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HOMESERVICE MANUALSFORD2021TRANSIT-350 HD BASE, VAN CARGO EXTENDED, 3.5L ENG VIN 8, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 34 (CLIMATE CONTROL SYSTEM - GENERAL INFORMATION)DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEM - VEHICLES WITH: DUAL AUTOMATIC TEMPERATURE CONTROL (DATC)SYMPTOM CHART(S)SYMPTOM CHART: CLIMATE CONTROL - DUAL AUTOMATIC TEMPERATURE CONTROL (DATC)
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWD
Symptom Chart: Climate Control - Dual Automatic Temperature Control (DATC)
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWDSECTION Symptom Chart: Climate Control - Dual Automatic Temperature Control (DATC)
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to: Diagnostic Methods .
NOTE:
Some PCM Diagnostic Trouble Codes (DTCs) may inhibit A/C operation. If any PCM Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to DTC Chart: Powertrain Control Module (PCM) .
| Condition | Possible Sources | Actions |
|---|---|---|
| A module does not communicate with the diagnostic scan tool | Fuse(s) Wiring, terminals or connectors FCIM |
REFER to: Communications Network . |
| Unable To Duplicate The Customer Concern And No Diagnostic Trouble Codes (DTCs) Present | Refer to Pinpoint Test | GO to Pinpoint Test C |
| HVAC functions are inoperative/do not operate correctly from touchscreen only | Communication network FCIM APIM |
Refer to the appropriate Information and Entertainment Systems article for the procedure. |
| Reduced outlet airflow | Plugged cabin air filter | INSPECT the cabin air filter. Refer to: Cabin Air Filter . If OK, DIAGNOSE for low refrigerant charge, A/C always commanded on or blower motor not operating correctly. |
| Improper refrigerant level | CARRY OUT the refrigerant system tests. Refer to the appropriate Refrigerant System Tests procedure in the appropriate Climate Control Systems article. If refrigerant charge is OK, GO to Pinpoint Test H | |
| Blower motor | GO to Pinpoint Test L | |
| The air inlet door is inoperative | Refer to Pinpoint Test | GO to Pinpoint Test D |
| Incorrect or erratic direction of airflow from outlets | Refer to Pinpoint Test | GO to Pinpoint Test E |
| Insufficient, erratic or no heat | Refer to Pinpoint Test | GO to Pinpoint Test F |
| The A/C is inoperative | Refer to Pinpoint Test | GO to Pinpoint Test G |
| The A/C is always on - A/C mode always commanded ON | Refer to Pinpoint Test | GO to Pinpoint Test H |
| Temperature control is inoperative/does not operate correctly - driver side | Refer to Pinpoint Test | GO to Pinpoint Test I |
| Temperature control is inoperative/does not operate correctly - passenger side | Refer to Pinpoint Test | GO to Pinpoint Test J |
| The blower motor is inoperative | Refer to Pinpoint Test | GO to Pinpoint Test K |
| The blower motor does not operate correctly | Refer to Pinpoint Test | GO to Pinpoint Test L |
| Insufficient A/C cooling | Improper refrigerant level | CARRY OUT the refrigerant system tests. Refer to the appropriate Refrigerant System Tests procedure in the appropriate Climate Control Systems article. If refrigerant charge is OK, DIAGNOSE for a temperature door actuator not operating correctly. |
| Temperature door actuator | For inadequate temperature out of the driver side, GO to Pinpoint Test I For inadequate temperature out of the passenger side, GO to Pinpoint Test J |
|
| A/C pressure relief valve discharging | A/C pressure relief valve | CHECK the high side system pressure. If the pressure is below the A/C pressure relief valve open pressure, 3, 447-4, 137 kPa (500-600 psi), INSTALL a new A/C Compressor. REFER to: Air Conditioning (A/C) Compressor - 6.2L V8 . REFER to: Air Conditioning (A/C) Compressor - 6.8L Triton-30V - V10 . REFER to: Air Conditioning (A/C) Compressor - 6.7L Power Stroke Diesel . |
| High system pressure | CHECK the high side system pressure. If the system pressure is above the A/C pressure relief valve open pressure 3, 447-4, 137 kPa (500-600 psi), REPAIR the A/C system for a restriction. | |
| Climate control does not operate only when remote start is used | IPC information display settings Non-Ford approved remote start system installed |
VERIFY Remote Start - Message Center Set To Auto, or Remote Start - Message Center Set To Last User Settings. Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description . VERIFY module communications network operation. DIAGNOSE Diagnostic Trouble Codes (DTCs) if present. |
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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.