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Discussion Starter · #1 ·
Heat turned up to high/max. Vent on driver's side door blows cool, vent on right of steering wheel blows warm, all other vents blow hot/seem like they are working as they should. Any ideas as to why? I did have a timing belt service done this fall. Ideas? Thanks
 

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Heat turned up to high/max. Vent on driver's side door blows cool, vent on right of steering wheel blows warm, all other vents blow hot/seem like they are working as they should. Any ideas as to why? I did have a timing belt service done this fall. Ideas? Thanks
Have you heard any clicking under the dash? The blend door actuator can go bad.
The other thing it can be is a plugged up heater core.
See post #6 with pics and video on a DIY fix.
 

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Once you have verified the drivers blend door is working correctly, then you need to flush the heater core. Needs to be a clr flush, don't waste your time with anything else.
 

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What seems odd to me is, at the CLR website it says “do not use in automotive radiator”. A heater core is a small radiator.🤷‍♂️
 

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Probably not good to add to coolant and leave in there for extended time. It is the Honda approved chemical for external pumping through the core.
 

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I can't imagine even thinking about leaving that stuff in for an extended period of time. With all the little nooks/crannies in a heater core, I find it hard to believe being able to 100% flush that stuff out. Maybe that's why CLR specifically says "do not use in". Wonder if Honda read the "do not use in" warning at the CLR website?🤷‍♂️

It's probably approved by Honda because they know it's possible that stuff can eventually eat a hole in the heater core and that will be some major cha-ching for a Honda dealership to replace the heater core.
 

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I hook a hose up to the core, and let it run 15 min in each direction as the last step of flushing. I have done lots of them, starting in 2014, so far no issues.
 

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CLR is an awsome product. It only eats away at rust and corrosion. It's diluted with water. So by a through rinse, you shouldn't have any fears of it continuing to eat away at your heater core.
 

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I'm not saying......CLR is saying. YMMV. 🤷‍♂️
 

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Discussion Starter · #10 ·
Have you heard any clicking under the dash? The blend door actuator can go bad.
The other thing it can be is a plugged up heater core.
See post #6 with pics and video on a DIY fix.
No clicks or unusual noises
 
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