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.
Symptom Tests: Notes
Review system description and operation to help determine the correct symptom diagnostic procedure when a malfunction occurs. See DESCRIPTION and OPERATION . Inspect easily accessible or visible system components for damage or defects which could cause symptom. Inspect wire harness and connectors for damage or defects and poor connections which could cause symptom or intermittent symptom condition. Inspect vacuum hose harness and connectors for damage or defects and poor connections which could cause symptom. Check any aftermarket devices on vehicle which could affect system or cause symptom. Refer to symptom and perform corresponding test to diagnose problem. See SYMPTOM TEST INDEX table.
| Symptom | Test |
|---|---|
| Air Delivery Improper | A |
| Blower Motor Always On | B |
| Blower Motor Inoperative | C |
| Blower Motor Malfunction | D |
| Compressor Clutch Does Not Disengage | E |
| Compressor Clutch Does Not Engage | F |
| Defrosting Insufficient | G |
| Temperature Control Binding | H |
| Too Cold In Vehicle | I |
| Too Hot In Vehicle | J |
NO RELATED
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.