[76stepsidechevy]

I've got the lukewarm heat going on too, its warm if you put your hand right under the vent but it doesn't really make it into the truck. About halfway through my half hour trip to work its not cold anymore but its not warm either. I tried flushing the core about two weeks ago and it didn't really get any better. I did notice a bunch of rotten foam blowing out of the vent and defrost when I first got the truck im assuming that was a seal on the flapper. Im about to bite the bullet and get a new heater core. Everything else has been done.