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.
Preliminary Testing
Start the engine, place control head selector lever in AUTO position and set temperature dial at "75". Allow sufficient time for engine to warm up and for system to come on (if system does not come on, install tester and proceed with tester procedure). If system does come on, rotate temperature dial slowly back and forth and check for malfunctions in operation; then move selector lever to each position and check for malfunction in operation. Noting the malfunctions and when they occur will assist in isolating the problem to a particular part of the system.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.