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Discussion Starter #1
My ageing but still lovely old 535i has developed a quirk with it's heating. Car starts and hot air is forthcoming almost immediately. If you drive for about 20 mins the hot air disappears and nothing on the control panel seems able to bring it back.
The fan control is all fine and the aircon works very well. I'm inclined to think this is a stat somewhere rather than the hedgehog. Any suggestions?
 

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Sounds like failed fan inside IHKA (AC control unit). It draws air inside the module thru the slots for interior heat sensor. When the electrics inside the unit warm up after a while the sensor will think temp is higher if the interior fan does not work. You can try unplugging the connector on water valves and they should be permanently open.
 
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