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 INFORMATIONDIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMSYMPTOM CHARTSSYMPTOM CHART - CLIMATE CONTROL SYSTEMS
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, RWD
Symptom Chart - Climate Control Systems
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, RWDSECTION Symptom Chart - Climate Control Systems
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 the DTC Chart: PCM.
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
Symptom Chart
| Condition | Actions |
|---|---|
| A module does not respond to the diagnostic scan tool | REFER to: Communications Network . |
| Insufficient Air Conditioning (A/C) cooling | GO to Pinpoint Test AE |
| The A/C is inoperative | GO to Pinpoint Test I |
| The A/C is always on -- A/C mode always commanded on | GO to Pinpoint Test J |
| The A/C pressure relief valve is discharging | GO to Pinpoint Test AG |
| The air inlet door is inoperative | GO to Pinpoint E |
| The front blower motor is inoperative | GO to Pinpoint Test L |
| The front blower motor does not operate correctly | GO to Pinpoint Test M |
| The rear blower motor is inoperative | GO to Pinpoint Test O |
| The rear blower motor does not operate correctly | GO to Pinpoint Test P |
| The electric booster heater is inoperative or does not operate correctly | GO to Pinpoint Test A |
| The RHVAC system temperature door or air flow door is inoperative or not operating correctly | GO to Pinpoint Test Q |
| Incorrect or erratic direction of airflow from outlets on the front system | For front HVAC air flow concerns GO to Pinpoint Test G |
| Incorrect or erratic direction of airflow from outlets on the rear system | For RHVAC air flow concerns, GO to Pinpoint Test Q |
| Insufficient, erratic or no heat | For engine coolant/heater core related concerns, GO to Pinpoint Test H For electric booster heater related concerns, GO to Pinpoint Test A |
| Reduced outlet airflow | GO to Pinpoint Test AF |
| The front temperature control is inoperative or does not operate correctly | GO to Pinpoint Test K |
| Unable to duplicate the customer concern and no Diagnostic Trouble Codes (DTCs) present | GO to pinpoint Test F |
| NVH when the A/C is on | GO to Pinpoint Test AH |
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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.