I probably would have forgotten that. I didn't remember removing it, when we pulled the unit apart.Don't forget to leave halves slightly open when installing into vehicle, so that temp sensing for Heater Control Valve can be reinstalled.
You are correct. On PV series cars, the tube is usually poked through the duct on the passenger side of the firewall.Ron,
The temp sensor probe/tube or what ever it's officially called, looks to stay on the interior side of the firewall, not between the actual halves of the heater core housing, as far as I can see. It's coiled up under my dash, but in reach of the spot where the heater core bolts onto the car.