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mike_a_mechanic, ASE Certified Technician
Category: Peugeot
Satisfied Customers: 5471
Experience:  17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
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407 coupe diesel hdi set heater to max and only lukewarm heat

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407 coupe diesel hdi set heater to max and only lukewarm heat comes out vents.
put on internal flow and car is warm but not max heat.

put on screen auto and cold air blows out of driver side whilst passenger side blows lukewarm heat.
Hello, welcome. My name isXXXXX will do my very best to assist you with your question. I apologize if you have been waiting long for a response.

From what you are describing the issue that you are having is with the blend door actuator/heater actuator. There is a small electrical motor that control the heat flow and these are common to fail. The dash will have to be removed in order to replace this part.
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