Check out my thermostat!

Specific conversations and info for the BMW E28 M5 and M535i.
M5BB
Posts: 1500
Joined: Jun 13, 2007 10:13 AM
Location: Peachtree Corners, Georgia

Post by M5BB »

Just saw this.........
Looks like the ccorrect item

http://cgi.ebay.com/ebaymotors/BMW-e24- ... 35adfe6f66
Karl Grau
Posts: 9630
Joined: Mar 10, 2006 8:34 PM
Location: On the Beach

Post by Karl Grau »

I would certainly hope it's the correct one since it's over $50.00 with shipping. :shock:
rollcentre
Posts: 354
Joined: Nov 30, 2012 12:52 PM
Location: Dallas tx

Post by rollcentre »

This forum is such a wealth of info!

Blunttech's picture seems to show the incorrect t-stat though. am I right?

http://www.blunttech.com/ShopByVehicle. ... at&mode=PA
tschultz
Posts: 3904
Joined: Mar 01, 2009 8:58 PM
Location: Denver, Colorado
Contact:

Re: Check out my thermostat!

Post by tschultz »

Just doing some research and found something curious. Does anybody know if the S38 thermostat is the same as the M30B34 (early model)? From photos it looks very similar (see the photo from page 1).

Some good information worth sharing from bigcoupe.com
hornhospital wrote:Correct thermostat installed (NAPA #148). Works great. Turns out my '85 635CSi takes the old style thermostat, so I'll buy it from my buddy to use on my car when the time comes.

Thermostat comparison. Old style on left, Stant 13558 that fits the A 4.1 housing; new on right, NAPA #148 (Stant 13588 equivalent, direct replacement for a BMW 11 53 1 713 040), fits the new housing A 4.2

Image
Check the Stant part numbers carefully:
The early type is .. 13558
The later type is ... 13588

You can go to the Stant web site and use their parts locator:
http://www.stant.com/Parts-Locator/

Click on the part number for detailed info. Below is the info for an '87 635 (later style housing - they changed some time in '86):

Product Type is OE Exact Thermostat - Includes the Seal:
Stant Part Number ...... 48038 (176?)
BMW ........................ 11 53 1 713 040
CARQUEST ................ 38038
Gates ....................... 33974
Gates Canada ............ 33974
NAPA ........................ 455208

__________

Product Type is OE Type Thermostat - No Seal:
Stant Part Number .... 13588 (176?)
CARQUEST ................ 31238
Gates .......... ............ 33518
Gates Canada ........... 33518
NAPA ....................... 148
Stant (Carded) .......... 35588

____________

You can also download their application guide. Below is an excerpt:
http://www.stant.com/Download-Center/Application-Guides

633CSI
6-Cyl. 196
1979-1978; OE Type Thermostat ............................ 13558 - 180? (OE Temp)
1979-1978; Thermostat Seal ................................. 25271
1979-1978; Thermostat Seal (1 Pack) ..................... 27271
6-Cyl. 3.2 L
1984-1980; OE Type Thermostat ............................ 13558 - 180? (OE Temp)
1984-1980; Thermostat Seal .................................. 25271
1984-1980; Thermostat Seal (1 Pack) ...................... 27271

635CSI
6-Cyl. 3.5 L
1989-1986; OE Exact Thermostat .................................. 48038 - 176? (OE Temp- Seal included)
1989-1986; OE Type Thermostat ................................... 13588 - 176? (OE Temp)
1989-1986; Thermostat Seal ........................................ 25271
1989-1986; Thermostat Seal (1 Pack) ............................ 27271
1985; OE Type Thermostat ........................................... 13558 - 180? (OE Temp)
1985; Thermostat Seal ................................................. 25271

