Fuel and Service Trucks Air Conditioning and HVAC Repairs

HVAC systems on fuel and service trucks

Standard heavy-vehicle cab system with engine-driven compressor, front condenser and cab evaporator. Long periods of idling during refuelling and servicing reduce condenser airflow and compressor speed just when cooling is needed.

Common faults we find on fuel and service trucks

• Poor cooling at idle
• Condenser fouling
• Clutch cycling
• Charge loss

Diagnostic process

• Operator interview and fault confirmation with the machine running under load
• Visual inspection of condenser, belts, hoses, wiring and cabin filters
• High and low side pressure testing against the manufacturer's specification
• Electronic leak detection, dye tracing or nitrogen pressure testing where required
• Electrical fault finding on clutches, relays, pressure switches and control modules
• Written findings, parts list and repair recommendation before work proceeds

Repair approach

• Correct recovery of refrigerant before any component is opened
• Compressor, condenser, evaporator, drier, valve, blower and harness repairs or replacement
• System flushing and drier replacement after contamination or compressor failure
• Vacuum, leak hold test, charge by weight and oil balance to specification
• Function test across the full temperature range with cabin outlet readings recorded

Preventative maintenance recommendations

Verify cooling performance at idle, clean condensers and inspect fan and shroud condition.