[jeepsleep]

What should this be?
And how do I test it when it is OUT of the vehicle?

[KoreaZJ]

Welcome to JF!

Jeep year? (help others help you... fill in your Jeep profile info)

ATC blower motor power module?
Or manual controls blower motor resistor?

[jeepsleep]

Sorry, It's manual controls on a 1998 Jeep Grand Cherokee 6 cyl.

[KoreaZJ]

Are you missing fan speeds?

Use resistor Pin #3 as your reference, then measure resistance (in order) at Pin #2, Pin #4, Pin #1. Resistance values should increase each time. If there's an open, then the resistor is bad.

[jeepsleep]

Yes, I am missing fan speeds.
When it works it is only very low air barely coming thru the vents. And on all of the settings even the hi setting.
My resistor is the smaller one with the triangle shape on one end with the big block resistor attached to the bottom. Kind of looks like a big white eraser. KoreaZJ. How do I figure out which pins are which to test it?

[jeepsleep]

Originally Posted by jeepsleep

Yes, I am missing fan speeds.
When it works it is only very low air barely coming thru the vents. And on all of the settings even the hi setting.
My resistor is the smaller one with the triangle shape on one end with the big block resistor attached to the bottom. Kind of looks like a big white eraser. KoreaZJ. How do I figure out which pins are which to test it?

Bumping this because I only have one more day off to work on this.

Also how do I check the connectors under the dash for BOTH the blower motor and the resistor to make sure power is getting to them?

[KoreaZJ]

Red wire on blower motor should have +12v

[jeepsleep]

Originally Posted by KoreaZJ

Red wire on blower motor should have +12v

Perfect, I will check it and let you know what I measure.