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1990 XJ Heater Flush

   
Old Feb 5, 2022 | 12:30 PM
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From: S.E. KY
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0l
Default 1990 XJ Heater Flush
Hi all, I have no heat, heater control valve was removed by previous owner. I'm wondering if flushing the heater core (no leaks) will have any effect? Thanks.
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Old Feb 5, 2022 | 01:02 PM
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Are both heater hoses hot?
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Old Feb 5, 2022 | 06:51 PM
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Year: 1990
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Haven't checked...Will do tomorrow. Thanks
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Old Feb 5, 2022 | 08:58 PM
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Flushing back and forth can't hurt. Mine went from minimal heat to lots of heat. It gushed brown crap for several iterations of flushing back and forth before it ran clean.
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Old Feb 6, 2022 | 10:48 PM
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Both lines are hot.
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Old Feb 7, 2022 | 09:23 AM
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Since both hoses are hot, next suspect is the blend door. It's cable operated. Look under your glove compartment.
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