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#1
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Coolant connection fitting question
I replaced the expansion tank last year and it included the oring that 'snapped' onto the fitting, so I'm not really sure why it started leaking here. It feels like it is no longer snapped into place and can be easily moved in and out of the bottom of the tank opening and won't snap back into a locked position. Do you think this fitting can be replaced without removing the expansion tank?
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'05 X5 3.0 '06 325i '90 E30/S52 Last edited by RenaissanceMan; 01-12-2025 at 06:22 PM. |
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#2
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No pic. Which motor?
The bottom of reservoir on m54 is the thermostat for the transmission cooler. That part usually self destructs on removal so should have been replaced with the reservoir. You can get just that thermostat and replace just it if that will replace the wonky connection.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#3
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Quote:
Thermostat was changed when the reservoir was changed, as removing it destroyed the old one, as you mentioned.
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'05 X5 3.0 '06 325i '90 E30/S52 Last edited by RenaissanceMan; 01-12-2025 at 06:16 PM. |
#4
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If you can't get it to snap back in...I don't think you have a choice but to pull it and the expansion tank out and apart and see why it's leaking.
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'03 530i - manual swapped - 425k miles '06 325Cic auto 115k '05 X5 3.0 auto 158k '99 E39 528i 5-speed 130k |
#5
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A new o-ring may seal it. I keep a spare fitting in my back up parts box. My coolant leak was the lower oil cooler seal. The cooler would teeter due to vibration. Once I secured the transmission lines from moving too much, the leak stopped. Try securing the hose line a bit to limit movement. Or did it crack?
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
#6
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Did you get the tank all the way on?
I used aftermarket part and it took my entire body weight to get the thing to seat. If all you need to do is re-seat you can pull it up a bit and have a new go at it. You will just spill a couple oz. of coolant. You could use a ratchet strap to help pull it down. Do you recall if the retention spring clicked?
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#7
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'05 X5 3.0 '06 325i '90 E30/S52 |
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'05 X5 3.0 '06 325i '90 E30/S52 |
#9
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Just following up here. Took everything apart and all parts were intact. Leak was coming from the somewhat loose connection where the hose connection fitting (#3 in the diagram) connects to the bottom of the expansion tank. I replaced the o-ring inside the tank where that part snaps in and now that connection is way more secure. Pressure test was successful and I've been driving it around without any leaking. Happy I didn't need to purchase any parts this time around.
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'05 X5 3.0 '06 325i '90 E30/S52 |
#10
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Quote:
![]() Good job,although I have that mine seems to do things just to screw me over so I'd be careful saying you didn't need to buy parts anywhere where your e53 can hear it... ![]() Sent from Embassy network using Tapatalk
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course |
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