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cabin heater control valve on 2.5th Gen

Discussion in '2.5 Gen Tundras (2014-2021)' started by KirthGersen, Aug 15, 2025.

  1. Aug 15, 2025 at 4:08 PM
    #1
    KirthGersen

    #1
    KirthGersen [OP] New Member

    Joined:
    Jun 16, 2018
    Member:
    #16212
    Messages:
    78
    Gender:
    Male
    So Calif
    Vehicle:
    2018 SR5 Crewmax
    If the cabin heater control valve is "maximum" open (max temperature setting) when the truck is running, does the valve remain open when ignition is "off"? 2.5th Gen, 5.7L gas engine, model year 2015, manual HVAC.

    Reason I ask is, I'm planning to do a complete coolant drain & refill of radiator, engine block, and as much as possible, the heater core.

    If the control valve shuts off when ignition is off, I might have to use a "battery maintainer/ smart charger" to force valve open during the coolant maintenance. I realize the amount of coolant in heater core is small, but I am OCD about such things ;-)

    TIA
     
    KirthGersen, Aug 15, 2025
    #1
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