I had something strange happen today when I went to leave for work. I used remote start as usual and when I got in the car and turned the key on.. I turned the blower fan up and began to hear a fast, loud thumping coming from under the dash. I immediately shut the car off and took another car to work. When I got home I did some more tests on it and it only does this when using the remote start. Is there some sort of relay causing this? Is there a TSB out for this? HELP!!
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SOURCE: 2004 Chevrolet Silverado Heater/AC Blower on without Ignition ON
there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate
SOURCE: CHECK ENGINE LIGHT
Any time the Service Engine light comes on the remote start is disabled for the engines safety. As far as the SES light, your dealer should be able to help you with the diag.
SOURCE: Blower motor or resistor?
Yes its the blower motor resistor.
More then likley theres some trash or something in it, or possibly the motor itself is on it's way out. There not that bad to pull out of that body car, just pull it out and see what you can see.
The blower motor is under the glove compartment
You can replace the resistor on your own. Please find a detailed diagram which would guide you to do it.
http://autorepair.about.com/library/images/bl629a-lib.htm
Thanks
SOURCE: Blower motor or resistor?
I had a truck about the same year with the same problem, it was the wiring harness, but id check the resistor and the fan first before replacing anythings,
SOURCE: 2003 silverado blower fan stays on..
under the passenger side dash, right above floor board there is a wire connector. That connector is for your blower resistor. If you unhook it, the blower will stop running, hook it back up and you will have a blower. You can also remove the fuse. Point being you can use your truck. Order the new part and replace it. I can't remember how many wires went to it off hand, its rectangular, mayber 6-7or 8ish.
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