I need to locate the heater inlet hose to install a flush tee. There are (2) heater hoses on the drivers side firewall, lets call them the innerand outer. Does anybody know which one is correct? One hose goes to the engine block, the inlet hose. The other hose goes to the water pump, the outlet hose.

 

This should help:

 

NovaResource,
Thanks for the reply. Nice diagram. These diagrams don't usually map directly to how things are installed under the hood.

There is an inner and outer hose on the firewall. I'm not sure which hose is the heater inlet hose.