Discussion Starter · #1 ·
Has anyone had this problem or have a suggestion? I just installed a new heater core in my 2000 Silverado. I then pushed a Dorman 800-409 3/4" tube to 5/8" hose quick disconnect heater hose fitting onto the outlet(?) tube and quickly felt the inner seals of that fitting become tight on the tube. Being very concerned not to damage the heater core, I tried to twist the fitting and push it to the lip and click in place. Now the fitting seems to be stuck somewhere short of the intended position. Some in-town driving has not blown the fitting off. I suppose that would require more pressure than the cooling system creates, but what would you do? Would you trust the fitting to stay on the heater core? Would you disconnect the hose when the engine is still warm (but safe to handle) and try to move the fitting? Would you cut the fitting carefully and remove it and replace it with another brand? Here's another thing I don't get -- it turns out that the tubes on the new heater core are not the same size. The side I believe to be the inlet is 3/4", while this one I'm dealing with is 5/8". How could a 3/4" fitting, which is supposed to be the correct match for the Silverado, get hung up on a smaller size tube?