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Don't know what this is called

I need to know what that coupling-circled in green- on the top heater hose is called-

  • hairline crack

    Votes: 1 100.0%
  • seeping a little anti-freeze

    Votes: 0 0.0%

  • Total voters
    1

Den N

New Member
Joined
July 14, 2018
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City, State
carlinville ill.
Year, Model & Trim Level
2005 ford explorer
hose.jpg
what is this calledView attachment 160972
 






Red lines are posts for eng cover. Blue circle is iac idle air control. Green circle is restrictor for coolant line. Theory is to slow coolant flow so it doesn't prematurely wear out heater core.
 






if that green circled item has a vacuum line running to it, it's probably a heater core bypass valve for MAX AC to lock out the heater core for more effective AC.
 






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