Restrictor in passenger coolant hose?

Discussion in 'V8 5.0L Engine / Mods: Bolt-ons, Exhaust, Tuning' started by lx347cd, Sep 10, 2019.

  1. lx347cd

    lx347cd Well-Known Member

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    So Im doing my Whipple install and there is a restrictor pipe inside the passenger side hose area that needs to be reused?
    I show a picture here. Anyone know what the purpose is for? Im assuming to restrict flow for some reason? Just curious because the driver side does not have it- just passenger. coolant hose.jpg
     
  2. 88lx50

    88lx50 Well-Known Member

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    It's usually there to restrict flow to the heater core. Probably so it doesn't get blown out by added flow/pressure.
     
  3. Cobra Jet

    Cobra Jet Well-Known Member

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    ^^^ 100% correct.

    These were also common in the 1986-1995 5.0’s. In those models, the restrictor fitting was made of steel; it was only found in 1 hose located at the firewall which went into the heater core. The problem is, if someone didn’t know about that tidbit of tech info and replaced/discarded the stock heater hose, the restrictor was gone... new 86-95 5.0 heater hoses didn’t come with the restrictor.

    ——

    Good find and hopefully your post helps other S550 owners in the future.
     
  4. Lime1GT

    Lime1GT Well-Known Member

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    I would say it's there to slow the flow down so the core absorbs more heat from the coolant to be more efficient.
     
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