Thermostat Replacement

v8killah · 01-19-2017, 11:56 AM

Hi - my water pump recently stopped working on my '08 335xi, so I bought a new thermostat while I was at it and had my local indy shop replace both. Water pump works fine now, but the new thermostat is stuck open, thus, I need to have the work done again to replace it... Does anyone know if the one-time use bolts need to be purchased again for a thermostat-only replacement (i.e., does the water pump need to be removed as well)?

Thanks

bradsm87 · 01-19-2017, 03:51 PM

How sure are you that the new thermostat is stuck open and that the DME isn't targetting a low coolant temp due to a fault? Have you checked for fault and shadow fault codes?

v8killah · 01-23-2017, 12:37 PM

How could I determine if it's a fault versus stuck open thermostat? Also, what would cause the fault after a replacement?

Thanks

Jaronbwall · 01-23-2017, 11:00 PM

Did you run the test to check the new water pump?

bradsm87 · 01-24-2017, 02:31 AM

Quote:

Originally Posted by v8killah

How could I determine if it's a fault versus stuck open thermostat? Also, what would cause the fault after a replacement?

Thanks

Read DME fault codes and shadow fault codes.

v8killah · 01-25-2017, 12:03 PM

New waterpump works since I am not overheating now. I had codes (now erased) that indicated that the car was taking too long to heat up, so I assumed that the thermostat was stuck open.

Quote:

Originally Posted by Jarronbwall

Did you run the test to check the new water pump?

ATLIEN · 01-26-2017, 01:32 PM

Quote:

Originally Posted by bradsm87

Read DME fault codes and shadow fault codes.

I am curious. What would those codes say?

bradsm87 · 01-26-2017, 11:10 PM

Quote:

Originally Posted by ATLIEN

I am curious. What would those codes say?

It could be one of many fault codes. A car in perfect running order produces no codes. You need to check for codes then investigate the result.

01-19-2017, 11:56 AM	#1
v8killah Private 10 Rep 62 Posts Drives: 335xi Join Date: Jan 2011 Location: PA iTrader: (0)	Thermostat Replacement Hi - my water pump recently stopped working on my '08 335xi, so I bought a new thermostat while I was at it and had my local indy shop replace both. Water pump works fine now, but the new thermostat is stuck open, thus, I need to have the work done again to replace it... Does anyone know if the one-time use bolts need to be purchased again for a thermostat-only replacement (i.e., does the water pump need to be removed as well)? Thanks
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01-19-2017, 03:51 PM	#2
bradsm87 Lieutenant Colonel 606 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	How sure are you that the new thermostat is stuck open and that the DME isn't targetting a low coolant temp due to a fault? Have you checked for fault and shadow fault codes?
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01-23-2017, 12:37 PM	#3
v8killah Private 10 Rep 62 Posts Drives: 335xi Join Date: Jan 2011 Location: PA iTrader: (0)	How could I determine if it's a fault versus stuck open thermostat? Also, what would cause the fault after a replacement? Thanks
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01-23-2017, 11:00 PM	#4
Jaronbwall Driving cars and riding bikes really fast 298 Rep 1,027 Posts Drives: 2009 335i Join Date: Sep 2014 Location: Indianapolis iTrader: (0)	Did you run the test to check the new water pump? __________________ 335i, sport pkg, 3 pedals, Blacked out, LED markers, OZ Ultraleggera wheels, Firestone Indy 500s, x-pipe, vibrant 1792, PE mod MHD stage 2+, BMS DPs, ARM charge pipe, Tial BOV, ARM FMIC, dual cone, CSF radiator, M3 control arms, sways, HAWK pads. https://www.strava.com/athletes/8309149 Follow me on Strava
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