Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: 2008 Mariner Premier Blower Fan
You're correct, the blower control module replaces the resistor module, but high is still a full 12V but grounded through the control module. You may have lost that ground. The connection to the motor should be yellow green and yellow blue (Y-G and Y-Bu), Y-G is hot and Y-Bu is ground. See if your getting 12V off of the Y-G when it's supposed to be running and verify you're getting a ground on Y-Bu when in manual high.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?