This is my first post so here it goes. I have 2005 sport, that just recently the heat and air conditioning started to work when ever it feels like it. When it is not working the light on the dash for A/C doesnt even come on and i get no heat either. The engine is not overheating or always cold. So i cant figure what would make it work sometimes and do nothing others. Is there a relay or sensor that controls A/C and the heat.
Thanks

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2005 Jeep liberty sport.