I removed the ventilation system over the weekend to clean out the debris and get it working better. I did everything I intended on doing, and put everything back exactly like it was before. But now I am not getting the heat I used to out of the heater core.
A little background first off: On my road trip home from the mountains, my water pump went out, and then my thermostat. By the time the thermostat went out however, I was in the middle of nowhere, and out of cash. So I just pulled the old thermostat out to make it home without losing all my fluid.
After breaking my transmission, I figured I'd use the down time to repair the little stuff. I originally intended on just repairing the defroster duct, but then I got carried away and pulled the entire thing out, figuring if I have the antifreeze out for the thermostat, now would be a good time to pull the core and ventilation system as well.
So I did just that. I flushed the heater core and cleaned everything up, lubricating moving parts and such. I put everything back together again, and the system works better than before with a few exceptions. The main one is that the heater puts out cool air instead of hot.
I have read more than a dozen threads about this same subject so far today, and from what I can gather, everything is hooked up correctly. Here is a picture of how it sits right now:
According to much of what I have read here, this is the correct way to connect the hoses, and it is the exact same way they came off. After I got everything back together, I left the cap off the radiator and burped the system, though I must admit I didn't actually lift the front end up or anything like that. My tranny is pulled out right now, and I have a jack under the engine so as not to cause undue stress on the motor mounts. And I do not have a temp gauge in the Jeep yet either, though I bought one this afternoon.
After I burped the engine and got the proper amount of fluid in it, I turned on the heater to test the temperature. It was cool air, cooler than the air outside actually. I grabbed the hoses under the hood to find out if they were hot, and all but the top line to the core were hot. Even that one was hot on both sides, but cool in the middle. I lifted it thinking there was an air bubble trapped somewhere, but it remained cool to the touch.
I have double checked the heater box, and everything works just fine except for the vents that open from the outside. All I have right now is recirculated air, but the rest of the system works great. Problem is, there's just no heat.
So where did I go wrong here? I sealed everything up real good so there are no leaks, I hooked everything up properly, and I flushed the core before installing it, making sure it wasn't plugged.