Hello Blazer owners I am a new Blazer owner just bought my first 4 months ago. Got a 2000 Chevy Blazer ( my dream vehicle).I have always wanted one. Well I am having troubles and no one seems to know what could be causing it. I have no heat. and with living in PA with temps lately in the 20's everyday it gets pretty chilly without a heater. It is odd had heat till Thanksgiving day, went out and started the truck and just didn't seem to warm up. I thought might be due to that it was only 11 degrees out, the next week had heat back but it was warmer too. Now this past week i barely have any you can feel it there, but just no where near as warm as should be or was. Now I have had talked to about 10 different mechanics including my dad who has worked on Chevy's for 40 yrs. They all seem to be lost. Seems to be blowing both cold and luke warm air. We have changed the thermostat. The fluids are full the radiator is full. The hises that go into the heater core are warm to touch, but i was told you should not be able to sit there and hold them and you can. Please Help!!!