Possible coolant leak?

necro24 · 05-29-2014, 10:52 PM

Last Friday I drove down from Tulsa, OK to Dallas, TX. On the way back, my engine overheating light came on in red. I had it towed to BMW and the next day they said the water pump failed and they had to replace it. On Monday this week, the coolant low warning came on so I thought they forgot to fill in coolant so I did so myself. On Thursday afternoon, the warning is back and the coolant is indeed low again. I just filled it up.

Does this sound like a leak to you guys? There's no funny smell and there is no weird smoke coming out of my exhaust when I rev the engine. I'm at a loss of what to do :/

Car: 06 BMW 325i.

Any advice welcome!

PINeely · 06-01-2014, 01:12 PM

Probably a pinhole leak in one of the hoses on the water pump/tstat. You won't notice any coolant pooling on the ground because it probably isn't actually leaking until the coolant is warm and the system is pressurized.

necro24 · 06-01-2014, 06:11 PM

Quote:

Originally Posted by PINeely

Probably a pinhole leak in one of the hoses on the water pump/tstat. You won't notice any coolant pooling on the ground because it probably isn't actually leaking until the coolant is warm and the system is pressurized.

Damn do you have an estimate on how much it'd cost to fix (not the DIY way)? I've searched and searched online and it's not giving me an answer.

Efthreeoh · 06-02-2014, 09:47 PM

Take it back to the dealer who replaced the pump and t-stat and tell them to fix it. There is probably a hose that is not seated correctly.

necro24 · 06-03-2014, 01:13 PM

Quote:

Originally Posted by Efthreeoh

Take it back to the dealer who replaced the pump and t-stat and tell them to fix it. There is probably a hose that is not seated correctly.

I would do that, but the dealer that replaced it is in Texas and I'm from Oklahoma :/ That's like 240 miles away.

macmaverickk · 06-09-2014, 10:46 PM

I had a coolant leak some time ago... I was told that my pump was bad too. They replaced the pump ($595), some "hose/coolant bypass" ($35), and the thermostat ($124). No issues since then with leaks... however, the vent hose that connects to the coolant reservoir housing (and runs along the front of the engine bay) snapped in half when I was working on my car recently. It was in horrible shape... it cracked way too easily. I replaced the hose ($125 from dealer) and all was well...

Efthreeoh · 06-10-2014, 05:20 AM

Quote:

Originally Posted by chasejennings

I had a coolant leak some time ago... I was told that my pump was bad too. They replaced the pump ($595), some "hose/coolant bypass" ($35), and the thermostat ($124). No issues since then with leaks... however, the vent hose that connects to the coolant reservoir housing (and runs along the front of the engine bay) snapped in half when I was working on my car recently. It was in horrible shape... it cracked way too easily. I replaced the hose ($125 from dealer) and all was well...

I didn't look on real OEM for the 335i, but that hose for the N52 is $30.

macmaverickk · 06-11-2014, 12:34 AM

Quote:

Originally Posted by Efthreeoh

I didn't look on real OEM for the 335i, but that hose for the N52 is $30.

Oops... I completely misspoke. That hose (P/N 17127565094) was $52 from the dealer. The $125 price was for a crankshaft sensor I replaced in my car recently

05-29-2014, 10:52 PM	#1
necro24 New Member 0 Rep 5 Posts Drives: 2006 BMW 325i Join Date: Mar 2014 Location: Tulsa iTrader: (0)	Possible coolant leak? Last Friday I drove down from Tulsa, OK to Dallas, TX. On the way back, my engine overheating light came on in red. I had it towed to BMW and the next day they said the water pump failed and they had to replace it. On Monday this week, the coolant low warning came on so I thought they forgot to fill in coolant so I did so myself. On Thursday afternoon, the warning is back and the coolant is indeed low again. I just filled it up. Does this sound like a leak to you guys? There's no funny smell and there is no weird smoke coming out of my exhaust when I rev the engine. I'm at a loss of what to do :/ Car: 06 BMW 325i. Any advice welcome!
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06-01-2014, 01:12 PM	#2
PINeely Lieutenant Colonel 1086 Rep 1,912 Posts Drives: 2013 535i, 2015 Tundra 1794 Join Date: Jul 2009 Location: Jackson, MS iTrader: (2)	Probably a pinhole leak in one of the hoses on the water pump/tstat. You won't notice any coolant pooling on the ground because it probably isn't actually leaking until the coolant is warm and the system is pressurized.
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06-02-2014, 09:47 PM	#4
Efthreeoh General 17309 Rep 18,733 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	Take it back to the dealer who replaced the pump and t-stat and tell them to fix it. There is probably a hose that is not seated correctly.
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06-09-2014, 10:46 PM	#6
macmaverickk Enlisted Member 19 Rep 33 Posts Drives: 2013 F30 335i Join Date: Jan 2011 Location: Texas iTrader: (0) Garage List 2019 BMW 540xi [0.00]	I had a coolant leak some time ago... I was told that my pump was bad too. They replaced the pump ($595), some "hose/coolant bypass" ($35), and the thermostat ($124). No issues since then with leaks... however, the vent hose that connects to the coolant reservoir housing (and runs along the front of the engine bay) snapped in half when I was working on my car recently. It was in horrible shape... it cracked way too easily. I replaced the hose ($125 from dealer) and all was well... __________________ Twin Turbo ~ Mineral Grey Metallic ~ Black Dakota Leather Premium Pkg ~ M-Sport Pkg ~ NBT Navigation ~ Adaptive Xenon ~ Comfort Access ~ Sirius/XM
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