Cockpit temp is not controllable. 737-6/7/8/900

Cockpit Temperatur is very cold, than hot and cold again. The temperatur selector has no effect and the cabin temperature controler shows no faults.
Check the airfan, located downstream of the cockpit temperature bulb.If the fan is not running, clean or replace the fan. Also check the filter in the cockpit ceiling, it might be clogged.

Thanks to Thomas H. for his input !

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