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BMW 3-Series (E90 E92) Forum
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Cooling system replacement
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07-20-2016, 01:49 PM | #1 |
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Cooling system replacement
Hi all, I just bought an E90 and I wanted to get your advice on the cooling system overhaul. The car has 101K miles on it without a water pump replacement so I'd rather just do it myself (plus thermostat) to save the headache later on. However, since I'm working on the system already, what are your thoughts on replacing these additional components:
1) Radiator 2) Hoses. I know replacing all nine will be difficult without a lift but how about if I just do the main two or three hoses? After all this, I'll have to do the VC gasket as well so I'll replace the plugs when I'm in there--trying to save some time! I think I'll be getting these parts from OEMBimmerParts once I make a decision. Thanks in advance |
07-20-2016, 02:09 PM | #2 |
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Download the Mike Miller old school schedule.
Download the Mike Miller old school schedule.
Most of the radiators in my other cars have lasted about 125 k . When it gets up around this milage its best to have regular pressure tests at least. Google Mike Miller BMW and download the old school maintenance schedule he goes over what should be replaced if you do aircraft maintenance( change things based on time and use) If you do to many things at once and something goes wrong it will be more difficult to isolate the problems. So change the plugs then test. |
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07-20-2016, 02:26 PM | #3 |
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Radiator failures don't seem very common the E90.
A member posted about changing his coolant hoses around 250k miles. He said some of them are extremely difficult to get to, and that they all still looked alright even at that mileage. It shouldn't be hard to do the upper and lower radiator hoses if you want, but they'll also probably be fine. There's a vent hose above the radiator that has been known to fail though. It's cheap, something like $35. |
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07-20-2016, 02:59 PM | #4 |
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FYI, Mike Miller has retracted his blanket recommendation "to replace cooling system at 60K-90K". He notes that the modern cars have more reliable components, and the ECU shuts down the motor if things overheat. He wrote that in Roundel, and I believe his most recent guide has it.
The pump is pretty expensive ($400-$500 or so) and the thermostat is close to $100, so it's pretty pricey to replace them "just because". (Granted, early electric water pumps for the E9x failed earlier than they should.) Although radiators did fail (in older cars, E46 and such), the expansion tank was the real baddy. |
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07-20-2016, 07:18 PM | #5 | |
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Typical failure of the top hose connection. Crap plastic tanks.
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07-20-2016, 07:32 PM | #6 | ||
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07-20-2016, 11:24 PM | #7 | ||||
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Quote:
Quote:
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Thanks for all the insight. |
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07-21-2016, 12:04 AM | #8 | |||||
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07-21-2016, 04:16 AM | #9 |
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I'm on the original radiator and reservoir tank at 306K. I did all the hoses at 230K and none needed replacing. My T-stat went at 136K. WP went at 156K. My advice is get a BMW scan tool and check for codes and replace WP/T-stat when codes show up.
Last edited by Efthreeoh; 07-23-2016 at 06:28 AM.. |
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07-21-2016, 11:10 AM | #11 |
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Carly app and or a coding cable and download
Carly app/cable or bluetooth dongle and or a coding cable and download
from the coding cable subforum. Apparently there is now a cell phone version of Inpa to. If you get the coding cable istad/p to . |
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07-21-2016, 11:40 AM | #12 | |
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As far as a scan tool, you'll hear around here Carly app and a cable from eBay. I have the Bavarian Tech and Foxwell tools. Anything that reads BMW codes is what is needed. I like the Foxwell unit as it doubles as an OBD2 scan tool as well, so you can use it on any OBD2 compliant vehicle. |
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07-21-2016, 10:27 PM | #13 | |
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I read some people had problems with the expansion tank connector breaking off when they removed the hose, so be careful with that. |
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07-22-2016, 11:57 PM | #14 | |
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Drives: 2007 Black/Black 335i e90
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If your at 101k, your water pump and thermostat is on borrowed time. So, yes replace the water pump and thermostat. You should also replace the U shaped hose that connects the two. At 100k, I'd do the following : 1) belts & pulleys 2) spark plugs 3) coils 4) transmission fluid, filter pan & megatronic seal 5) differential fluid 6) O2 sensors 7) Coolant flush and change 8) Any gaskets that have not gone yet A) VC B) oil filter housing gasket C) vanos solenoid gaskets plus clean the solenoids out D) cam shaft position sensor gaskets 9) shocks & struts, if you haven't done them by now 10) Walnut blast the intake valves & replace the intake gaskets and throttle body gasket 11) run an oil flush and replace the oil and filter 12) clean the MAF sensor and pressure sensors 13) clean and re-oil your air filter 14) replace the power steering fluid Every 100k on a BMW you are gonna put $2000.00 to $3000.00 into the car, so it can go the next 100k without too many problems Look at FCP Euro. You get a lifetime warranty on any part you buy from them. |
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