Heater not working, just 37 degrees output.

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Hi.

I´v got a Citroen C5 2002 that i´m fixing for a friend.
The aircon heater only outputs 37 degrees celcius accordning to autocom at full heat.
It´s an dual aircon, and it´s the same temperature on both ducts.
I´ve been trying to look inside at the flaps but they doesn´t look broken.
All 3 flapmotors are working, no faulty axels.
The heater matrix have been removed and properly flushed, reinstalled and bleed.

Is there a rod controlled flap before the heater matrix thats connected to the other flaps that can be faulty?

All help is welcomed!

[Peter.N.]

Is the water temperature gauge reading correctly, if not I would suspect the thermostat.

Peter

[Hell Razor5543]

Something else to consider is the external temperature sensor. How hot does the C5 think the outside is? If it is faulty, the aircon will be mis-informed and weird temperatures will result.

[Peter.N.]

Yep that's true, had it myself. Is the external temperature reading correctly?

Peter