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Yesterday I was in my 2009 Ram 5.7 SLT and it overheated... I was like WTF?!?!. Truck ran like a champ yesterday... I pulled over, let it cool. Went to nearby parts store and got some coolant and a thermostat. I'm getting a service code of P2181. So i changed the thermostat and added coolant. Started the truck and now I'm not getting a coolant temp reading. Also not getting any warm air thru my vents. The warm air kicks on after awhile. I do not see any coolant leaking anywhere. Could it be Coolant Temp Sensor? Water pump? I'm scratching my head here...

Please help!
 

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If your coolant level is good, and your t-stat is new and good, then the next logical thing to change is the coolant temp sensor, yes.
 

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air lock is my guess as well.
 
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