It works fine in 1,2 and 4th speeds. Would that be a resistor problem if it has one? There are no codes stored.
17 Chevy Spark blower motor not working in speed 3.
- Thread starter atikovi
- Start date
- Status
Resister or switch. Resister is more common.
The lower speed resistors are run in series, So if speed #3 resistor was burnt out/Open....You would only have High Speed/4 which bypasses the resistors all together.
*I would first suspect a bad connection at the resistor pack (Melted terminal cavity/Overheated terminal).
*If everything looks good there....Backprobe the Blue/Yellow wire at the resistor pack with a test light hooked to Battery Positive, The test light should light-up if the Switch & #3 speed control circuit is sound.
If you have a Power Probe....Even better, You can see the circuit go from High with the blower switch Off....To Low with the blower switch is in #3 position.
![[Linked Image]](https://i.imgur.com/jbJTM92.png "[Linked Image]")
*I would first suspect a bad connection at the resistor pack (Melted terminal cavity/Overheated terminal).
*If everything looks good there....Backprobe the Blue/Yellow wire at the resistor pack with a test light hooked to Battery Positive, The test light should light-up if the Switch & #3 speed control circuit is sound.
If you have a Power Probe....Even better, You can see the circuit go from High with the blower switch Off....To Low with the blower switch is in #3 position.
![[Linked Image]](http://www.fototime.com/FF2734E6751D744/large.jpg "[Linked Image]")
Will see if a pigtail or connector is available.
Originally Posted by clinebarger
The lower speed resistors are run in series, So if speed #3 resistor was burnt out/Open....You would only have High Speed/4 which bypasses the resistors all together.
*I would first suspect a bad connection at the resistor pack (Melted terminal cavity/Overheated terminal).
*If everything looks good there....Backprobe the Blue/Yellow wire at the resistor pack with a test light hooked to Battery Positive, The test light should light-up if the Switch & #3 speed control circuit is sound.
If you have a Power Probe....Even better, You can see the circuit go from High with the blower switch Off....To Low with the blower switch is in #3 position.
Great stuff
Originally Posted by atikovi
Will see if a pigtail or connector is available.
Yuck!
Glad you found the problem though
Is it still under warranty?
The lower speed resistors are run in series, So if speed #3 resistor was burnt out/Open....You would only have High Speed/4 which bypasses the resistors all together.
*I would first suspect a bad connection at the resistor pack (Melted terminal cavity/Overheated terminal).
*If everything looks good there....Backprobe the Blue/Yellow wire at the resistor pack with a test light hooked to Battery Positive, The test light should light-up if the Switch & #3 speed control circuit is sound.
If you have a Power Probe....Even better, You can see the circuit go from High with the blower switch Off....To Low with the blower switch is in #3 position.
Great stuff
Originally Posted by atikovi
Will see if a pigtail or connector is available.
Yuck!
Glad you found the problem though
Is it still under warranty?
No warranty over 100,000 miles.
That's really weird on such a new car! Good thing you found it, atikovi.
Good news. Resistor $15.
Bad news. Connector $70 list.
Bad news. Connector $70 list.
- Status
Similar threads
