Drain coolant when changing thermostat housing?
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  • 1 Post By plano-doug

Thread: Drain coolant when changing thermostat housing?

  1. #1
    Driver's Ed
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    Drain coolant when changing thermostat housing?

    Is it necessary to drain the coolant before replacing the thermostat housing? Will it dump a lot of coolant if I don't?

    Have a 2015 with the 1.4l turbo and a check engine code for P0599 "Thermostat Heater Control Circuit High". No other symptoms or leaks evident.

    Thanks for your help.

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  3. #2
    Drag Racing Champion
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    ANY time ANY work is performed on the cooling system. Coolant MUST be drained.

    Unless you want to clean up a mess with possible fire crew being called on you.

    Yep. Had that happen. Over floor soap. Which, when mixed with water. Turned to the color of green antifreeze. Other colors didn't exist back then.

  4. #3
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    Quote Originally Posted by DestinationCalculating View Post
    Is it necessary to drain the coolant before replacing the thermostat housing? Will it dump a lot of coolant if I don't?

    Have a 2015 with the 1.4l turbo and a check engine code for P0599 "Thermostat Heater Control Circuit High". No other symptoms or leaks evident.

    Thanks for your help.
    You don't necessarily need to empty the system. But you want to drain enough that, once you start removing parts, you don't have coolant going everywhere.

    Doug

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  6. #4
    Handbrake Released Thebigzeus's Avatar
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    I did mine a month ago, you don't need to drain anything. I put an oil pan underneath and it drained out probably 3/4 of a gallon. Bought a gallon jug to refill and that was enough. Rinse the engine off afterwards and good to go.

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