Dead Battery on a 2001 Bonneville SSE

the higher the compression ratio the higher the octane rating required
normal compression ratio 10 or 11:1 will run on 91 or 95 octane rating
higher will require 100-110 octane rating or aircraft engine gas
superchargers only increase the amount of air available for combustion
it is the compression ratio that determines the octane rating required

you will have to insert the code for the radio because when the battery is dead the anti theft code is activated .

have you tried grease on the batteries nipples sometimes the cold can discharge the battery if you dont have any grease try petrolium jelly or vaseline etc

Powertrain control module is inside air cleaner housing in left side of engine compartment, )

HEATER CORE REMOVAL AND INSTALLATION 1997–01 Models BONNEVILLE AND LESABRE

1. Disconnect the negative battery cable.
2. Drain the cooling system into a clean container for reuse.
3. Remove or disconnect the following:
   • Heater hoses from the heater core
   • Right sound insulator
   • All necessary electrical connectors and remove the instrument panel compartment
   • Temperature valve actuator
   • Electrical connector and remove the HVAC programmer
   • Heater core cover-to-heater assembly screws and the cover
   • Heater core-to-heater assembly screws and the heater core Fig. 1: View of the heater hoses and clamp positions — 1997–01 Bonneville and LeSabre
     Fig. 2: View of the heater core cover — 1997–01 Bonneville and LeSabre
     
   To install:
   
4. Install or connect the following:
   • Heater core and the heater core-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm)
   • Heater core cover and the cover-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm)
   • HVAC programmer and connect the electrical connector
   • Temperature valve actuator
   • Instrument panel compartment and connect any necessary electrical connectors
   • Right sound insulator
   • Heater hoses to the heater core
5. Refill the cooling system.
6. Connect the negative battery cable.
7. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

These are typically located behind the glove compartment, or under the hood on the driver side mounted to the rear fire wall (usually older models).

Please let me know if you need further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

have you tried turning the engine manually?? it may be locked

You replaced the blower control module or the blower control panel on the dash? This has automatic temp control right?

It sounds like you have a short somewhere that is draining the battery...this type of thing is usually caused by a faulty voltage regulator. I recommend taking the alternator to an autoparts store to have it tested...don't be surprised if the alternator tests good; a faulty voltage regulator can and will drain a battery in a matter of hours. I am including a link where you can order a voltage regulator for your Bonneville or, while you are at the autoparts store, you can buy one there. The link will help you to see what the voltage regulator looks like so you can identify it in your engine compartment. Hope this helps, good luck!

has the battery been tested? sounds like a dead cell to me.