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· Banned
2004 gmc
26,436 Posts
All separate issues. Sorry.

Batteries can spontaneously go dead from a broken internal connection to the post. Usually from a bump. Rare, but it happens.

The fan speed control issue is without a doubt your blower resistor pack. Run a search and you'll find a thread with pics of how to change it. Under $50 from the aftermarket parts stores - it's up under the dash behind your glove box.

The gas gauge level is an unreliable design of the sending unit, inside the tank. Lots of labor to drop the tank and replace it, but again, there are members here who have done it, with pictures. Search.

Are you a DIY kind of person? You'll save a lot of $$ if you are. Or if you have a trusted non-dealer mechanic.

Thanks for checking here, though. We owners know the platform a lot better than most mechanics who don't work on them as much.
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