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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > How to perform Coolant Service?



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      06-14-2012, 05:12 PM   #1
nhhiep
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How to perform Coolant Service?

My 06 325i at 71k miles.

My dealer quoted $165 to drain and refill (is it different from flush?) coolant. The coolant is only $25, so I am hoping to do it myself.

I searched and didn't find any detail steps/DIY guide for E90 N52 engine. Does anyone know?

Thanks
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      06-14-2012, 06:51 PM   #2
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Quote:
Originally Posted by nhhiep
My 06 325i at 71k miles.

My dealer quoted $165 to drain and refill (is it different from flush?) coolant. The coolant is only $25, so I am hoping to do it myself.

I searched and didn't find any detail steps/DIY guide for E90 N52 engine. Does anyone know?

Thanks
You are not searching hard enough. I believe member eninty has a very good DIY on the topic. Check DIY and maintenance sections
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      06-14-2012, 07:06 PM   #3
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E90 N52 Engine Coolant Change
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      06-15-2012, 03:41 PM   #4
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Thanks, you guys are quick. One more question.

Since I live on the surface of the sun (AZ), so I think the 50/50 rule is less optimal here. Should I do 60 water, 40 coolant or vice versa?

I plan to get coolant from Bavauto.com and the silver color gallon that they sell doesn't say it's already mixed or not. Anyone know? part # 82 14 1 467 704

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      06-15-2012, 05:03 PM   #5
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The BMW stuff is NOT premixed. You could definitely get away with 60/40 water/coolant if you don't plan on going to anywhere cold in the winter.

Make sure you mix with distilled water (can be found in the 1 gal jugs at the grocery store for cheap) and not tap water.
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      06-15-2012, 06:36 PM   #6
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Quote:
Originally Posted by nhhiep View Post
Thanks, you guys are quick. One more question.

Since I live on the surface of the sun (AZ), so I think the 50/50 rule is less optimal here. Should I do 60 water, 40 coolant or vice versa?

I plan to get coolant from Bavauto.com and the silver color gallon that they sell doesn't say it's already mixed or not. Anyone know? part # 82 14 1 467 704
You have to premix that stuff with distilled water. There is no vice versa, it's:
Tropical region 4:6 (coolant:water)
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      06-22-2012, 07:37 PM   #7
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did this today. super easy, except the car is so low. I didn't like the feeling under it. The most time consuming part is removing all the screws.
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      06-22-2012, 07:38 PM   #8
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Quote:
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did this today. super easy, except the car is so low. I didn't like the feeling under it. The most time consuming part is removing all the screws.
you mean the screws for the undercarriage protector?
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      06-24-2012, 07:05 PM   #9
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you mean the screws for the undercarriage protector?
yes, there are like 10 or so of item all over the place. the rest was super easy, just use a quarter to remove the radiator plug and bleed screw. I took out almost 2 gallons, even w/o lowering the car or remove any other hoses as listed in the DIY.

The original fluid is more like green. what I got from the dealer is light blue. After knowing how easy(and cheap) it was. I regretted for not doing it at 50k mark.
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      06-24-2012, 10:07 PM   #10
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Quote:
Originally Posted by nhhiep View Post
yes, there are like 10 or so of item all over the place. the rest was super easy, just use a quarter to remove the radiator plug and bleed screw. I took out almost 2 gallons, even w/o lowering the car or remove any other hoses as listed in the DIY.

The original fluid is more like green. what I got from the dealer is light blue. After knowing how easy(and cheap) it was. I regretted for not doing it at 50k mark.
OK, I have a cordless screwdriver that made removing the screws a breeze, but I can see how if you did it by hand it would take forever. I will definitely be doing this at 50k.
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