2004 Jeep Wrangler heater core bypass?

My heater core has recently started leaking and I am planning to bypass it until I have the time to fix it. I was just wondering if I had to drain anything from the hoses first before I unplug them to bypass the heater core?

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  • 8 months ago

    You do not need to drain, but you can then expect coolant to leak until you connect the two. If you do drain the radiator, they will only drip/leak minimally.

  • 8 months ago

    You have to create a loop for the coolant so it goes back into the engine. You can drain the radiator first. Reuse the old coolant if it it still less than five years old. Buy a metal tube or elbow type pipe and hose clamps if needed. Connect the incoming and outgoing hoses with the tube or pipe and clamps.

  • 8 months ago

    There are special heater hose clamps that are a tool and you should use those to clamp the hoses before you remove the core. This will prevent the loss of coolant. Check an auto parts store.

  • Anonymous
    8 months ago

    Disconnect the hoses, close one end and try to suck all the coolant out of the heater core with a wet-vac or by pushing with compressed air.  That is all you need to do.  Make sure to top off the coolant and do a leak check after installing the bypass.

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  • Anonymous
    8 months ago

    No don't drain them as you will just end up with excessive air in the system. In fact if you can clamp near the ends with mole grips it will save spilling coolant. 

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