Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Program Number
The program number is calculated by the ACP to determine the amount of heating or cooling required to meet the desired in-car temperature. This number is based on set temperature, outside temperature, in-car temperature, and sunload sensor.
The program number determines the proper air delivery mode and blower speed, and is also a factor in determining air-mix valve position. A program number of zero indicates maximum system cooling, and a program number of 99 represents maximum heating.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.