Well thats your problem!!! CEL light came on coolant temp is not getting up to operating temp in the correct amout of time, thermostat is not even 6 months old with less then 5k on it!!
went back to stock thermostat and i'm still having problems burping or something. Tested thermostat and it opens, jiggle pin pointed up, just the lower radiator hose is cold when car is up to temp. filled engine then radiator, removed the little hose on the radiator and filled till a steady stream came out from the small hose on the passenger side. had the car tilted sideways and everything