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2008 Grand Prix - No blower motor

A

Airman89

New member
Ok, I have been diagnosing this all day for 3 days now. I have no blower motor on any setting.

Here is what I have done;

Tested voltage at blower motor. I got .8v on full speed, and 2.4v on lowest setting(same when off).

Tested voltage going into resistor/blower motor control module. I got full 12.9 volts using the ground on the plug. So power and ground on the plug are good.

Replaced resistor. Still nothing. After I replaced resistor I checked voltage at the blower motor again to see if maybe blower motor was bad too and I got the exact same readings as before.... .8v on high and 2.4v on low.

Replaced motor for the hell of it with a known good one and got nothing.

Replaced switch controls for the hell of it and got nothing. No change.

Replaced connectors and wires for resistor and blower motor, I though maybe a wire fried in one of the connectors. No change.


WHAT AM I MISSING???!

Thanks in advance!
 


Any thoughts greatly appreciated at this point. The only possible thing left that I can think of is mentioned in the last post. Maybe the ground at the switch control itself has a bad ground?
 
You replaced the dash HVAC and the resistor and connector, did you replace the entire wire run?

Its sounding like a short somewhere in the harness to the blower.

Does the car have the dualzone climate controls or the normal dash controls?

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I just basically replaced the connectors but I did check continuity and everything checks out.

I have the normal controls not dual climate.

I did notice something later on tonight. I do actually get a full 12v at the blower connector, with the car off, until the second that I actually connect the blower. When I connect it, it spins a very very small amount just giving it a nudge, then stops and then the voltage reads around .5v until I unplug everything and try again.
 


You get 12 at the blower plug with the car off? Or the blower off?

If you are getting full 12 at a plug that usually requires the switch to be on/car to be on you have a short or wrong connection. Further, if I remember correctly, you should see full power at the plug only when the fan controller is turned all the way up, as it uses reduced power to spin at a lower RPM.

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