Heater Pipe and Hose Component Installation Note

Insert the heater pipe into the heater hose until the hose reaches the bracket or the protrusion on the pipe.
When the rear heater pipe is removed, bleed the air from the rear heater pipe thoroughly after refilling the engine coolant to prevent air from being trapped in the rear heater pipe.

Fig 1: Identifying Right Or Wrong method Of Heater pipe And Hose Installation
Courtesy of MAZDA MOTORS CORP.
Install the rear heater pipe and rear cooler pipe securely as shown.

Fig 2: Installing Rear Heater Pipe And Rear Cooler Pipe
Courtesy of MAZDA MOTORS CORP.