Ac/heater blower relay

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

Box under hood or back at gas tank with fuel pump

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

Are you sure it is the heater that is draining the battery? If you are sure it is the heater blower that is causing the problem try pulling the heater relay, let it sit over night and check the battery. If it starts then either troubleshoot the heater problem further or leave the relay out...good luck!

ther is a blower moter resisterthat controls speeds;that burns out that is comon

you need new blower module located at blower under hood, against the firewall under the relays it has four or five wires in it, and two bolts holding it in.

You seem to have a bad cooling fan switch...it's connected to the side if the engine and when it gets too hot it turns on your cooling fans. The switch doesn't cost that much, $10 to $15 and takes all of about 15 minutes to replace.

yes there are fuses but there will be other instruments running off the same fuse! If everthing else seems to be fine than i would go directly to the blower located on the fire wall and change it!