Heat at idle, No heat at high rpms Help!

[ZekeTheSneak]

Just put in a new motor in my e30, I believe the Hoses are hooked u properly but there is heat at idle but none at high rpm. Help?

[FredK]

You have reversed the heater core inlet and outlet hoses.

[Danny]

See now when I did this it did it for a small time and then my heat worked at high rpms after about 3 weeks.

And now I have a small leak inside the cabin at the heater core pipes :|

Switch them.

[87e30]

My heater would work initially then no heat would come out.

Switch them.

[ZekeTheSneak]

thanks i will when possible, Anyone have a layout or diagram of the proper flow? I searched when i installed and found nothing.

[7pilot]

Back of the head to the bottom pipe on the firewall.


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[z31maniac]

thanks i will when possible, Anyone have a layout or diagram of the proper flow? I searched when i installed and found nothing.

Just take the two coolant pipes that go into the firewall and switch them.

Simple as that.