I just installed a water pump on my 87 yj inline 6 cylinder. Wow my lines were shot. Anyway, I got the new one on filled the radiator, and started it. It ran good, but then the air didn't get warm for my heater ( it did prior to install) and after a bit it starts making a screaming noise...could I have not put in enough coolant? I am so frustrated with this :banghead: and really hope I don't have to take it back. Anyone else face this problem?