A more detailed Cross Reference:
ACDelco Aftermarket - 12T29D
Atlas - 644-361
Atlas - 644-368
Bap-Geon - 28-12180
Bap-Geon - 28-19880
Bap-Geon - 28-19881
Bap-Geon - 28-19882
Beck Arnley - 143-0404
Beck Arnley - 143-0578
Beck Arnley - 143-0602
Beck Arnley - 143-0664
BMW - 11531253249
BMW - 11531265085
BMW - 11531307737
BMW - 11531365085
BMW - 11531513040
BMW - 11531721218
British Leyland - EBC3621
British Leyland - JLM322
Calorstat - VB35-V6833
Calorstat - VB35-V6998
Caltherm - VB35-V6833
Caltherm - VB35-V6998
Caltherm - VB35-V6999
CARQUEST - 31238
Cew Dist. Co. Ltd. - 4030 080
Cew Dist. Co. Ltd. - 4031 280
Cew Dist. Co. Ltd. - 4034 480
Chrysler - T0697157
Eaton Corp. - ET-31-180
Eaton Corp. - ET-35-180
Eaton Corp. - ET-37-180
Ford Motor Co. - E45Y 8575 A
Gates - 33518
Gates Canada - 33518
Ideal Aftermarket - 31238
Lazorlite - U33-9254
Lazorlite - U33-9273
Lazorlite - U33-9283
Lazorlite - U33-9353
Lazorlite - U33-9423
Mercedes-Benz - 0022037575
Mercedes-Benz - 0022038075
Mercedes-Benz - 22037575
Mercedes-Benz - 22038075
Mercedes-Benz - 6012000115
Mercedes-Benz - 6172002415
Motorcraft - RT-1040
Motorcraft - RT-365
NAPA - 148
Porsche - 92810612906
Renault - 7701349415
Robertshaw - 310-180
Robertshaw - 341-190
Robertshaw - 397-180
Robertshaw - 410-180
Robertshaw - 715-185
Standard Thomson - 148
Stant - 13588
Stant (Carded) - 35588
Stant (Small Card Retail) - 35588
Tridon Aftermarket - 673780
Triscan - 8620-2582
Vera - 56-00325
Vera - 56-00630
Vera - 56-00945
Vera - 56-00978
Volkswagen - 035121113
Volkswagen - 035121113B
Volkswagen - 069121113
Volkswagen - 077121113
Volkswagen - 35121113
Volvo - 2737266
Volvo - 273728
Wahler - 4049.80D
Wahler - 4049.83
Wahler - 4088.80
Wahler - 4147.80
Waltham - W148
World Parts - 143-0664
World Parts - W57-144

As indicated earlier in this thread, real oem indicates 11531307737 (for S38) and the early model M30 part number is 11531254065 for E3, E9, E12, and early E24's/E28's before '85. It sure looks the same.

Mostly I wanted to include this detail regarding the early/late thermostats for the m30 because years ago I purchased the incorrect one not knowing there was a difference.



EDIT: The M5 thermostat is exclusive to the M5/M6.
alexdparsons
Posts: 10
Joined: Jan 02, 2014 3:14 PM
Location: Los Angeles, CA

Re: Check out my thermostat!

Post by alexdparsons »

I recently replaced the thermostat on my s38b35 thinking it couldn't hurt. According to the temperature gauge I was at times running a bit hot — dead noon when moving along with any speed, but in stop & go traffic inching up to 12:30 or 1pm. It's still not hot enough, I believe, for the aux fan to kick in so I thought maybe the thermostat was not popping open soon enough.

I verified that I have the right replacement stat (wahler ending in 737), and visually it looked identical to the original one I pulled out (BMW-marked Wahler ending, somewhat surprisingly, in 738). But something's amiss with my install as the engine is now running cool with any amount of speed / coolant pressure so it seems the stat is being bypassed.

A few things I wasn't certain of when doing the install (couldn't find a detailed description of how to do it anywhere, it's always presented as being so easy there's not much guidance):

• The Wahler replacement came with a flat (square edged) gasket that fits nicely on the inlet side of the stat, but the original had no washer here, so I didn't use it
• The replacement o-ring (ordered from Pelican based on etk / realoem part number) is definitely round, while what was left of the original gasket seemed to be square edged but maybe just from being compressed between the thermostat housings
• The original thermostat was nicely lodged into place, but the new one never seated well enough. I had to hold it in place as best I could while fitting the housings together so maybe it's seated at a strange angle or off-axis.

