Air condition and heat know not working

check battery connectors if they are loose or any loose wire on the starter. Could be something drains the battery like the dome light or car alarm wire or perhaps the battery is dead. Check before hand if all your doors close properly cause maybe your dome light is burned and still sucks out electricity... But finally when you put the key in the ignition is there lights on the dashboard^

check the condition of the battery with a load test. batteries are prone to failure in cold weather

I know this is no help really, but I have the part numbers for the belts but no diagram. I only have diagrams for serpentine belts.
Generally, the ac belt is the last one on the crank pulley. You should be able to tell if it goes around a pulley if you have empty pulley grooves.
Most V8 GM engines ran the AC belt around the crank and the water pump, but it depends on where they mounted the ac compressor.
And usually the compressor pivoted to adjust the tension.
If you can look down the groove of the ac clutch pulley and see any empty pulley grooves I would try running the belt in those grooves.
According to my Gates book, the alt belt goes around the crank and fan pulley, and the ac belt does too.

charge your battery.make sure car is turned off.put your battery in and connect the ground and then put your postive cable to the postive terminal and see sparks if so you have a short some where/hope this helps

I know this might sound stupid but make sure that you are putting the positive cable on the positive side of the battery and same on the negative side. I had one of my customers install a battery on his car and the alarm kept going of non stop because he crossed the wires. And he also blew his Ignition/engine fuse. Also check your main fuse.

sounds like you have a door ajar swisch out of adjusment,do the dome lights stay on or go on and off.do you have a scanner to look at body control module?

Put a 12v test light between the positive terminal and the battery cable.If the light is bright the draw is to much.A dim light is fine.if the light is bright,plug one fuse at a time until light dims.DO NOT cause a draw by leaving a door open etc while testing.DO NOT try and start the car or turn the key on during this test.Once you have found the fuse that causes the most draw,if you want to save $ you can just pull this fuse overnight or wire that circuit with a relay to unpower it when the vehicle is switched off.

You probably need a new battery. Starting takes a LOT more current out of the battery than the dome lights, etc.

The last couple of batteries that failed on me gave me no warning.

have you not left any load on overnight?..like park light or left the door partially open and the dome light would be left on?

have the battery recharge and the next night, make sure that no light would be left on the car.

if it would drain out again, have it recharged again, use it and on the night, make sure no light is left on the car, then remove the positive pole on the battery overnight.

the next morning, put the positive cable back and start the car.

if the car would start, then no problem with the battery, if the car would not start, then return the battery because it is defective.

tnx 4 using fixya,

drcool

First check the battery voltage if its less than recommend voltage then its the battery ,try jump starting the car if its works then you need replace its battery ....


Good luck...