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 34 (CLIMATE CONTROL SYSTEM - GENERAL INFORMATION)DESCRIPTION AND OPERATIONCLIMATE CONTROL SYSTEM - VEHICLES WITH: DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) - SYSTEM OPERATION AND COMPONENT DESCRIPTIONSYSTEM OPERATIONAUTO
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWD
System Operation: Auto
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWDSECTION Auto
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.
When AUTO is selected:
- the HVAC system operates to achieve and maintain the temperature requested by the operator.
- the driver and passenger side temperature doors are automatically controlled by the FCIM based on the temperature setting.
- the A/C compressor is automatically controlled by the PCM based on temperature information sent by the FCIM. 32.0 °F (°C).
- the blower motor speed is automatically controlled through the blower motor speed control when it receives a PWM signal from the FCIM based on the temperature setting, but can be manually adjusted if desired.
- the FCIM controls the air inlet door to recirculate, partially recirculate or open to the fresh air position depending on the in-car temperature and humidity sensor inputs.
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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.