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DIY: Heater Core Flush with Filter Installed

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Old 11-18-2019, 04:53 AM
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Default DIY: Heater Core Flush with Filter Installed

I know this topic has probably been beat to death here but I wanted to show people how easy it is to perform yourself and how to install an affordable filter screen.

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Old 11-21-2019, 06:35 AM
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Good video, Is your heater working again after doing this?

Mine had the same amount of debris when I flushed it, but still didn't alleviate the heater issue (on driver side). What did help immensely was switching the inlet/outlet heater hoses at those same clamps....Now, I have heat again.
Old 11-21-2019, 06:41 AM
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Yes heat (hot) returned but I think I have a blend door issue. Sounds like you just back flushed yours by switching the lines.
Old 11-21-2019, 06:46 AM
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I flushed mine by running water through the outlet for 15min, added 4oz of CLR to inlet, flushed outlet again for 15min.... Then, I switched the lines after that didn't work.
Old 11-21-2019, 06:50 AM
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Water flows great through the heater core now, just getting intermittent heat on driver side.
Old 11-21-2019, 05:39 PM
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Would be good to add a step after flushing to blow out the lines. You can get a cheap hose inlet fitting for RV winterizing that you can connect a compressor to. That way zero tap water is left in the system🤞
Old 12-09-2019, 05:04 AM
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Originally Posted by Bora Boy
Would be good to add a step after flushing to blow out the lines. You can get a cheap hose inlet fitting for RV winterizing that you can connect a compressor to. That way zero tap water is left in the system🤞
I got a ton of water out of it just by blowing it through with my mouth, but yes getting that tap water out is a must.
Old 12-09-2019, 05:04 AM
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Update: Here's a video of me flushing the filter system I installed on the heater core inlet side.

Old 01-18-2021, 02:57 PM
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Originally Posted by Dirt Hammer
I know this topic has probably been beat to death here but I wanted to show people how easy it is to perform yourself and how to install an affordable filter screen.
@Dirt Hammer If you are still here. Just wondering how this worked out and if you are still using it?



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