Hey guys, I have a 1996 Lumina, and my heat went out, sorta. It stopped working, so I bought a new relay, popped it in Fan Cont 1 and nothing. Popped it in Fan Cont 2, still nothing, so I just left the new one in. Swapped out the fuse for the Blower Motor. Nothing. But after that the heat blows fairly lightly while I’m driving. I then topped off the coolant, and bleed the system, and still only working while driving. Obviously there’s a few things related to the heat/blower fans, but does anybody know if there’s a precise thing that I need to replace or fix? Nothing I find online is specific to my problem so I don’t want to have to buy all the parts and replace everything possibly connected to my problem if I don’t have to.

 

Is the blower blowing? My guess is the thermostat has failed, open. Do you have any movement on the temperature gauge with it running, "warmed up?"

 

No, I forgot to mention that. The gauge didn’t work before the heat stopped working. It’s always saying it’s at 100. Before I swapped out the relay, if I turned the fan off completely it would go to the middle sometimes, and back down to 100 when I turned them on even though nothing was coming out of the vents.

 

With it "cold", and running, squeeze the top radiator hose, if you feel flow through it, replace the thermostat. This isn't as easy as it sounds.