Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2021TRANSIT-350 HD BASE, VAN CARGO EXTENDED, 3.5L ENG VIN 8, RWDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSCLIMATE CONTROL SYSTEM - GENERAL INFORMATION
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, RWD
Climate Control System - General Information
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, RWDSECTION Climate Control System - General Information
- Specifications
- Description And Operation
- Climate Control System - Component Location
- Climate Control System - Overview
- Climate Control System - System Operation and Component Description
- System Diagram
- Network Message Charts
- The Refrigerant Cycle
- Component Description
- Electric Booster Heater
- Fuel Fired Booster Heater
- Rear Climate Control
- HVAC Control Module
- Blower Motor Control Module
- Evaporator Core
- Heater Core
- Climate Control Housing
- Door Actuator - Air Distribution
- Door Actuator - Air Inlet
- Door Actuator - Temperature
- A/C Pressure Transducer
- Ambient Air Temperature (AAT) Sensor (if equipped)
- Evaporator Temperature Sensor
- A/C Compressor Clutch
- Externally Controlled Variable Displacement Compressor (EVDC) (if equipped)
- Thermostatic Expansion Valve (TXV)
- A/C Condenser
- Receiver Drier
- Service Gauge Port Valves
- Refrigerant System Dye
- Diagnosis And Testing
- Climate Control System
- Diagnostic Trouble Code (DTC) Chart
- Symptom Charts
- Pinpoint Tests
- Pinpoint Test A: The Electric Booster Heater Is Inoperative Or Does Not Operate Correctly
- Pinpoint Test B: P0532, P0533
- Pinpoint Test C: P0645
- Pinpoint Test D: B1B71:11, B1B71:15
- Pinpoint Test E: The Air Inlet Door Is Inoperative
- Pinpoint Test F: B1086:07, B1086:11, B1086:12, B1086:13, B11E7:11, B11E7:15
- Pinpoint Test G: Incorrect Or Erratic Direction Of Airflow From Outlets
- Pinpoint Test H: Insufficient, Erratic Or No Heat
- Pinpoint Test I: The A/C (Air Conditioning) Is Inoperative
- Pinpoint Test J: The A/C (Air Conditioning) Is Always On -- A/C (Air Conditioning) Mode Always Commanded On
- Pinpoint Test K: The Front Temperature Control Is Inoperative Or Does Not Operate Correctly
- Pinpoint Test L: The Front Blower Motor Is Inoperative
- Pinpoint Test M: The Front Blower Motor Does Not Operate Correctly
- Pinpoint Test N: P193E
- Pinpoint Test O: The Rear Blower Motor Is Inoperative
- Pinpoint Test P: The Rear Blower Motor Does Not Operate Correctly
- Pinpoint Test Q: RHVAC (Rear Heating, Ventilation And Air Conditioning) System Is Inoperative Or Not Operating Correctly
- Pinpoint Test R: P06A0
- Pinpoint Test S: Invalid Data Received
- Pinpoint Test T: Module Configuration Fault
- Pinpoint Test U: Internal Module Failure
- Pinpoint Test V: U0140:00
- Pinpoint Test W: U0151:00
- Pinpoint Test X: U0155:00
- Pinpoint Test Y: U0253:00
- Pinpoint Test Z: U1000:00
- Pinpoint Test Aa: U3003:16
- Pinpoint Test Ab: U3003:17
- Pinpoint Test Ac: B10B8:63
- Pinpoint Test Ad: The Auto Start-Stop Deactivation Indicator Is Inoperative Or Does Not Operate Correctly
- Pinpoint Test AE: Insufficient Air Conditioning (A/C) Cooling
- Pinpoint Test AF: Reduced Outlet Airflow
- Pinpoint Test Ag: The A/C (Air Conditioning) Compressor Relief Valve Discharging
- Pinpoint Test Ah: NVH (Noise, Vibration And Harshness) When A/C (Air Conditioning) System Is On
- Climate Control System
- General Procedures
- Air Conditioning (A/C) Clutch Air Gap Adjustment
- Air Conditioning (A/C) Clutch and Air Conditioning (A/C) Clutch Field Coil
- Air Conditioning (A/C) Compressor Leak Detection
- Air Conditioning (A/C) Odor Treatment
- Air Conditioning (A/C) System Flushing
- Air Conditioning (A/C) System Leak Test Using Forming Gas
- Air Conditioning (A/C) System Recovery, Evacuation and Charging
- Condenser Core Leak Check
- Electronic Leak Detection
- Evaporator Core Leak Check
- Fluorescent Dye Leak Detection
- Heater Core Leak Check
- Refrigerant Identification Testing
- Refrigerant Oil Adding
- Refrigerant System Tests
- Removal And Installation
- Air Conditioning (A/C) Compressor - 3.5L Duratec (202kW/275PS)
- Air Conditioning (A/C) Compressor - 3.5L EcoBoost (235kW/320PS)
- Air Conditioning (A/C) Compressor Inlet Line - 3.5L Duratec (202kW/275PS)
- Air Conditioning (A/C) Compressor Inlet Line - 3.5L EcoBoost (235kW/320PS)
- Air Conditioning (A/C) Compressor Outlet Line - 3.5L Duratec (202kW/275PS)
- Air Conditioning (A/C) Compressor Outlet Line - 3.5L EcoBoost (235kW/320PS)
- Air Conditioning (A/C) Pressure Transducer
- Air Distribution Door Actuator
- Air Inlet Door Actuator
- Ambient Air Temperature Sensor
- Blower Motor
- Blower Motor Control Module
- Cabin Air Filter
- Center Registers
- Climate Control Housing
- Condenser
- Condenser Outlet Line - 3.5L Duratec (202kW/275PS)
- Condenser Outlet Line - 3.5L EcoBoost (235kW/320PS)
- Driver Side Register
- Evaporator
- Evaporator Inlet and Outlet Manifold - 3.5L Duratec (202kW/275PS)
- Evaporator Inlet and Outlet Manifold - 3.5L EcoBoost (235kW/320PS)
- Evaporator Temperature Sensor
- Heater Core
- Heating, Ventilation and Air Conditioning (HVAC) Control Module
- Receiver Drier
- Thermostatic Expansion Valve - 3.5L Duratec (202kW/275PS)
- Temperature Door Actuator
- Thermostatic Expansion Valve - 3.5L EcoBoost (235kW/320PS)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.