor failure. They get water in them, rust inside, and then stick. When they stick, the resistor bar pops.
Two points:
-Generally, replace them together.
-Spray the inside of the motor with a light oil.
-After car has been stored for a while, ALWAYS crank to "MAX" before using the lower settings. This will break the motor free IF it is sticky, and save the resistor.
-If possible, try to run the Fan without the A/C on for a while after you have been using it, before storing the car especially. This is primarily where the condensation comes from.
Two points:
-Generally, replace them together.
-Spray the inside of the motor with a light oil.
-After car has been stored for a while, ALWAYS crank to "MAX" before using the lower settings. This will break the motor free IF it is sticky, and save the resistor.
-If possible, try to run the Fan without the A/C on for a while after you have been using it, before storing the car especially. This is primarily where the condensation comes from.
