Heater hose question

[MotorHead Lon]

I've searched and not found anything. I need to know which hose goes where on my heater hoses. I have an outlet on my radiator and want to use it. I've had this truck apart for 8 years and I forgot where some things go.

Thanks for any help.

[ray_mcavoy]

The smaller (5/8" ID) hose is the feed to the heater core. It attaches to a fitting on the intake manifold (V8) or to the lower thermostat housing (inline-6).

The larger (3/4" ID) hose is the return from the heater. It attaches to either the port on the water pump or to the radiator.

[geezer#99]

Just to add to ray's info.
5/8 to bottom of heater core.
3/4 line out the top of heater core.

[wilkin250r]

I believe the original configuration, if it matters, is the manual transmissions routed the return line to the water pump, the automatic transmissions routed the return line to the radiator. But I doubt you would run into any problems swapping those configurations, I don't think running the return to the water pump would significantly shorten the life of your automatic transmission.

[MotorHead Lon]

Thanks for the replies. That's a big help. I've already had the hoses hooked up, and now they are too short. So I'll just wait until cold weather to connect it.