Over fill coolant

mecheng77 · 07-19-2020, 10:57 AM

My friend wanted me to check over his newly purchased E90. I noticed the coolant reservoir was 2 cups over filled. I think they thought the float should be completely at the top when in reality the top line should be level with the reservoir

He asked if there were any ill affects from driving with it like this?

Efthreeoh · 07-19-2020, 01:04 PM

The lower ball on the reservoir float stick should be at the level of the top of the filler neck.

mecheng77 · 07-19-2020, 01:26 PM

Quote:

Originally Posted by Efthreeoh

The lower ball on the reservoir float stick should be at the level of the top of the filler neck.

Quote:

Originally Posted by Efthreeoh

The lower ball on the reservoir float stick should be at the level of the top of the filler neck.

Yes correct, I had to remove 2 cups of fluid to get it filled correctly. The seller didn't know that. Did it cause harm? Excess pressure on the reservoir maybe?

nsjames · 07-19-2020, 01:42 PM

it will cause increased pressure.
the air gap at the top of the reservoir is there to allow for the coolant expansion.
if it didn't pop a hose or the bottle it's fine.

Welcome to NBA Jam · 07-19-2020, 02:09 PM

You're fine if you've removed the excess.

mecheng77 · 07-19-2020, 05:07 PM

I'm assuming if the pressure gets too high would it bleed through the cap?

Efthreeoh · 07-19-2020, 05:08 PM

Quote:

Originally Posted by mecheng77

I'm assuming if the pressure gets too high would it bleed through the cap?

Yes. The cap is a pressure relief valve.

Welcome to NBA Jam · 07-19-2020, 05:20 PM

Quote:

Originally Posted by mecheng77

I'm assuming if the pressure gets too high would it bleed through the cap?

Yep. That's what it does.

07-19-2020, 10:57 AM	#1
mecheng77 Colonel 1007 Rep 2,244 Posts Drives: 2007 328i / 2014 M235i Join Date: Nov 2017 Location: Ontario Canada iTrader: (0) Garage List [0.00] [0.00]	Over fill coolant My friend wanted me to check over his newly purchased E90. I noticed the coolant reservoir was 2 cups over filled. I think they thought the float should be completely at the top when in reality the top line should be level with the reservoir He asked if there were any ill affects from driving with it like this?
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07-19-2020, 01:04 PM	#2
Efthreeoh General 17476 Rep 18,825 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	The lower ball on the reservoir float stick should be at the level of the top of the filler neck. __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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07-19-2020, 01:42 PM	#4
nsjames Brigadier General 2443 Rep 4,330 Posts Drives: 08 328xi Touring Join Date: May 2017 Location: ohio iTrader: (0)	it will cause increased pressure. the air gap at the top of the reservoir is there to allow for the coolant expansion. if it didn't pop a hose or the bottle it's fine.
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07-19-2020, 02:09 PM	#5
Welcome to NBA Jam Is it the shoes!? 3885 Rep 5,112 Posts Drives: (Sold) 2011 E92 335i ZMP 6MT Join Date: Mar 2014 Location: USA iTrader: (1)	You're fine if you've removed the excess.
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07-19-2020, 05:07 PM	#6
mecheng77 Colonel 1007 Rep 2,244 Posts Drives: 2007 328i / 2014 M235i Join Date: Nov 2017 Location: Ontario Canada iTrader: (0) Garage List [0.00] [0.00]	I'm assuming if the pressure gets too high would it bleed through the cap?
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