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#1
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Coolant leak - looks like lower radiator hose
The only reason I'm posting this is that I don't see any obvious cause of the leak - the hose doesn't appear to be split, and there are no visible cracks at the connector to the radiator. But there's no wetness anywhere higher up on the rad hose, or anywhere else for that matter - it all seems to be coming from where the lower rad hose meets the radiator. So, I need to order a new hose, but before I do, is there something else I should look for, or order, that could cause or contribute to the leak? Thanks.
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2003 X5 4.4i 1992 Porsche 968 2007 328i 2014 Subaru Forester XT |
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#2
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Yeah a crack expansion tank or the radiator itself.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#3
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Could it be the coolant level sensor? The o-ring will get old and hard over time.
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Kirk Las Vegas 2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo 2011 E90M3, 6-speed manual |
#4
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Not sure about the V8's but the 6 cyl ones have a coolant temperature sender at the lower part of the lower rad hose that can leak.
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04 X5 3.0i auto 03 X5 4.6is |
#5
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Thanks; I can't see any hint of wetness anywhere on the radiator, and while there is a bit of "crustiness" on various parts of the expansion tank (so I should go ahead and replace it as well), again there's no sign of fresh liquid, plus the lines coming from the tank don't lead to the area where the coolant is dripping. It looks like the leak is coming from the top of the hose; maybe there's a crack where the sensor's connector is located.
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2003 X5 4.4i 1992 Porsche 968 2007 328i 2014 Subaru Forester XT |
#6
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Isn't the coolant level sensor at the bottom of the expansion tank? There's no sign of fresh leakage there - it's all right at the bottom of the lower radiator hose, where it connects to the radiator, but the leak seems to be originating from the hose itself about an inch away from the radiator.
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2003 X5 4.4i 1992 Porsche 968 2007 328i 2014 Subaru Forester XT |
#7
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Now that's a real possibility, as it's in the right area. Maybe I should start by replacing the o-ring, and then going from there.
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2003 X5 4.4i 1992 Porsche 968 2007 328i 2014 Subaru Forester XT |
#8
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^probably means coolant TEMPERATURE sensor, as the coolant level sensor is not immersed in water. Althoug theoretically water could come out there if the expansion tank had an internal failure...never heard of that ever though.
Yes the o-ring can cause a leak in that area, I have experienced it and a new o-ring fixed it. Do check your expansion tank as well. These tanks have seams and they can leak from there. I've had this happen to me as well. Since many of these leaks only occur at full operating temp they may be hard to find at idle. Best bet is to clean up the area so they show up easier and check while hot like after a freeway run.
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04 X5 3.0i auto 03 X5 4.6is |
#9
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Turns out the coolant temp sensor o-ring was the sole cause of my leak. Once I replaced it, the leak completely stopped. Thanks to the people who pointed this out to me, as replacing the hose wouldn't have done any good.
Unfortunately, while I was under the car working on this, I discovered something more ominous: the valve cover gaskets, which I replaced in December of 2010, are leaking again. AAARRRGGGHH!!! Other that the CV boot replacement, that was the most frustrating job I've ever done on this, or maybe any other, car. There has to be an easier way than the nightmare I went through pulling off those wretched fuel injector retaining clips that I went through last time...
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2003 X5 4.4i 1992 Porsche 968 2007 328i 2014 Subaru Forester XT Last edited by Multibeemer; 02-08-2014 at 04:37 PM. |
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