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Trying to identify coolant Leak

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Old Oct 3, 2022
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Trying to identify coolant Leak

Hello, I've been chasing a coolant leak for awhile. Seems to be worse on the driver side. I don't know **** about cars so I'm sorry if this isn't enough info.

It's a 2010 Honda Civic LX Coupe

Any ideas? I feel like it's the radiator.

Checked the oil and it's clear. Also nothing white and thick or evident coming out of exhaust.


Under the battery is where the worst of it is





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Old Oct 3, 2022
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Re: Trying to identify coolant Leak

I can also see coolant at the very bottom of radiator fins and on the right side fan.
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Old Oct 3, 2022
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Re: Trying to identify coolant Leak

Could be the rad, can't remember if the 2010s had the block cracking issue
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Old Oct 3, 2022
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Re: Trying to identify coolant Leak

I've scoured through tons of forums and it appears to be up until 2009 models. I guess I just need to get a pressure test
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Old Oct 3, 2022
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Re: Trying to identify coolant Leak

cracked block is in the back side of engine, between firewall and engine
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Old Oct 3, 2022
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Re: Trying to identify coolant Leak

Originally Posted by sdaidoji
cracked block is in the back side of engine, between firewall and engine
can I ask what makes you think that is it? Why is there a bunch of coolant in the radiator then?

thanks for the reply
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Old Oct 3, 2022
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Re: Trying to identify coolant Leak

why do you think you have a cracked block instead of something different?
now, correction on my part: it is in the front side.

https://www.civicforums.com/forums/3...locations.html
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Old Oct 3, 2022
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Re: Trying to identify coolant Leak

I’m sorry, I thought you were stating that my problem is a cracked engine block. I think I misread what you were saying
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Old Oct 3, 2022
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Re: Trying to identify coolant Leak

Originally Posted by sdaidoji
why do you think you have a cracked block instead of something different?
now, correction on my part: it is in the front side.

https://www.civicforums.com/forums/3...locations.html
I’m sorry, I thought you were stating that my problem is a cracked engine block. I think I misread what you were saying
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Old Oct 4, 2022
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Re: Trying to identify coolant Leak

Are you able to figure anything out from underneath? Why the aftermarket rad cap? Is it the cause of the leak? Check the small hose going to the reservoir, it could have a slow leak as well.
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Old Oct 4, 2022
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Re: Trying to identify coolant Leak

Originally Posted by BrotatoChip
Are you able to figure anything out from underneath? Why the aftermarket rad cap? Is it the cause of the leak? Check the small hose going to the reservoir, it could have a slow leak as well.

I just bought it to replace the old radiator cap, just to rule out that being the problem. That was the only one they had available.

I got underneath and I’m having a hard time finding the leak
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Old Oct 4, 2022
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Re: Trying to identify coolant Leak

Fan shroud will be blocking it if it's the rad that's leaking. Or the plastic splash shield.
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Old Oct 8, 2022
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Re: Trying to identify coolant Leak

OKay, so I rented a pressure tester from O'Reillys and still cannot find a damn leak. The PSI went down super slow over 20-30 min and then stayed put around 15 PSI.

I'm scratchin my head here.
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Old Oct 9, 2022
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Re: Trying to identify coolant Leak

Originally Posted by Caltron3030
OKay, so I rented a pressure tester from O'Reillys and still cannot find a damn leak. The PSI went down super slow over 20-30 min and then stayed put around 15 PSI.

I'm scratchin my head here.
Looked here yet?

Originally Posted by Colin42
Fan shroud will be blocking it if it's the rad that's leaking. Or the plastic splash shield.
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Old Oct 9, 2022
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Re: Trying to identify coolant Leak

Originally Posted by Colin42
Looked here yet?

????
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