Joined in 2023 
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Just spent 5 hours trying to sort out a problem with the Heater Control Unit on my 2013 Fiesta Zetec. How stupid of the designers to anchor a strong wire in a cheap plastic control. Strong hands may turn the temp knob too far. My mk7 Fiesta with automatic climate control came up with a fault of only blowing cold air through all the temperature settings and what ever I read on Google said the heater resistor. If the wire (1/4 inch end-ball) is detatched from the plastic half-dial, it could make a noise when loose from its mooring.
After hours of frustration, the repair had to be abandoned, it was simply too difficult to service. turn on engine and hey presto the spline is in the correct position. (try changing the flow direction on panel and the spline seems much better to be inline with the white plastic clip). ps. my last posting was done after 01:30 and I was really nodding off to sleep, after the 5-hr battle to access behind the Media Unit and Heater Control Unit. My 2013 Fiesta heater control unit cannot be manually reconnected to the control wires that sprang out of position in the course of selecting the direction of warm air from the heater. I think that is what happened to me when I rotated the selector wheel (dial) on the central front part of the Heater Control Unit.
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Automatic climate control Mk7 Fiestas have 3 actuators fitted due to all the automation and no matter how hard you google there isn't any thing out I phoned up Ford today though, guy was great and told me, this actuator, ( VP1S7H19E616BB) is found in three places throughout the fiesta heater system. We assumed for recirculation, hot and cold air, then air direction. Test the actuators by removing the 2 torx screws and operating the relevant control if actuator works then it's the flaps. Mine was the arm that went from the actuator to the hot / Cold Flap. actuator is by the drivers left leg (by the drivers left foot is a panel with 1 screw and some clips) it's on the right side of the heater but the leg air bag is in the way (I managed to remove the actuator with a torx bit and a 1/4 drive spanner and left air bag in place) this controls the hot / Cold flap this is the one that broke on me
actuator is behind the glove box (need to remove the glove box complete 2 pins attach it and its in front of you by the fusebox) this controls the Recirculation flap these wires have small spherical ball on the end, intended to make a secure, fixed connection. but the way they connect to the rear of the heater control panel is not secure at all). Top comes off first, then unscrew the Media (radio/CD control unit), the 2 screws, leave the 2 silver nuts there untouched as not affecting removal. if it's not this then go to left hand side passenger footwell there are 2 pipes these should be very hot if they aren't then youve possibly got a heating problem within the cooling system Due to not being able to find any help on this post I thought I would join you all and hopefully help anyone who is having climate control heater problemsRight hand dive locations (left hand swap driver and passenger round) all are mounted on the heater unit and Haynes say remove the whole unit No it's not the heater resistor as that controls the fan speed. This is on right side of the heater by passengers foot (by the passengers right foot is a panel with 1 screw and some clips) The actuator is only screwed on with 2 torx screws I will say one is a pig to get to I ended up using a 1/4 inch torx bit and a 1/4 spanner undoing bit at a time
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