Modern HVAC systems combine mechanical components with complex electrical and electronic controls. A failure in any one area can cause symptoms that seem unrelated — like warm air when cooling is on or air only blowing from one side of the cabin.

Our diagnostic process checks the entire system, including:

• Compressor and clutch operation
• Airflow direction and blend door actuators
• Cabin temperature sensors and control modules
• Blower motor speed controls and resistors
• Refrigerant pressure, temperature, and vent performance
• Communication faults between HVAC and body control systems

By evaluating data from multiple systems, we identify the root cause — not just the visible symptom.

At The Garage MKG, we use professional-grade diagnostic equipment and manufacturer-level software to test every part of the HVAC network. This allows us to analyze live data, actuator position feedback, and temperature differentials throughout the system.

Our HVAC diagnostics process includes:

• Full system scan for fault codes
• Electrical circuit testing with multimeter or scope
• Actuator command tests for blend and mode doors
• Temperature drop and pressure correlation testing
• Visual inspection of wiring, sensors, and connections

Once testing is complete, we review results with you in plain language — so you understand exactly what needs repair and why.

HVAC problems are often caused by small, hidden issues — a broken blend door, failed resistor, or voltage drop in a circuit. That’s why we document everything through your Complete Vehicle Health Report, including fault codes, photos, and temperature readings.

After diagnosing the issue, we’ll provide accurate estimates for repair, replacement, or recalibration, ensuring your heating and cooling systems perform like new. Every step of the process is transparent — no surprises, no unnecessary upsells.

If your vehicle isn’t heating, cooling, or defrosting properly, schedule HVAC diagnostics with The Garage MKG today. Call (231) 246-7735, visit 1860 Henry St, Muskegon, MI, or book online anytime.

We’ll test, verify, and document your system’s performance — restoring reliable climate control and your confidence behind the wheel.