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Old 05-23-2013, 06:52 AM   #1
sihyonkim
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Should I do the cooling system maintenance?

Hi all,

My 325i is at nearly 135,000kms. I don't have any issues with coolant leaks etc, but should I do the cooling system overhaul soon (minus the radiator)? If I do, I am thinking of changing the belts/pulleys as well.....

Would like to get the parts from clickable, but they ran out of stock for water pump. Any other places where I could get the water pump locally, other than dealers?

Thanks!
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Old 05-23-2013, 06:54 AM   #2
Dreamliner330
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I did, but I wouldn't do it again. I no longer believe in excessive preventative maintenance. Wait for signs of imminent failure and replace then.

Last edited by Dreamliner330; 05-23-2013 at 06:54 AM.
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Old 05-23-2013, 07:30 AM   #3
Jall
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I'd be checking your belts and pulleys for wear first on that list.
RE. cooling system, as above, you can get excessive with preventative maintenance.
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Old 05-23-2013, 02:39 PM   #4
Brissyjohn
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Agree with the above. Just keep checking for any signs of leaks and check the belt for deterioration/cracking. Also listen for squeaking or other strange noises (pulleys/tensioners/water pump) while the engine is running. Mine has done 155,000 and all seems good so far in the cooling department. I check around my engine bay every time the car is washed - about every two weeks or so.
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Old 05-23-2013, 06:48 PM   #5
trive2
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I've overheated and seen overheated enough BMW's to believe in proper preventative maintenance. You can run your Hilux in the red a thousand times without a worry, but you overheat your BMW and your engine turns to pudding in a heartbeat. No thank you.

I personally believe in preventative maintenance over the entire car, but if you don't I can understand that. However, when it comes to the cooling system, don't be skimpy.

New cooling system = $300.
New engine = $2000+ and time off road
Your choice.

E.g. I recently re-did my cooling system at 8yrs and 160,000km. I noticed I'd already had a new water pump and thermostat prior to me. However, my upper hose was split and my lower hose was brittle, plus my transmission thermostat was trashed. It was well due and could have been prevented if the previous idiots had replaced everything like they should have while they had it apart.
The only thing I didn't replace was my radiator, and now the upper neck is leaking, so I have to pull it down again.

____________________________________________________________ ________________________________________________


Also, check out Mango's cooling list on the general forums. It's missing a few parts (you'll have to search around realoem.com to find them, and I'd also suggest heater hoses if you want to be super anal) but almost entirely comprehensive.

I would just get my parts from Pelican or BMA (my choice). Better range and cheaper in bulk.
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Old 05-23-2013, 07:04 PM   #6
rcsummers
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Do it, and do it right the first time. Replace everything that could possibly fail.
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Old 05-23-2013, 07:17 PM   #7
trive2
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Parts are so cheap, whether its your time or time you're paying for, it's easier and cheaper just to do it all at once. The reason cars like this have a reputation for being unreliable is because cheap people replace things one at a time instead of being comprehensive and it bites them repeatedly and expensively.
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Old 05-23-2013, 07:59 PM   #8
Gee Emm
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Quote:
Originally Posted by trive2 View Post
plus my transmission thermostat was trashed.
my auto thermostat was also phucked.
I baulked at the ~$95 extra when I bought the other parts.
Rumour has it that nearly all are, so pay the extra while you have the expansion tank etc apart.

I have replaced all hoses & all cooling bits, except radiator.

But, I did wait until one item needed attention eg thermostat housing & pump housing weeping.

Just do it!

Graham
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Old 05-24-2013, 03:13 AM   #9
trive2
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Originally Posted by Gee Emm View Post
my auto thermostat was also phucked.
I baulked at the ~$95 extra when I bought the other parts.
Rumour has it that nearly all are, so pay the extra while you have the expansion tank etc apart.

I have replaced all hoses & all cooling bits, except radiator.

But, I did wait until one item needed attention eg thermostat housing & pump housing weeping.

Just do it!

Graham
My transmission thermostat combined with some sort of phenomenon (we suspect the change from blue to green coolant was part of it) to completely clog up the transmission cooler with some sort of near solid jelly.

It nearly destroyed my gearbox and no one could figure out why. After running for a while, irrelevant to driving style, it'd start slamming gears. Once it went into limp mode.

