Heater blower motor only works on high on 2002 pontiac gran prix se-instructions on diy replacement i have the part. Heater Fan works occasionally on speed 5 only. When it doesn't work at all the lights do not come on automatically and the heated seat does not work.

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short in the wire harness follow wires from blower to harness

There are fuses for hi and low blower fan inside the interior fuse panels I know the high one is on the passenger side and believe the low is on the drivers side tho they may both be on the passenger side read the cover after you pull them off easy to find once you read the label if those are both good then its probably the blower resistor, fuse check first.

Sounds like a bad ground connection to the blower housing. Try to eliminate this by connecting one 'battery jumper cable' from the ENGINE or battery (neg) to the blower motor housing. You may have to get clear of some plastic to reach it. Does this change how things work?

THE BLOWER MOTOR RESITOR IS BAD.IF U HAVE RESITOR IT IS UNDER THE DASH ON THE PASSENGER SIDE AND HELD IN W/TWO SCREWS

try the fan relay should be located on the heater box

When the blower motor resistor goes it will still usually work on the high setting because that bypasses the resistor.
First look on the passenger side below the glove box you will see 3 press-pins. You need to remove the 3 press-pins and the panel they are holding up.

Now you will se a bracket holding a bundle of wires and 2 vaccum hoses on the left side of the blower motor see pic. This is held on with 2 screws. Remove the screws and let the bracket hang off to the side.

Now remove the blower motor there are 3 screws to remove the blower motor a plug-in and a black hose. The black hose and plug-in you can not see from this side. You will kinda have to angle the blower motor and push the wire bundle out of the way to remove the blower motor.

Now with the blower out of the way remove the closest screw from the blower motor resistor. Disconnect the plug in from the resistor and carefully slide the assembly to wads you and it should pop down. There are a total of three screws that hold the resistor in but you only have to remove the one.

Now just reassemble the way you took everything apart. Hope this helps. I think the resistor is only like $20.00 at Auto Zone or Parts Source, they also have step by step instruction to.

Good luck

i do believe you have to take the passengers side dash apart behind the glove compartment. go to autozone and get a manual or go to the library and check the chiltons manual. this is not an easy job. how bad is the leak? if its not bad these heater cores are made of all aluminum. i would buy a bottle of that radiator additive and see if that takes care of the problem first. it only cost about 5 bucks a bottle and it may permanantly fix your problem.

I have an '04 with approx. 79000 miles; the blower is going out on mine too. The motor is probably burned out and you will need to replace it. It's about $90 for the part. Kind of a pain to change; I changed the blower motor on my 97 'prix and I had to lay upside down on the passenger seat and work on it upside down. Other than a little physically uncomforable, not too hard to do.

I would suggest replacing the blower motor resistor. When this component fails the blower will only work on one spped or none. This is a very common issue with all automotive models