Which heater hose is IN and OUT??

[skeeters65]

2002 F-Body LS1

Which hose off the water pump is the IN and OUT??

Also which is the IN and OUT on the Heater Core? 69 Camaro small block non-A/C heater core??

Also can I just loop the 2 on the Water pump just for initial start up??


Thanks

[parsonsj]

Small diameter is from the pump. Bigger diameter is the return hose.

I think the heater core is the same way.

Yes, looping on the water pump is fine for initial startup.

jp

[CarlC]

Can't screw it up. Hook the 3/4" heater core hose to the larger outlet on the pump. Hook up the 5/8" to the smaller.