Blue Bird

[Billyfinley79]

Hello everyone, I have a 1989 Blue Bird with 5.9 cummins. Took out both heaters and reconnected coolant lines. Turned on bus and no leaks so good there. Now my front heater and defrost aren't getting warm. I let bus run for awhile and the radiator where you fill it wasn't even warm. I live in Montana and it was 28 degrees. Any ideas what I need to do or what I did wrong? Coolant in radiator is near top but not full. Thanks for any help. I also took out the heater pump that was near my 2 back heaters when I took them out. Valve is open. Also seems to be little knocking noise where front air comes out.

 

[BennysTire]

System may just need a big burp.
Also did you confirm that your "main" heater core is still in the loop?

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[Billyfinley79]

Hey Bennys tire. My first bus so where would I look to see if main heater core is still in the loop. As big burp goes, you mean take rad cap off and fill til bubbles gone? Thanks for replying