Coolant Leak Near Thermostat Housing - Drive Accord Honda Forums | radio-pro.ru
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post #1 of 32 Old 03-22-2016, 06:41 PM Thread Starter
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Coolant Leak Near Thermostat Housing

I am leaking coolant in this area and it is getting worse. I searched and this does not appear to be a common problem, or if it is, I can't find much on it.

Is it likely the thermostat housing o-ring? The hose appears to be in good shape. Does the thermostat housing crack occasionally?

The entire assembly rattles a bit at the connection but I suspect this is normal for the 'quick disconnect' design.

Amazon sells the genuine Honda assembly with thermostat and o-ring for like $60 or I can go Stant for like $40.


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post #2 of 32 Old 03-28-2016, 06:52 PM Thread Starter
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Thank you for all the wonderful suggestions.

I decided to buy the genuine Honda thermostat and housing assembly, but I got it via Honda's eStore website. Only $44.

So far, no leaks.


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post #3 of 32 Old 03-29-2016, 11:02 AM
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post #4 of 32 Old 03-29-2016, 11:48 AM
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what was the cause of the leak?

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post #5 of 32 Old 03-29-2016, 07:17 PM Thread Starter
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what was the cause of the leak?
It looks like it was leaking between the thermostat housing and that funky elbow piece with the clip on it. The elbow piece had a lot of crud and dried up coolant on it so I soaked it in vinegar for a few minutes and scrubbed it with a toothbrush.

That and/or the new thermostat & housing did the trick. Still no leaks.
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post #6 of 32 Old 03-29-2016, 07:19 PM Thread Starter
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BTW I also replaced my radiator which made it easier to get to the thermostat housing bolts. Denso radiator, free shipping, $77 on Amazon. Smokin' deal. Even had the little adapter for the coolant temperature sensor (which I did not need).

Here is the reason I replaced the radiator:
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Last edited by Gooch; 03-29-2016 at 07:21 PM. Reason: Added price and source for radiator
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post #7 of 32 Old 03-29-2016, 07:41 PM
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Whoa, NOW I know what you were talking about. I am sorry I could not help.

Good work on the replacement. I still don't understand what went wrong there. Can you shed any light on the coolant, how long you've owned the car, etc?

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post #8 of 32 Old 03-29-2016, 07:45 PM Thread Starter
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Whoa, NOW I know what you were talking about. I am sorry I could not help.

Good work on the replacement. I still don't understand what went wrong there. Can you shed any light on the coolant, how long you've owned the car, etc?
Had the car for 12 years.

Coolant? Using Zerex Asian. I think the leak started after I attempted to replace the lower hose (and failed because I couldn't access the clamp at the radiator end until yesterday, when I changed the radiator). Maybe I pulled on it too hard and messed up the quick-disconnect at that time.

I still don't understand that quick-disconnect fitting. Just seems like a problem waiting to happen. I guess it makes the thermostat housing swap easy though.

Just to clarify, the radiator wasn't leaking. The damage shown above made me want to change it because I knew it was just matter of time before the upper hose blew off.

The leak was at the quick-disconnect fitting.

One more tidbit...in my post-repair check I found out that the driver's side cooling fan is not working. It's getting 12 volts when the A/C is on, so it appears to be shot.

Amazon sells an aftermarket housing/shroud with both fans for like $82 so I will probably do that. Too bad I didn't already have it as I could have just slipped it in after the radiator replacement for no extra work.


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post #9 of 32 Old 03-30-2016, 04:55 AM
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Quote:
Originally Posted by Gooch View Post
Amazon sells an aftermarket housing/shroud with both fans for like $82 so I will probably do that. Too bad I didn't already have it as I could have just slipped it in after the radiator replacement for no extra work.

Glad you got the coolant leak figured out.

Just a question, are you shopping around for parts online, or just going through Amazon for everything? I find that Amazon has outrageous prices on stuff in general, about 75% of the time. I usually buy used parts on eBay (or go to the salvage yard), sometimes I get new parts on there too, if it's not something too complicated. Just wondering


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post #10 of 32 Old 03-30-2016, 06:42 AM
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Quote:
Originally Posted by Gooch View Post
Here is the reason I replaced the radiator:


What kind of hose clamp did you have on it? I ask, because if it was a worm clamp, it would not expand for the heat expansions that plastic goes through. The plastic would eventually crack up like in the pic. When plastic is involved, only a spring clamp should be used. Worm clamps are okay for metal. Many a radiator is ruined by people not knowing this.

Worm and spring clamps
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post #11 of 32 Old 03-30-2016, 07:07 AM
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Holy Knowledge, Batman!

Drew: I never even thought of that. Makes sense. Thank you!
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The main issue is the force on the worm clamp is focused right at the gear putting stress on the plastic. Never use a worm clamp on a plastic radiator.

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post #13 of 32 Old 03-30-2016, 07:09 AM
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I've heard when installing a new muffler or section of pipe (if it's not completely welded together) you should clamp it, drive until it gets hot, then re-adjust the clamps to compensate for the heat expansion. Similar idea, since I don't think they make spring clamps big enough for exhaust piping, lol.


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post #14 of 32 Old 03-30-2016, 07:32 AM Thread Starter
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Quote:
Originally Posted by Drew03Accord View Post


What kind of hose clamp did you have on it? I ask, because if it was a worm clamp, it would not expand for the heat expansions that plastic goes through. The plastic would eventually crack up like in the pic. When plastic is involved, only a spring clamp should be used. Worm clamps are okay for metal. Many a radiator is ruined by people not knowing this.
I am using the factory spring clamps. They are a pain to work with, but I like them better because they can't back off and loosen like the worm type and you can't over-tighten them.

I never thought about the expansion, but that makes perfect sense. Yet another reason to stick with the spring type. I just wish I had a better tool to remove and install them. The ones on the transmission lines were a real pain because my pliers weren't wide enough to pick up all three ears. I just ordered 90° bend needle nose pliers which hopefully will work better.

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post #15 of 32 Old 03-30-2016, 07:35 AM Thread Starter
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Originally Posted by enne View Post
Glad you got the coolant leak figured out.

Just a question, are you shopping around for parts online, or just going through Amazon for everything? I find that Amazon has outrageous prices on stuff in general, about 75% of the time. I usually buy used parts on eBay (or go to the salvage yard), sometimes I get new parts on there too, if it's not something too complicated. Just wondering
While I don't buy everything on Amazon, I admit that it is the first place I check. They didn't have the best deal on the genuine Honda thermostat and housing assembly, but is there a better deal than $77 for a Denso radiator with free shipping?


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