I had a full fluid flush at 150,000km and the guy said he had to use 20L of fluid to get it clean, he'd only quoted me 12L (and didn't charge me extra!). Said it was blacker than diesel oil.
Figured it out when I did my cooling system about 5,000km later and found the slush.

No one could tell me why, not even the gearbox shop. Turns out it was overheating.
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Old 05-24-2013, 04:24 PM   #10
asdetail
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Quote:
Originally Posted by Brissyjohn View Post
Agree with the above. Just keep checking for any signs of leaks and check the belt for deterioration/cracking. Also listen for squeaking or other strange noises (pulleys/tensioners/water pump) while the engine is running. Mine has done 155,000 and all seems good so far in the cooling department. I check around my engine bay every time the car is washed - about every two weeks or so.
+1,very good advice,my 325 has done 143k and I generally scrutinise the underbonnet every couple of weeks for strange noises and coolant and oil leaks,sofar my vigilance has lead me to replace the radiator,serpentine belt, and idler pulleys,why get anal and start fixing things that aint broke?(leave that to our government!).
Having owned and repaired a multitude of different vehicles over the last 30 years this routine has served me well.
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Old 05-25-2013, 03:28 AM   #11
spacemaster
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I did mine at the same Kms as your, few months ago. I will not to worry about it for another 100k, which is another 5 years. I am glad I did. Sometime thermostat and water pump does not show wear before it fails.

If you can do it. Go ahead. You will understand more about your car..... That is another benefits.

Last edited by spacemaster; 05-25-2013 at 03:29 AM.
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Old 05-25-2013, 05:00 AM   #12
sihyonkim
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Thanks for all the advice. When I read one side I lean towards it and then read another side....I cant make up my mind!! I think I will ask my mechanic for his opinion as well
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Old 05-25-2013, 06:21 AM   #13
Leezy321
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Should I do the cooling system maintenance?

As a former mechanic and BMW tech, I'd say wait until something fails or looks suspect... Maybe get a coolant system flush if you want to do something. I live by "if it ain't broke don't fix it" on my cars... That's just my opinion though and everyone has there own.


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Old 05-25-2013, 06:36 AM   #14
awesomechinz
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Should I do the cooling system maintenance?

In b4 mango...
On another note, I would do the cooling system so you don't get screwed while driving down the road to somewhere important
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Old 05-25-2013, 10:30 PM   #15
TurnersInOz
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If there is a reason to work on it, replace it all.
If there are no issues, leave it alone.
If you want the peace of mind that comes with a shiny new cooling system, do it. But do it all in one go.
You'll never get a solid consensus on this topic, it really comes down to what you are comfortable with.
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Old 05-25-2013, 10:46 PM   #16
BMWCaptain
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In b4 mango too!

I do preventative maintenance because it is $200-$300 and is a lot cheaper than breaking doen in a different state and paying all the inconvenient costs.
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Old 05-26-2013, 03:45 AM   #17
TonyJ
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I'm quite surprised your cooling system is in such a good condition after 130k. When I bought mine one 11xk there was no leak in PPI. But couple of months later I had the following issues:

Drive belt noise - due to failed pulley
Expansion tank leak at the bottom
Thermalstat gasket leak
Radiator leak at side

Water pump is surprisingly good - appears to be original
Belts are good but seems to have been changed - none OEM

So I did my preventive only on water pump and 2 radiator hoses. All others are already due.
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Old 05-26-2013, 08:54 PM   #18
trive2
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Exactly. For just over $300 it's cheaper and easier to just do it all at once.

You would waste potential hours of your time disassembling the same things over and over every time something fails? AND potentially cook an engine or put yourself out for days/weeks for a sudden failure....

To save what, $100?


Just do it.
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Old 05-26-2013, 08:55 PM   #19
trive2
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Exactly. For just over $300 it's cheaper and easier to just do it all at once.

You would waste potential hours of your time disassembling the same things over and over every time something fails? AND potentially cook an engine or put yourself out for days/weeks for a sudden failure....

To save what, $100?


Just do it.
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Old 07-26-2013, 02:05 AM   #20
sihyonkim
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Got quoted around $1200 by my indie to do the system: tank, hoses, thermostat, sensors, water pump. Is that a fair price?
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