Ok..so I installed the Z1 heater hoses and oem Tee some time ago and had the other hose in my trunk.

I asked a shop to put it in for me and they claimed that they did..

Does anyone know where that supply/return?? Heater Hose (that is not part of the famous two tee hoses) is located??

I thought it was the on the driver's side around the steering shaft and behind the left head going into the firewall.

That hose was not replaced.

That hose never seems to be mentioned when talking about the heater core hoses...no pics..nothing.

Thanks

Metal tube right above the headers. It then routes below the plenum and throttle body. I can probably get a pic later if you need one, it's tucked in fairly tight with the wiring harness.

I would like to see where the hose is..yes please.
Thanks!!!

Ok this is looking straight down below the intake tube. The Z1 hose in the picture is the PCV hose, yours may be in a slightly different location since I'm running a 350Z intake tube. I drew a red line across the length of the heater core hose. There are TWO hose clamps on mine since it was slightly leaking at the connection to the metal line above the headers, I just moved the factory clamp forward and put a regular worm-drive clamp on it to tighten it up more.