I replaced my heater blower in my 2002 bonaville and it either wont work at all or it runs all the time and woont shut off

Check your blower motor resister,it's next to the blower.

Some times the new part is bad. If you put the old one in do all the new symptoms go away if they do take the part back.

will try to help but i think you'll need to have that blower replaced. if it's coming on for a sort while and then shuts off after running a short while it sounds to me like the blower motors heating up inside and then shutting itself off due to a short in the blower motor itself. no really quick fix i know of other than replacement of it. hope this helps and thank you for choosing fixya.com

For the blinkers you need to replace the hazard switch.This will take care of your problem.For the blower,if this is what you mean by heater won`t shut off.You need to replace the blower motor resistor.This will fix your blower not shutting off.The light for the knob you will have to remove the control panel and replace the bulb if it is replacable.Some of these models you have to replace the control panel to get the lights to work.I hope this helps Heidi and let me know if you need anymore help.Good luck.

Hi Adam,sounds like your blower motor resistor is bad,it controls your blower motor speed.Here's a link on how to replace,read the beginning and it will explain how the system works,as it says,their a different types for your vehicle so remove and take to Autozone and match it up with a new one. Repair Guides Heating And Air Conditioning Blower Motor AutoZone com Here's a link to some new one's. Blower Motor Resistor

put a clamp on one of the feed pipes

sounds like the blower motor is heating up and quits working. after it cools down over night it starts working again.

IF THE BLOWER MOTOR ONLY WORKS PN HIGH THEN YOU NEED TO REPLACE THE BLOWER MOTOR RESISTOR LOCATED ON THE SAME HEATER BOX AS THE BLOWER MOTOR

replace the blower motor speed control resistor

My 2003 Sierra's blower came on by itself in the garage while I was sleeping and ran the battery completely down. I had to replace the blower switch located under the glove box next to the blower at the bottom of the right corner of the dash. The switch is in front of the blower and held in by two screws. Disconnect the two wire connections. This is a "dealer only" part and cost me 65.00. Also check the wire harness with seven wires connected to it for melted plastic. It will be marked "ABCDEFG". If it has melted, you'll need to replace it. Pay attention when reinstalling either part, that the wires "ABCDEFG" match the switch in that order.