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, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 617 (CLIMATE CONTROL SYSTEM - GENERAL INFORMATION (DIAGNOSIS & TESTING - GENERAL PROCEDURES))DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEM - VEHICLES WITH: DUAL AUTOMATIC TEMPERATURE CONTROL (DATC)SYMPTOM CHARTSSYMPTOM CHART - CLIMATE CONTROL SYSTEMS
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWD
Symptom Chart - Climate Control Systems
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWDSECTION Symptom Chart - Climate Control Systems
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Some Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) may inhibit Air Conditioning (A/C) operation. If any Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to Diagnostic Trouble Code (DTC) Chart .
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
| Condition | Actions |
|---|---|
| Externally Controlled Variable Displacement Compressor (EVDC) poor performance/does not operate correctly | GO to Pinpoint Test S |
| A module does not respond to the diagnostic scan tool | REFER to: Controller Area Network (CAN) Module Communications Network . |
| Insufficient Air Conditioning (A/C) cooling | GO to Pinpoint Test V |
| The A/C is inoperative NON HEV | GO to Pinpoint Test F |
| The A/C is always on -- A/C mode always commanded on NON HEV | GO to Pinpoint Test G |
| The A/C pressure relief valve is discharging | GO to Pinpoint Test U |
| AIR CONDITIONING (A/C) ELECTRIC COMPRESSOR INOPERATIVE OR OPERATING POORLY AIR CONDITIONING CONTROL MODULE (ACCM) | GO to Pinpoint Test Y |
| The air inlet door is inoperative | GO to Pinpoint Test C |
| The blower motor is inoperative | GO to Pinpoint Test J |
| The blower motor does not operate correctly | GO to Pinpoint Test K |
| Incorrect or erratic direction of airflow from outlets | GO to Pinpoint Test D |
| Insufficient, erratic or no heat | GO to Pinpoint Test E |
| Reduced outlet airflow | GO to Pinpoint Test W |
| The temperature control is inoperative or does not operate correctly - driver side | GO to Pinpoint Test H |
| The temperature control is inoperative or does not operate correctly - passenger side | GO to Pinpoint Test I |
| The electric booster heater is inoperative or does not operate correctly | GO to Pinpoint Test T |
| NVH when the A/C is on | GO to Pinpoint Test X |
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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.