SOURCE: How do I replace a Heater Blower motor in a 2003 Pontiac Vibe?
Remove the Glove box. You will then have access to the Blower unit. There are 3 screws that are holding the blow unit in place. You will need a Phillips screw driver and a 1/4 socket. Once you have located the unit remove the 3 screws and the unit will fall straight down. Unplug the wire harness and then reinsert the new Blower Motor. If you purchase an original GM part this makes life much easier, you just screw the 3 screws back into the holes and then plug the wire harness back in and reinstall the glove box. If you use an aftermaket part you will need to do some wire splicing to make it work but it is a 10 to 20 minute job depending on which part you decide to replace the Blower with.
SOURCE: ac relay location 2004 pontiac vibe
look in the fuse panel located in the engine compartment near the battery
Robert
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SOURCE: 2005 Pontiac Vibe heater fan working on high only
My 2005 Vibe did the same thing it was the heater resistor. It is located to on the firewall behind the glove box on the lower left side of the blower assembly. Two 5.5mm screws hold it in place (1/4 inch socket works too). I used a socket attached to a socket swivel to replace mine in under 10 minutes. Heater now works as good as new. I purchase mine online for $30 from rockauto.
SOURCE: Heater fan
not necessarily could be something else try jumping the fan with direct current from battery and see if it runs could be in fan switch or could be a fuse causing the problem if it does not run with direct current from battery then it is the motor.
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SOURCE: On my 2005 Pontiac Vibe the heater fan does not work all the time
If it works some times then it is probably the switch.
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