HVAC And A/C
Repair Service

Compressor diagnosis covers clutch engagement voltage, clutch air gap, internal noise, and oil charge condition. A noisy compressor with normal pressures may have failed bearings — a condition that will contaminate the system with metallic debris if the compressor is not replaced before it seizes. We identify the failure mode before recommending replacement.

Compressor replacement requires complete system evacuation, debris inspection of the receiver-drier and expansion valve, and a system flush when the old compressor has failed internally. Installing a new compressor in a contaminated system causes premature failure of the replacement — system flushing is performed when any internal compressor failure is confirmed.

• Receiver-drier replaced with every compressor installation
• New refrigerant oil installed to specification with the replacement compressor
• System evacuated to correct vacuum level before recharging

Refrigerant recharge is performed only after the leak source is identified and repaired. Recharging a system with an active leak returns the truck to service temporarily while the underlying problem continues — causing refrigerant loss, potential compressor damage from low charge operation, and a repeat visit within weeks.

Leak detection uses electronic refrigerant sensors at all system connections — fittings, hose ends, condenser and evaporator connections, and the compressor shaft seal. Shaft seal leaks are a common A/C failure on trucks with infrequent A/C use, where the seal dries and shrinks from lack of lubrication during extended periods without compressor operation.

• UV dye injected and UV lamp used to confirm leak location
• All replaced hose ends fitted with new O-rings and correct fitting torque
• Charge weight verified with calibrated refrigerant scale after repair

Heater core diagnosis covers coolant flow through the core, blower airflow across it, and temperature output at the cab vents. A heater that blows warm but not hot typically has a partially restricted core or a blend door that is not opening fully — a heater that blows cold has either a coolant flow issue or a control valve failure that is preventing hot coolant from entering the core.

Heater core replacement on Class 8 trucks requires dash disassembly and is a labor-intensive repair. We confirm the heater core is the failure point — not a closed coolant valve, a low coolant level, or a failed blend door actuator — before beginning the disassembly to avoid unnecessary repair costs.

• Coolant control valve tested for full open and close operation
• Cooling system pressure tested after any heater core work
• Blend door actuator operation confirmed after reassembly

Blower motor diagnosis covers motor amperage draw, resistor pack condition, and control switch operation. A blower that only works on high speed has a failed resistor pack — a common and inexpensive repair that is sometimes misdiagnosed as a control switch failure. We test the resistor pack voltage output before replacing the switch or motor.

Blower motor replacement covers the motor, cage, and sealing foam around the housing. A blower motor housing that is not properly sealed allows unfiltered air to bypass the cabin air filter and enter the cab — causing debris accumulation on the evaporator core that restricts airflow and accelerates core corrosion over time.

• Cabin air filter condition inspected with every blower motor job
• Blower motor noise test performed under varying speed settings
• All control modes verified after blower and resistor repairs

Complete climate system inspection covers the full circuit from the condenser and compressor through the evaporator and heater core to the cab vent outlets. We test heating, cooling, defrost, and ventilation modes systematically — confirming the system performs correctly in all modes before the truck is returned to service.

Auxiliary cab A/C systems on sleeper trucks are diagnosed and serviced separately from the primary cab system. Auxiliary evaporator and condenser units, separate compressor circuits, and dedicated blower systems are tested and recharged to the correct specification for the aux system — which often differs from the primary cab system requirements.

• Defrost mode verified with thermometer at windshield vents
• All mode door positions confirmed through the full control sweep
• Cab temperature verified at ambient plus and minus extremes after service