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Hi!

I´m owning a Peugot 308 1,6 HDI -08 sedan. For almost a month ago the heat stop blowing into the coupe. Fans are up and running and so is the engine temperature (changed thermostate this summer). But threre is only a weak warm air zipping through the middle fan pipe in the central console.

Could you help me where to start troubleshooting?
 

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As the thermostat was changed, a likely cause is that the cooling system was not bled fully, so try bleeding it again.
 

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The heat worked following the thermostat change? Then I would suspect the heater matrix is clogged up.
The other possibility is that the control flaps are stuck and they only allow cold air through.
 
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