2005 chevy aveo hot key problem and air conditioner

Question edited for clarity.
Question moved from AC Cars, makers of the AC Cobra.

It could be many things.
AC / Heater Switch
AC Clutch
Fuses and Relays.
Body Control Module communication issue.

You need an AC specialist or an auto electrician with a pro grade scan tool computer. some ideas in the link

https://www.google.com/search?q=2005+chevy+aveo+ac+blowing+hot+air

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Question edited for clarity.

Wiring diagrams for free are only given in small blocks for parts like radio, or ignition. A service manual will give you the full wiring diagram, or you can use Google to specify an area.

year make model (specific area) wiring diagram

https://www.google.com/search?q=2005+chevy+aveo+wiring+diagram

Service Manual

https://www.google.com/search?q=2005+chevy+aveo+service+manual

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It should be on the air tube just after the air filter box.

Not likely. 20W-50 is usually used in high rpm engines in warm to hot climate. By any chance is your windshield defroster on? When the defroster is blowing your air conditioner compressor is engaged which pulls the moisture out of the air so you get HOT DRY air blowing on the interior of your windshield

The AC puts allot of heat load on the engine so of course it will run hotter but not overheat the engine, if that happens you may have a clogged radiator.

try to clean with brake cleaner first. is in air duct work two screws hold in place.

I would have gotten a locksmith to remove the old key, its cheaper than a new cylinder, plus you need to install it.

if the ' battery is good ' then it sounds like a bad starter solenoid. you can use a volt meter and see if voltage is going thru the solenoid to the starter. ( also while using the meter at the solenoid,, make sure it is infact showing a solid 12+ volts ), something could be draining the power down in that circuit.

c...

sometimes you can change your vaccum hoses

For all those out there that have had problems with your Chevy Aveo Stalling, inconsistent idling, hard to start, or throttle problems, Hollywood Harv has the answer for you. Try a new Valve Idling Air Cont GM part number 93744675. You only need one and it has to be install by Chevrolet so they can place in the codes to make it work properly. Toss the old one away as most likely has so much carbon build up on the part that it stuck or struggling to function properly. It worked on mine after many different attempts at other stuff! This is a sure winner! Good luck and drive safe! Hollywood Harv