I am not sure if anyone has had this problem here, but sometimes my heater and A/C dont work. The light on the dash doesnt come on at all when it is not working. And i get no heat either. I can watch the a/c clutch going on and off. Coolant level is fine. It is not overheating or staying cold. Somedays it will all work fine and on others it wont. Is there a relay or sensor somewhere that i cant think off that could be starting to die?
thanks

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2005 Jeep liberty sport.