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850 Heater Hoses - Which one is top through firewall? 850 1996

posted by  RobCooper on  Sat Oct 29 11:05 CST 2011
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last visit: Tue May 13 17:31 CST 2014
[RELATED]

Well I forgot to note the orientation of the heater hoses apon removal.....so which hose goes to top and bottom at firewall?

The longer hose goes to engine block and shorter to coolant return pipe.

FYI, I am gutting the plastic fire wall juntion box....taken out the swivel parts with hack saw.

I will then run 5/8" heater hose to the heater core pipes under the dash. I will cut back the aluminum pipes and use hose clamps. I will wrap hose with duct black duck tape as it passes through fire wall box holes.

I think this saves money if I assign $0 for my labor - ha!

Thanks

Rob
96 850 na
92 745T
90 MB 300e








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    850 Heater Hoses - Which one is top through firewall? 850 1996

    posted by  KlausC on  Sat Oct 29 14:26 CST 2011
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    last visit: Fri Oct 24 10:15 CST 2014
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    Your old heater core should tell your that. The pipe that goes to the top is hot. Following any logic, the return hose should be at the bottom as it goes through the firewall.

    It really does not make much difference, the antifreeze always flows through the core regardless of the heat/cool settings.

    The reason that the hoses have a junction at the firewall serve two purposes. In case of an accident, when the engine is moved down and rearward, the hoses will rip off the firewall, not inside of the cabin. Because the inside is metal pipes, the only replaceable hoses are in the engine compartment which makes it easier to replace incase of cracks. Also, there is a lot of engine movement that can chaffe the hoses when they go through something solid and without movement.

    Klaus
    --
    Did you do your Random Act of Kindness today?







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