Refrigerant changes from hot vapor to warm liquid. Latent heat is released as refrigerant condenses. Airflow carries this heat away from machine.
Requires unrestricted airflow across fins. Location varies by model series - tailgate mounting on R-Series is easy to forget about, while M-Series mounting with coolers tends to trap debris.
Bobcat condensers are aluminum parallel-flow design with protective screens. Not pratical to flush. Critical to check for debris damage and airflow restriction during diagnosis.
M-Series: Mounted with machine coolers in engine compartment
R-Series: Located on machine tailgate
Look for aluminum fins and refrigerant lines. Often has protective screen or grille.
Parallel-flow: Multiple tubes with refrigerant flowing in parallel for maximum heat transfer efficiency.
Series-flow: Single serpentine tube path for simpler construction and easier cleaning.
Fins are closely spaced and easily damaged. Careful with pressure washing.
Hot vapor enters at top, liquid exits at bottom.
Fan must be working correctly. Machine should increase fan speed if AC is on. Protective screen prevents debris damage but can restrict airflow if clogged.
Bobcat Specification: 20°F temperature drop across condenser is considered normal operating condition. Use this as baseline when testing condenser performance.
Measure surface temperature entering and leaving condenser. 15-20°F difference indicates proper heat rejection. Use infrared thermometer for accurate readings.
High-side pressure should be 175-200 psi at 70-80°F ambient (rule of thumb: 2.5 × ambient °F). Elevated pressure indicates airflow restriction or overcharge.
Check for bent fins, debris buildup, oil leaks, corrosion. Use fin comb to straighten damaged fins. Look for impact damage.
Feel airflow across condenser surface with machine running. Reduced airflow indicates fan problems or blockage.
| Symptom | Cause | Diagnosis |
|---|---|---|
| High high-side pressure | Debris blockage, fin damage, fan failure | Visual inspection, airflow test, pressure readings |
| Poor cooling performance | Restricted airflow, internal contamination | Temperature differential, pressure analysis |
| Refrigerant leak | Impact damage, corrosion, vibration fatigue | Visual inspection, UV dye test, electronic leak detector |
| Fins bent or damaged | Debris impact, improper cleaning | Visual inspection, reduced airflow |
Regular condenser cleaning prevents most failures. DO NOT REPAIR A CONDENSER OR EVAPORATOR. Replace only.
Condenser replacement requires complete refrigerant recovery. New condenser shoudl arrive capped or must be flushed before installation.
Condenser mounted on machine tailgate. Critical Note: Opening the tailgate removes the condenser from airflow. Pressure will increase until pressure switch cuts off compressor clutch and sets an open circuit fault code. Always keep tailgate closed during AC operation.
Condenser mounted with machine coolers in engine compartment. Shared cooling area affects airflow patterns and maintenance access.