Heater Core Bypass - 89 535i E34 model

[angusbn]

Just to reconfirm, to bypass the heater core on a 89 535i E34 model I simply use a plastic "T" an connect hoses 2 & 3 to the horizontal on the tee and hose 1 to the vertical on the tee.

Hose 2--|--Hose 3
|
|
Hose 1

Hoses #2 & #3 are the coolant-in and hose #1 is coolant-out (return).

Thanks.

[Ferret]

Connect hose #23 to the output on top of the pump (#1)

[angusbn]

Ferret,

As per the diagram, I thought that I would "T"-connect hoses #21 and #22 to hose #23

Hoses 21 and 22 are water-in and hose #23 in water-out so that would by-pass
the heater core.

Please correct me if I'm wrong before I start the work.

Thanks..

[Ferret]

Ferret,

As per the diagram, I thought that I would "T"-connect hoses #21 and #22 to hose #23

Hoses 21 and 22 are water-in and hose #23 in water-out so that would by-pass
the heater core.

Please correct me if I'm wrong before I start the work.

Thanks..

Yeah that's fine, just make sure you leave your heater on flat out cold mind, you'll end up running it as a radiator bypass otherwise.

[angusbn]

Ferret,

Sorry I don't understand what you mean by "leave your heater on flat out cold mind". Maybe I'm being thick.

Yeah that's fine, just make sure you leave your heater on flat out cold mind, you'll end up running it as a radiator bypass otherwise.

[Paul in NZ]

leave your heater control(s) on cold,to make sure turn the drivers dial all the way past the "click" on coldest position

[angusbn]

Bypassed the heater core by installing a few plastic "T"'s and 90 degree elbows - looks OK - no leaks - have no heater now so wouldn't be drive it in our extreme Canadian winters.

leave your heater control(s) on cold,to make sure turn the drivers dial all the way past the "click" on coldest position