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Back Flushing 99 Ranger Heater Core

How do I back flush a heater core for 99 Ford Ranger? Can I do damage, if I do it wrong?

By Mike H. from Boston, MA

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October 26, 20141 found this helpful

What I normally do is buy two flush kits that you can normally get at walmart or you auto parts store. I hook the "T" connector to both hoses going to the heater core in the engine compartment. I personally try to hook my Jose up to a hot water source, I also like to pour coolant flush into the core prior to flushing to help break up any gunk.

Also you want to punch off the hose on opposite side of "T" connector to force the water towards the heater core and not the toward the engine as this can mess up the thermostat and make sure that the second hose coming from core can dump into a container and is not attached towards motor or the gunk that will break free can go into motor and cause damage.

I've done this a hundred times and have saved tons of money from having to replace heater core. Total cost with new antifreeze and two flush kits should be around $30 rather than $400 for new heater core and $1500 for labor. It's definitely worth doing. You can also find videos YouTube and other sources (some prefer to use compressed air rather than water).

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The only time you really need to replace heater core, is if it is leaking which in this case, your passenger side floor will most likely be wet).

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