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Message: <blockquote data-quote="BMW6161" data-source="post: 298461" data-attributes="member: 11735">Bro, first let us understand our E46 air-con and heater system. E46 heater system is using hot water which warm up from our engine and control by heater valve located under the air filter box. if the heater valve is spoil (leak) then hot water will go throught to heater radiator which located under dashboard next to air-con cooling coil. At this time u would not get "cool air" any more. imagine if the heater radiator is hot and just near to cooling coil by then cool air will become hot. rite?so, I taken out my heater valve whether is spoil or not since i dun want "Hot air" at all. Now no more hot water go into the radiator and just the cool air. hope this can help who having same problem. enclosed image for yr reference<img src="http://i294.photobucket.com/albums/mm107/kwanmeng/ODM4MzZfcA.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>