| Component Location |

| 1. Condenser 2. Discharge hose 3. Suction & Liquid tube assembly 4. Compressor |
5. Service port (High pressure) 6. A/C Pressure transducer (APT) 7. Service port (Low pressure) 8. Expansion valve |

| 1. Heater & A/C Control Unit 2. Photo sensor |
3. Heater & Blower Unit |
Refrigerant System Service Basics (R-134a) Refrigerant Recovery Use only service equipment that is U.L-listed and is certified to meet the requirements of SAE J2210 to remove HFC-134a(R-134a) from the air conditioning system.
Oil Specification 1. The HFC-134a system requires synthetic (PAG) compressor oil whereas the R-12 system requires mineral compressor oil.
Description The PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of heater core. The PTC heater is an electric heater using a PTC element as an auxiliary heating device that supplements deficiency of interior heat source in highly effective diesel engine.
Trouble Symptom Charts Trouble Symptom 1 Trouble Symptom 2 Trouble symptom Probable cause Remedy The set vehicle speed varies greatly upward or downward "Surging" (repeated alternating acceleration and deceleration) occurs after setti