2003 Chevy Express Hvac problem

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MSLI

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Should I attempt this ? Symptoms are every other day the controls stop working. YouTubed it and it looks like something I may actually be able to handle, especially since my mechanic is booked up. I was going to start with changing out the Resister but maybe should replace the blower motor also. Any advise from experience ? Thx !
 

Floorist

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I would test the blower motor first. If you can get to just run a hot and a ground to the two terminals. I don't where the motor is on that year.
 

highup

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Should I attempt this ? Symptoms are every other day the controls stop working. YouTubed it and it looks like something I may actually be able to handle, especially since my mechanic is booked up. I was going to start with changing out the Resister but maybe should replace the blower motor also. Any advise from experience ? Thx !
I have that issue where this switch wasn't working and I found that if I wiggled my ignition switch a tiny bit the blower would come on. It's just a contact in the ignition switch.
There may also be a relay switch that is defective.
What all is it doing and not doing.
Is it intermittent?
 

MSLI

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It has never kicked on while the engine was running. Just hit or miss. I wiggled and jiggled the ignition but nothing. Also, the first two fan speeds (low / Med. ) haven’t worked for years.
I would test the blower motor first. If you can get to just run a hot and a ground to the two terminals. I don't where the motor is on that year.
motor is accessible but my skills are limited 😞
 

Tile Tom

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I have a 2013 express 3/4 ton extended.
I feel like I remember replacing the fan speed knob a while back for similar issues.
There's a snap in trim piece on the dash that once you remove, there's just a bunch of screws holding your knobs on.
 

highup

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Not the same year and I haven't watched the video but what the hell it might give you some ideas.
 

Tile Tom

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16463102906558822816789195200544.jpg
This is the knob I replaced about 8 years ago. First I lost low fan speed, then the medium and finally the last two wouldn't do anything intermittently. Sometimes It would work sometimes not. Changed it out and bingo, back in biz.
 

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