heater lines were clamped shut. I have flow as I touched the lines (quickly because they were very hot) and I have a steep hill in my area that I park on and, with the overflow cap off, let it run for a half an hour. I just needed to replace about a quart of 50/50.

The thing that puzzles me is I bought the car in February 2013 and the heat worked great. It wasn't till this fall when the temps dropped that I discovered I had no heat. By the way the old core was in great shape. It looked like it wasn't the original as it didn't have the telltale discoloration of...

Aftermarket. But I checked with a flashlight in a dark room and didn't see any blockage. I can take it out and clean it as I haven't replaced the plastic panels as I wanted to make sure it worked before I put it completely back together

Yes the hose gets firm. I notice that when I cycle the heater mixing doors that it blows a lot more air when set to cold than when set to hot.

the coolant feed pipes to the heater core get hot but it only blows warm for a few seconds when you turn on the fan then cold air. Warmer by fay than the 7 degrees we have here in wisconsin but not hot.

replaced core on Friday 12/27/13

I replaced the heater core and checked the ECC for proper air mixing door movement. I hear a 'gurgling' noise as if water with air in it is passing through the heater core but I only get heat if it sits with the ecc off then open the vents and it's warmish for a few seconds. How do I bleed the air f...

Quick question. What it it's function? If it fails what can I expect to happen?

Thank you jblacburn! It was a breeze to take apart and clean. Here's hoping the cleaning was enough.

Where is the MAP sensor located? Is it easy to access?