ok guys i was on the way to work this morning and my truck wouldnt blow any warm air. fan is working and i know its not the thermostat. the other day i pulled my pcm to get the code for ordering my chip but idk how that would of affected the heater. any ideas?

 

Possible heater core issue.

 

idk i used it about a week ago and had no problem.

 

Vacuum leak making it so the ducts don't operate correctly. Put it on defrost and check to see if you get full blast up there, then turn it to dash vents and see if it comes out full blast there. Willing to bet its not coming out correctly. If so start checking the hoses down to the auto hubs, they're probably cracked.

 

it all comes out the same. i put my chip in today and now its working dont know if something just didnt reset right or what