Has anyone have just the thermostat go out and not the water pump?

Mr Gasser · 03-31-2016, 01:48 PM

Just as I thought, nobody. Prove me wrong.

Mr Gasser · 03-31-2016, 08:43 PM

crickets, I changed just the water pump with a VDO brand from Germany, it says Continental on it so I'm assuming its the latest design.

Did the bleed procedure and its humming real nicely.

485 plus 3 bolts.

The Wind Breezes · 03-31-2016, 08:46 PM

The thermostat is by all accounts a lot more reliable than the pump, so I would expect they would almost always fail later on.

Mr Rooty Von Tooty · 04-01-2016, 06:00 AM

When my water pump goes out, I'll replace just it. I don't subscribe to replacing parts that aren't broken or haven't failed. Of all the things least likely to fail, the thermostat falls in that category.

I remember a couple of posts where either a coil or injector failed and all six were replaced by the owner or technician. That's just plain crazy and expensive!

Mr Gasser · 04-01-2016, 07:37 AM

Right, have you seen the thermostat on the 135i? it looks pretty rugged. Besides it does appear that it can be changed out without removing the water pump, BTW the upper bolt is not easy to get to on that WP.

Stewy_604 · 04-01-2016, 11:33 AM

Mine went the other way around, but since they usually fail in pairs (or close to), I did the t-stat while I was in there.

Mr Gasser · 04-01-2016, 12:25 PM

Yeah very temping to change out the T stat, but I've search this entire forum and have not seen a T stat failure, just the water pump.

The Wind Breezes · 04-01-2016, 04:02 PM

You should have done the thermostat while you were in there but since they usually fail open you'll probably be OK.

Mr Gasser · 04-01-2016, 06:55 PM

Well how long to we expect the water pump to last normally? 100k? 150K? over 200?

Mr Rooty Von Tooty · 04-01-2016, 08:34 PM

Quote:

Originally Posted by Mr Gasser

Well how long to we expect the water pump to last normally? 100k? 150K? over 200?

They say around 60K miles. That's pretty good for any car!

Stewy_604 · 04-04-2016, 09:25 AM

Mine failed at 50,000 kms...definitely a lot sooner than expected.

twinboost_MD · 04-07-2016, 12:34 PM

the thing has a mind of it own dont pay attention to when anyone elses fails.. theres no average so to say

Mr Gasser · 04-07-2016, 04:03 PM

They are electric, so they fail earlier. But now the thread has been jackknifed to water pumps all over again.

6MT_Addict · 04-08-2016, 10:47 PM

Quote:

Originally Posted by Mr Rooty Von Tooty

When my water pump goes out, I'll replace just it. I don't subscribe to replacing parts that aren't broken or haven't failed. Of all the things least likely to fail, the thermostat falls in that category.

I remember a couple of posts where either a coil or injector failed and all six were replaced by the owner or technician. That's just plain crazy and expensive!

Most replace the T stat as well because of the labour cost. The coolant needs to be drained and Water Pump removed to access the T stat, which is why it's just easier to do them both at once, replacing the T-stat as preventative maintenance

