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Thread: Heater Hose Valve 2003 7.3L

  1. #1
    SoCAPS Member
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    10/09/2004
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    Heater Hose Valve 2003 7.3L

    2003 7.3l. On the heater hoses near the fire wall there is a valve inline with what looks like a vacuum line attached. I posted on another post about radiator fluid coming out the back of the engine on the passanger side of the bell housing. Turns out this valve has a bunch of air ports underneath and it looks like when I shut it down or start it the sudden surge in pressure causes the thing to puck some radiator fluid out of the bottom of this thing. What is it and why is it doing this?

  2. #2
    SoCAPS Sponsor
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    11/17/2009
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    Heater control valve it shut off when the ac is on so no hot coolant flows to the heater core even thow air is directed around the heater core with the ac on the heater core still omits heat!! Normally leak out the shaft for the control valve!!

  3. #3
    SoCAPS Member PatriotHaulingServices's Avatar
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    07/31/2011
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    Ventura
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    33
    Its known as the "MAX A/C" or "Ranger Valve" mod. Some trucks came with them stock though. The heater core always has coolant running through it unless the valve is in place. If the valve is in place, it will shut off coolant flow when the knob is switched to MAX A/C.
    EMT - 2002 F250 XLT CrewCab Short Bed 4x4 7.3L
    Responded to the scene of 89 yo female with left femur fx, upon arrival pt. was found in bed with first responder.

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