Where is the blower resistor located on a 2008

It is #3 in the picture. You should be able to get at it in the engine compartment.

Why ? Does the blower work on high ? but no other speeds ! If it doesn't come on at any speed it's not the resistor . Does the vehicle have automatic climate control or manual ? Automatic doesn't have resistor , has a blower motor control processor . HVAC Blower Motor Circuit You need to test , not guess !

Follow the steps in the given process:
http://www.ehow.com/how_5554649_troubleshoot-blower-motor-resistor.html

You will find out the problem.

Performance Parts For Pontiac

You will need to remove the engine's valve cover at the rear of engine to remove the blower motor, also replace the blower motor resistor while you are in there.

Here's a guide to remove your blower,check your blower motor resister too,it's next to the blower,2 screws hold it on.http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?fromSearchPage=true&pageId=0996b43f8038fb36&partName=Blower+Motor&partId=0996b43f8038fb36 Here's another link to relay.http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?fromSearchPage=true&pageId=0996b43f8038fb36&partName=Blower+Motor&partId=0996b43f8038fb36 hERE'S THE RESISTOR.http://www.autozone.com/autozone/parts/1996-Pontiac-Bonneville/A-C-Heater-Blower-Motor-Resistor/_/N-j4ys1Z91tag?filterByKeyWord=blower+motor&fromString=search

Go to any autoparts online store such as autozone and you can look up any part replacement step by step. May have to register.

You replaced the blower control module or the blower control panel on the dash? This has automatic temp control right?

The blower resistor is under the hood on the passenger side right on top the a/c box that is bolted
to the firewall.

Center Rear Of Engine Compartment, At Cowl