[forrealb50]

My SES light came on this morning and took the car to the dealer. The thermostat is stuck open and they want $710 to replace the thermostat because it's stuck open. I've replaced the thermostat is all my other cars with no problem. Is this BMW any different than an e36? I can't find an DIY on the project. Thanks!

Any help would be great! I need to pick the car up in a hour and need to know if I should just leave it there. If it's like any other thermostat change I know I can do it.

[forrealb50]

Also, do the e90's thermostats designed to fail open. Am I okay to drive the car until I get the parts?

[raceyBMW]

The thermostat on the E9x is electric, not mechanical like on your E36. Stuck open is not a big deal other than your heater taking a long time to get warm....doesn't affect much else.

The Bentley Manual has a diy...on realOEM the part is #11537549476 and is around $120...the amount your dealer quoted you is just robbery.

The install is actually probably easier than on the E36 since its not mounted to the block.

[forrealb50]

Originally Posted by raceyBMW

The thermostat on the E9x is electric, not mechanical like on your E36. Stuck open is not a big deal other than your heater taking a long time to get warm....doesn't affect much else.

The Bentley Manual has a diy...on realOEM the part is #11537549476 and is around $120...the amount your dealer quoted you is just robbery.

The install is actually probably easier than on the E36 since its not mounted to the block.

Great info! I just bought the thermostat myself and BMW coolant. I'm going to replace it myself and save $500. Thanks again for the great info.

[GMWNashville]

the install is harder than an e36 id say...it doesnt get much easier than e36's and e46's..but have at it!

[forrealb50]

Okay cool. I wanted to make sure there wasn't some speacial tool or computer I had to use to do the job right.

[raceyBMW]

Don't forget to read up on the Coolant Change DIY...it tells you the process to bleed the coolant system after you refill.

[deathsightx]

It's easiest to do it from the bottom of the car too, a flexable 6mm driver will come in handy. As stated above make sure you look up the bleeding procedure, it is different and very specific, make sure you follow it exactly or you may run into problems

[forrealb50]

Originally Posted by deathsightx

It's easiest to do it from the bottom of the car too, a flexable 6mm driver will come in handy. As stated above make sure you look up the bleeding procedure, it is different and very specific, make sure you follow it exactly or you may run into problems

Where is the DIY? I can't find it for the e90.

[AlanAZ]

In the DIY section, search on coolant:

http://www.e90post.com/forums/showth...hlight=coolant

[ENINTY]

I'm having the same problem with my car. I've been resetting the SES light hoping the thermostat will work itself back into shape (it's on again this week). When I did the coolant flush I noticed the thermostat looked a bit of a PIA to replace. It's right next to the water pump and the steering rack and sway bar is in the way. I don't see how you could get to it from the top; it's a from-the-bottom procedure.

Good luck, let us know how it goes. The coolant flush is easy.

[GMWNashville]

yes its from the bottom-yes its a pita...as for the tstat fault itself what typically goes bad is the map portion of the tstat which is a heated portion to open the tstat slightly at an earlier point than it would typically open if just left to heat the wax pellet...

[ENINTY]

Originally Posted by volkswackin

yes its from the bottom-yes its a pita...as for the tstat fault itself what typically goes bad is the map portion of the tstat which is a heated portion to open the tstat slightly at an earlier point than it would typically open if just left to heat the wax pellet...

That's what the code reads "2EF4 map thermostat, mechanics Error". I guess there is no way to just replace the heater. Can it ever be a just dirty connector?

[forrealb50]

Thanks! I followed the DIY for the coolant change. Got it all finished in 3 hours. I also ran the bleed cycle 3 times. I love the way BMW designed bleeding the coolant system.

[GMWNashville]

Originally Posted by ENINTY

That's what the code reads "2EF4 map thermostat, mechanics Error". I guess there is no way to just replace the heater. Can it ever be a just dirty connector?

ive seen the connectors get damaged but never really seen one just be dirty as theres a seal there for the connector...no way to just replace the heater...

[ENINTY]

Originally Posted by volkswackin

ive seen the connectors get damaged but never really seen one just be dirty as theres a seal there for the connector...no way to just replace the heater...

Thanks for the info.

[JamesUKE92]

I see you already fixed this, but for anyone else searching around for pump / thermostat replace info, see all my pics on this at:

http://www.e90post.com/forums/showthread.php?t=347412