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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-12-2012, 01:19 PM   #1
Mango
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Why you should change your coolant every two years (at least) photos inside.

This is from my friend's 95 M3 from two days ago. I replaced some parts such as the pulleys, belts, water pump, thermostat, housing, and bled the system. Radiator had a 2008 date stamp so the owner decided to skip that for now. We also did a full coolant flush using Genuine BMW coolant and distilled water. The car was previously serviced using tap water and Prestone combination.

The car is by no means neglected or abused other than using tap water for the cooling system prior to my friend's ownership. Anyway pictures speak for themselves.

We flushed the block, radiator, and expansion tank out with a garden hose then forced any remaining water out with a wetvac in the reverse (blow) setting. You can't imagine all the rust/brown colored water that was forced out (especially out of the radiator) After five cycles of flushing each component, the water came out clear.

The radiator was basically choking. I also did a bleed video of this car and I'll post that soon. And I added a bonus picture of the car I took the same day.

Besides the obvious corrosion and clogging/overheating risk, coolant/water should be replaced at least every two years to prevent electrolysis as well. I'll be doing mine next weekend. I already got a brand new jug of blue waiting for me on my dinner table.





Bonus picture of the car that has 220,000 miles on it.

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Old 11-12-2012, 01:44 PM   #2
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Good advice. While you might not notice ill affects immediately, they will start to accumulate fast until you have a major problem. It's best to keep your fluids fresh to avoid unnecessary problems.
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Old 11-12-2012, 02:05 PM   #3
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Lol... Dinner table.




Funny cause true.
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Old 11-12-2012, 02:22 PM   #4
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Don't forget the blessing over the coolant in your shrine.

Five rinses until it was clean? Man! I think I'll try this wet vac blowing method like you did. I'm glad you learned that your vac also works on cars...I was beginning to worry about you!
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Old 11-12-2012, 02:29 PM   #5
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Originally Posted by dmax View Post
Don't forget the blessing over the coolant in your shrine.

Five rinses until it was clean? Man! I think I'll try this wet vac blowing method like you did. I'm glad you learned that your vac also works on cars...I was beginning to worry about you!
Yeah it was pretty good method for blowing all the water out. LOTS of water came gushing out as we reversed the vacuum hose (blow) on it. This forces water out of all of the jackets and hoses. I'd probably make sure every orifice is opened up on the engine so you don't overpressurize anything. open expansion tank, t-stat, water pump, etc.
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Old 11-12-2012, 02:41 PM   #6
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Originally Posted by E46Mango View Post
This is from my friend's 95 M3 from two days ago. I replaced some parts such as the pulleys, belts, water pump, thermostat, housing, and bled the system. Radiator had a 2008 date stamp so the owner decided to skip that for now. We also did a full coolant flush using Genuine BMW coolant and distilled water. The car was previously serviced using tap water and Prestone combination.

Tap water????!!!! Really??!!!
Prestone? Was it the right one for the car ?
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Old 11-12-2012, 02:49 PM   #7
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Ok this is gonna freak the shites out of you guys but my car is running about 75% water from tap how ever I do flushes every year at the most though
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Old 11-12-2012, 03:56 PM   #8
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Ok this is gonna freak the shites out of you guys but my car is running about 75% water from tap how ever I do flushes every year at the most though
What's so hard about $2 for a gallon of distilled water and $20 for a gallon of BMW coolant every 2 years? Tap water, regardless of being changed often, will leave mineral deposits everywhere.
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Old 11-12-2012, 03:58 PM   #9
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Because I grew up in the streets dawg :lol:
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