03-31-2016, 01:48 PM	#1
Mr Gasser First Lieutenant 73 Rep 341 Posts Drives: 135i 09 M-Sport Black on Black Join Date: Jan 2016 Location: Texas iTrader: (0)	Has anyone have just the thermostat go out and not the water pump? Just as I thought, nobody. Prove me wrong.
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03-31-2016, 08:43 PM	#2
Mr Gasser First Lieutenant 73 Rep 341 Posts Drives: 135i 09 M-Sport Black on Black Join Date: Jan 2016 Location: Texas iTrader: (0)	crickets, I changed just the water pump with a VDO brand from Germany, it says Continental on it so I'm assuming its the latest design. Did the bleed procedure and its humming real nicely. 485 plus 3 bolts.
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03-31-2016, 08:46 PM	#3
The Wind Breezes Lieutenant Colonel 912 Rep 1,850 Posts Drives: 135i N55 DCT Join Date: Apr 2015 Location: USA iTrader: (0)	The thermostat is by all accounts a lot more reliable than the pump, so I would expect they would almost always fail later on.
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04-01-2016, 06:00 AM	#4
Mr Rooty Von Tooty Banned 117 Rep 460 Posts Drives: 2013 BMW 135i M-Sport Join Date: Jul 2015 Location: Dayton, OH iTrader: (0)	When my water pump goes out, I'll replace just it. I don't subscribe to replacing parts that aren't broken or haven't failed. Of all the things least likely to fail, the thermostat falls in that category. I remember a couple of posts where either a coil or injector failed and all six were replaced by the owner or technician. That's just plain crazy and expensive!
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04-01-2016, 07:37 AM	#5
Mr Gasser First Lieutenant 73 Rep 341 Posts Drives: 135i 09 M-Sport Black on Black Join Date: Jan 2016 Location: Texas iTrader: (0)	Right, have you seen the thermostat on the 135i? it looks pretty rugged. Besides it does appear that it can be changed out without removing the water pump, BTW the upper bolt is not easy to get to on that WP.
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04-01-2016, 11:33 AM	#6
Stewy_604 First Lieutenant 77 Rep 310 Posts Drives: 2011 E82 135i M-Sport Join Date: Aug 2015 Location: Vancouver, B.C. iTrader: (0)	Mine went the other way around, but since they usually fail in pairs (or close to), I did the t-stat while I was in there. __________________ 2011 BMW 135i M Sport Space Grey - BMS JB4, VRSF 3.5" catless DP, Berk exhaust, BMS intake, ER CP, Eibach Pro-Kit, H&R spacers, black kidneys, Blacklines, LUX angel eyes 2014 BMW X5 xDrive 35d M Sport Mineral White - MPBK w/ F85 rotors & Carbotech pads, ACS Springs/Links, iND reflector deletes, iND black roundels, MP black kidneys, M50D grille inserts 2007 Suzuki GSX-R 750 - too much to list
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04-01-2016, 12:25 PM	#7
Mr Gasser First Lieutenant 73 Rep 341 Posts Drives: 135i 09 M-Sport Black on Black Join Date: Jan 2016 Location: Texas iTrader: (0)	Yeah very temping to change out the T stat, but I've search this entire forum and have not seen a T stat failure, just the water pump.
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04-01-2016, 04:02 PM	#8
The Wind Breezes Lieutenant Colonel 912 Rep 1,850 Posts Drives: 135i N55 DCT Join Date: Apr 2015 Location: USA iTrader: (0)	You should have done the thermostat while you were in there but since they usually fail open you'll probably be OK.
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04-01-2016, 06:55 PM	#9
Mr Gasser First Lieutenant 73 Rep 341 Posts Drives: 135i 09 M-Sport Black on Black Join Date: Jan 2016 Location: Texas iTrader: (0)	Well how long to we expect the water pump to last normally? 100k? 150K? over 200?
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04-04-2016, 09:25 AM	#11
Stewy_604 First Lieutenant 77 Rep 310 Posts Drives: 2011 E82 135i M-Sport Join Date: Aug 2015 Location: Vancouver, B.C. iTrader: (0)	Mine failed at 50,000 kms...definitely a lot sooner than expected. __________________ 2011 BMW 135i M Sport Space Grey - BMS JB4, VRSF 3.5" catless DP, Berk exhaust, BMS intake, ER CP, Eibach Pro-Kit, H&R spacers, black kidneys, Blacklines, LUX angel eyes 2014 BMW X5 xDrive 35d M Sport Mineral White - MPBK w/ F85 rotors & Carbotech pads, ACS Springs/Links, iND reflector deletes, iND black roundels, MP black kidneys, M50D grille inserts 2007 Suzuki GSX-R 750 - too much to list
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04-07-2016, 12:34 PM	#12
twinboost_MD Private First Class 19 Rep 188 Posts Drives: AW 135i Join Date: Feb 2015 Location: Washington, DC iTrader: (0)	the thing has a mind of it own dont pay attention to when anyone elses fails.. theres no average so to say
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04-07-2016, 04:03 PM	#13
Mr Gasser First Lieutenant 73 Rep 341 Posts Drives: 135i 09 M-Sport Black on Black Join Date: Jan 2016 Location: Texas iTrader: (0)	They are electric, so they fail earlier. But now the thread has been jackknifed to water pumps all over again.
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