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Who needs a heater valve?

Discussion in 'Stock 1995 - 2001 Explorers' started by 1998Exp, October 10, 2019.

^^Searches ExplorerForum.com^^

  1. 1998Exp

    1998Exp Well-Known Member

    December 5, 2010
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    City, State:
    Seattle WA
    Year, Model & Trim Level:
    98 Limited V8 AWD
    You know, that all-plastic, failure-prone gizmo at the connection to the heater core behind the firewall. As it recently broke, relieving my Ex of all coolant in a jiffy and I am waiting for kind people to tell me which way to install the replacement (see my previous post on the subject), I have been contemplating the need for this thing. It closes in MAX AC or OFF to block the coolant flow to the heater core, but doesn't the blend door perform a similar function anyway? A point of reference: my 04 Crown Vic, with a virtually identical HVAC system doesn't have a heater valve.
    Last edited: October 10, 2019
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  3. BKennedy

    BKennedy Elite Loser Staff Member Moderator Elite Explorer

    November 29, 2000
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    City, State:
    San Diego, PRofK
    Year, Model & Trim Level:
    1994 XLT
    The valve keeps coolant out of the passenger compartment when the heater is not being used. Without it, you can feel the heat radiating through the HVAC by the passenger's feet. You can bypass it and see how you like or don't like it with 2 pieces of 1/2" OD tubing, hose clamps, and a plug for the vacuum line. I carry 2, 3" pieces of tube in my Explorer in case the plastic valve (or heater core) falls apart. It fell apart on me before, luckily in the garage.

    You install it just like the old one came off. There are arrows on the valve showing you the direction of flow. Some of the aftermarket valves don't line up right because the flow direction of wrong.

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