I would like to bypass the acc servo on my 79 300TD, and can't seem to find a definitive thread on : which heater hose to install the SHUTOFF VALVE in.

Could someone who knows please advise me on this: When facing the front of the car there
are 4 lines attached to the servo unit: the front left and the front right(which has the auxilary pump running into it). Then there are the rear left, and the rear right.

Which is of these is best to install the shutoff valve(as to stop heat from coming into the car, but not affect the engine cooling)

THANKS for your thoughts on this one.