Blower motor

BEAR3NO1

MEMBER
1999 PONTIAC GRAND PRIX
6 CYL
FWD
AUTOMATIC
116,000 MILES

When replacing the blower motor on my 99 Pontiac Grand Prix, the replacement part didn't come with a wiring harness to plug back in. The wires that are on the replacement are black (neg) and red (positive). The two wires that are under the dash of the car are not red and black. Which one is the positive and which one is the negative?

7 Replies

HMAC300

MECHANIC
48,601 POSTS

The plug in should only go one way the harness plugs into the blower motor. The wiriing runs from the blower resistor and if that is missing you need a new resistor. There should be a lock on the plug unless it's broken off to plug into the blower.

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Friday, November 19th, 2010 AT 5:21 PM

WRENCHTECH

MECHANIC
20,761 POSTS

The schematic doesn't supply color codes. All you have to do is just use a test light with the key on and see which one has power. It sounds like your using a cheap Chinese replacement motor instead of a quality Delco unit. You get what you pay for remember.

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Friday, November 19th, 2010 AT 5:22 PM

JDL

MECHANIC
16,098 POSTS

Terminal A is voltage. Terminal B is ground. MOD didn't give a wiring color.

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Friday, November 19th, 2010 AT 5:23 PM

BEAR3NO1

MEMBER
3 POSTS

Yes wrenchtech it is a cheap chinese replacement. When you have two kids in school and trying to live on a single income, you save money wherever you can.

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Saturday, November 20th, 2010 AT 6:11 PM

BEAR3NO1

MEMBER
3 POSTS

What is the return air flow used for? Why is the rubber tube there? My "cheap chinese replacement" has the return air flow hose on the front of the motor instead of the rear. I have twisted and turned, but there is only one way to mount the blower motor (screw holes lining up properly) I am as green to car repair as possible, but I have to save money where I can