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- Jul 16, 2021
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- 2022 Mach-E Premium AWD
|TECHNICAL SERVICE BULLETIN|
Lack/Loss Of Heat While Driving During Freezing Temperatures
05 May 2022
2021-2022 Mustang Mach-E
Issue: Some 2021-2022 Mustang Mach-E vehicles may exhibit a lack/loss of heat while driving during freezing temperatures. This may be due to the heating ventilation and air conditioning (HVAC) control module software. To correct the condition, follow the Service Procedure to update the HVAC software.
Action: Follow the Service Procedure to correct the condition on vehicles that meet all of the following criteria:
- 2021-2022 Mustang Mach-E
- Lack/loss of heat while driving during freezing temperatures
1. Reprogram the HVAC control module using the latest software level of the Ford Diagnostic and Repair System (FDRS) scan tool.
NOTE: Recommend the customer use AUTO mode and adjust the temperature to maximize heater performance.
This is the follow-up to SSM 50645 announcing this fix was coming. This will hopefully improve the heat for users that were complaining about poor output in non-extreme conditions. However I still expect design limitations when the temp gets down to -25ºC/-13ºF, heat may be increasingly limited below those temps. Setting a departure time in those conditions is virtually required to pre-warm the battery pack (remote start does not heat the battery). The heater is not powerful enough to warm both the pack and the cabin simultaneously in extreme cold. The pack is also slow to warm due to its large thermal mass (may take ~1+ hour to warm up).
Per the note in blue above, I'd recommend using the lowest AUTO (one dot) setting and adjusting the temp to suit in extreme cold temps. Keeping the fan speed as low as possible will provide the warmest air.
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