Rigid Dump Trucks Air Conditioning and HVAC Repairs

HVAC systems on rigid dump trucks

Heavy-duty engine-driven compressor with long refrigerant lines to a cab-mounted evaporator and a separately filtered pressurisation supply. Long hose runs exposed to vibration and heat, high cab heat load and frequent condenser fouling.

Common faults we find on rigid dump trucks

• Hose crimp leaks
• High head pressure
• Frozen evaporator
• Electrical harness chafing

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

Inspect hose routing, clamps and bulkhead fittings at every service and record outlet temperature trends per unit.