318is Cooling System Questions

[Zekerbox]

Hello all. I'm looking for someone to assist me with my E30. I am rebuilding most of the stuff on the car and I have some parts from my old E30 build. I want to get rid of the M42 radiator. I have a Mishimoto E30/E36 radiator and I want to get it plumbed up correctly. The previous owner of the car disconnected the heater core and I want to get it plumbed back in correctly. I tried to reverse engineer the diagrams from Realoem but I'm having hard time figuring out how to get things plumbed up with it being a 318. Plumbing the radiator to the pump is pretty self explanitory. The car is OBD1 converted and the spider hoses intake manifold hosing is deleted. Questions would be:

what would be the best option for overflow and heater function(I have a late model tank, early model tank and a chasebay universal)?
can I plumb the heater core in with generic hoses or OEM and if so where should it be routed?

Hope all that makes sense

[mtech325]

For my 318is m42 to obd1 24v swap I used the following:

• m20 late model expansion tank mounted like a late model 325i on driver side & e36 expansion tank cap
• m20 late model spider hose which runs along the block to the heater core, plus has the correct T-section to properly connect to the m20 expansion tank
• m20 late model hose that runs from back of head to heater core
• e36 6-cylinder radiator hoses (Mishimoto radiator fitment might be a bit thicker than OEM Behr style radiator so might want to check fitment---worse case you can get generic auto parts store hose and trim to fit)

The other bit i needed was the 6-cylinder lower plastic radiator support post, as the m42 has a longer one to compensate for the smaller size of the m42 radiator

[Zekerbox]

For my 318is m42 to obd1 24v swap I used the following:

• m20 late model expansion tank mounted like a late model 325i on driver side & e36 expansion tank cap
• m20 late model spider hose which runs along the block to the heater core, plus has the correct T-section to properly connect to the m20 expansion tank
• m20 late model hose that runs from back of head to heater core
• e36 6-cylinder radiator hoses (Mishimoto radiator fitment might be a bit thicker than OEM Behr style radiator so might want to check fitment---worse case you can get generic auto parts store hose and trim to fit)

The other bit i needed was the 6-cylinder lower plastic radiator support post, as the m42 has a longer one to compensate for the smaller size of the m42 radiator

Thanks, that helps a lot. So that kinda answers the question about the hose that attaches to the expansion tank. I ordered the lower radiator mounts from a 6 cylinder already. Did you have the provisions to mount the expansion tank on the driver side? I'll poke around and see if I can find a picture of how someone mounted it unless you have some pictures.

[Zekerbox]

Can you tell me if I need the upper or lower hose into the heater core? 1 or 2?

[TobyB]

1 is into, 2 is out of!

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