UPDATE* Failed Rad Cap Coolant Reservoir ... Failure? - Second Generation Nissan Xterra Forums (2005+)
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post #1 of 13 (permalink) Old 09-25-2017, 06:30 PM Thread Starter
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UPDATE* Failed Rad Cap Coolant Reservoir ... Failure?

So I was sitting in my car a few blocks from home with the AC running when I noticed the vents started pumping hot air out of nowhere. I turn off my truck and pop the hood only to find coolant pouring out of the bottom. First I thought it was the radiator I swapped in back in April. But, after closer inspection, looks to be coming from under my reservoir. I just checked the fluids yesterday and everything including the reservoir looked fine. Anybody ever seen this before. Never seen a failed reservoir on a vehicle .. doesn?t seem common with our Xterra either.

Is there something I'm missing?

Last edited by hammockking; 09-26-2017 at 07:58 PM.
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post #2 of 13 (permalink) Old 09-25-2017, 06:36 PM
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Verify it is not actually coming from nozzle cap area and dripping down towards bottom on side, etc.

If it is, be sure pressurized cap is on reservoir and non pressure on radiator and that its on tight and mot leaking pressure (fluid)...

The other thought is you are exceeding the pressure of the cap on the psuedo expansion tank (reservoir).

Plastics will fail over time, so it could be the seam at bottom, too...

just see if you can find exact spot it is coming from...best way would be while doing a pressure test.
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post #3 of 13 (permalink) Old 09-25-2017, 06:47 PM Thread Starter
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IMG_5649.JPG

Thanks for the fast response.

Copy that. Yeah, seems like itís coming from the bottom. I checked the top but itís hot as you might imagine so I didnít get to crank on it. Iím sure it could have evaporated but I didnít see anything on the side or on top. Only underneath on the sides and in front. Nothing towards the back of the reservoir. This is the only pic I have so far. Borrowed my girls car to run to OíReillys for some antifreeze.

Iím at a loss right now .. how much fluid do these reservoirs take again?

Worse time for this to happen .. may need to limp it to a trusted shop
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post #4 of 13 (permalink) Old 09-25-2017, 06:57 PM
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Why might a leaking reservoir cause the AC to run hot?
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post #5 of 13 (permalink) Old 09-25-2017, 07:24 PM Thread Starter
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Coolant Reservoir Failure

I was hoping you kind folks could help me pin point the answer to that.

Upon closer inspection at where @JNR suggested seems like I now have more antifreeze in the reservoir than the max line (though when I checked yesterday, it was fine) and the fluid indeed seems to have leaked out of that little spout at the top by the cap.

Iím at a complete loss what may be happening here
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post #6 of 13 (permalink) Old 09-25-2017, 07:29 PM
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Coolant coming out of the overflow and no a/c sure does sound like overheating. I'd bet that you have a cooling system issue if just started doing this out of the clearblue.

That being said, unless there is a crack in your reservoir and it was dumping on the belt and making it slip on the compressor. The reservoir is made out of plastic and see large temperature swings. Everyday it goes from 80-90F ambient to 200F. In the winter it will go from near freezing or so to 200F. Thiose are huge swings that will eventually make plastic deteriorate.

I've replaced reservoirs on my Infiniti and older Honda due to them becoming brittle.

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post #7 of 13 (permalink) Old 09-25-2017, 07:49 PM Thread Starter
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Quote:
Originally Posted by satown210 View Post
Coolant coming out of the overflow and no a/c sure does sound like overheating. I'd bet that you have a cooling system issue if just started doing this out of the clearblue.

That being said, unless there is a crack in your reservoir and it was dumping on the belt and making it slip on the compressor. The reservoir is made out of plastic and see large temperature swings. Everyday it goes from 80-90F ambient to 200F. In the winter it will go from near freezing or so to 200F. Thiose are huge swings that will eventually make plastic deteriorate.

I've replaced reservoirs on my Infiniti and older Honda due to them becoming brittle.


Yeah I hear you. But that little spout up top was wet so it definitely leaked out of there it seems.

I turned the key and it held the proper temp so I cranked it on turned on the ac .. all is working fine now it seems.

Why it started to overheat, overflow and lose AC is a mystery.

Please, any help is greatly appreciated.
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post #8 of 13 (permalink) Old 09-25-2017, 08:42 PM
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Check that the fans are working. The next suspect would be the water pump.
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post #9 of 13 (permalink) Old 09-25-2017, 10:10 PM Thread Starter
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Check that the fans are working. The next suspect would be the water pump.
the fans were definitely working. didnt get a chance to pursue the water pump.

i've got some big changes going on in life right now. unfortunately, i dont have the time nor clarity of mind to dedicate the time needed to fix this. took it to the shop i got my radiator at and will let them deal with it under the warranty.

will update the title and the thread once i have more info.

thanks to all who posted/will post
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post #10 of 13 (permalink) Old 09-25-2017, 10:23 PM Thread Starter
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this ridiculous post and @JNR have me wondering if my caps should be different.

they look absolutely identical (the one on the reservoir and the one on the radiator, i mean.

the only difference i noted was the the center point thats a release valve has an 11 on it on the cap that's on the reservoir. and the one on the radiator has some dried up coolant around the interior of the cap/base of the round center valve on top of the cap.

still dont get why that would have thrown my AC for a spin, though

best pic i could find of it
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Last edited by hammockking; 09-25-2017 at 10:32 PM.
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