20 Most Recent 2003 Chevrolet Avalanche - Page 9 Questions & Answers

Faulty seat heater pad or seat heater switch.I would first check the switch connections and fuse.

Shift sensor in transmission. Costs me less than $200 at transmission shop.

On top upper side of bell housing on the engine. This page has a diagram and info.Look for the red arrow

http://www.2carpros.com/questions/chevrolet-avalanche-2003-chevy-avalanche-oil-pressure-sending-unit

it could be the blower motor. not a very expensive repair.

the evaporator its what the air comes through before going to the vents and if that leaks it will leak refrigerant/oil through the vents

Here is a video I made http://www.youtube.com/watch?v=ChC2J5MFfKI BASED OFF INSTRUCTIONS FROM www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&ved=0CIEBEBYwBA&url=http://www.chevyavalancheclub.com/index.php?action=articles;sa=view;article=96&ei=mAwJUL7BBqnq2EASY FIX, $100 out the door buying all parts, tools, and locktite

start your truck try putting in neutral and then try your buttons.

look under the seat there is a large plug that feeds power to the seat

Yes, it sounds like the regulator is at fault. The grinding noise sounds like a stripped gear. You will have to pull the inner door panel off to investigate.