If anyone has any ideas on what I've done wrong, I'd appreciate a little help. Don't love the idea of draining yet more blue coolant out, redoing it and making the same mistake yet another time.... so trying to educate myself a bit better this time around.

Thanks!
alexdparsons
Posts: 10
Joined: Jan 02, 2014 3:14 PM
Location: Los Angeles, CA

Re: Check out my thermostat!

Post by alexdparsons »

Following up on this topic of my seemingly nonstandard s38 thermostat, I'm attaching some pictures (the original is at bottom, and at right) and also noting that:
– my m5 was built in October '87, the next to last month they were built, maybe there's a different thermometer housing?
- you can see on the thermostat housing stamping that the part number ends in 237, not the 236 as realoem and the etk suggest
- the original thermostat looks pretty close to the replacement I got from Pelican, but the diameter of the stopper is smaller, and the part number ends in 738, not the 737 as realoem and the etk suggest and what I ordered from Pelican
- I haven't been able to find these parts with these part numbers

Any advice on fitting a proper 'stat is much appreciated.

Image
Image
Image
Image
Image
rustlers1911
Posts: 42
Joined: Nov 22, 2013 6:39 PM

Re: Check out my thermostat!

Post by rustlers1911 »

alexdparsons wrote:Following up on this topic of my seemingly nonstandard s38 thermostat, I'm attaching some pictures (the original is at bottom, and at right) and also noting that:
– my m5 was built in October '87, the next to last month they were built, maybe there's a different thermometer housing?
- you can see on the thermostat housing stamping that the part number ends in 237, not the 236 as realoem and the etk suggest
- the original thermostat looks pretty close to the replacement I got from Pelican, but the diameter of the stopper is smaller, and the part number ends in 738, not the 737 as realoem and the etk suggest and what I ordered from Pelican
- I haven't been able to find these parts with these part numbers

Any advice on fitting a proper 'stat is much appreciated.

Image
Image
Image
Image
Image

Was there any resolution here? I seem to be having the same issue. The number on my housing is 11531307736, not 11531307737. I have the correct Wahler thermostat from everything I can tell. When I opened up my housing there was no thermostat in it but there was a gasket with squared edges. The Wahler thermostat I have does not seem to fill the housing and the gasket does not seem to seat correctly?

I am left with the conclusion that either I have a different housing or the thermostat is supposed to sit in the housing in a loose manner. Any direction here?
alexdparsons
Posts: 10
Joined: Jan 02, 2014 3:14 PM
Location: Los Angeles, CA

Re: Check out my thermostat!

Post by alexdparsons »

In the end, it seems many suppliers are still having issues stocking the correct thermostat. The first replacement I had ordered (pictured above) from pelican parts. It's well documented that they were sending out the wrong part in the past, but I presumed bc the part I received looked more similar to the original stat that this wasn't the case for me. And surely they would have fixed this issue if it had happened so often before, right? But to rule it out I ordered a BMW part from Maximilian but once again a dud. I figured out however that it had been drop-shipped from Pelican even though ordered through Maximilian at BMW prices. After calling them up they sorted it out and sent another, finally the actual BMW part that is a perfect match for the original stat.

Moral of the story, beware pelican and maximilian and others selling OE stats. The only sure way to get the right part is to order from a BMW shop. I've had a great experience working with www.mybimmerparts.com, the eCommerce arm of Passport BMW dealership. They have great prices and a better process for making sure you're getting the right parts.
rustlers1911
Posts: 42
Joined: Nov 22, 2013 6:39 PM

Re: Check out my thermostat!

Post by rustlers1911 »

alexdparsons wrote:In the end, it seems many suppliers are still having issues stocking the correct thermostat. The first replacement I had ordered (pictured above) from pelican parts. It's well documented that they were sending out the wrong part in the past, but I presumed bc the part I received looked more similar to the original stat that this wasn't the case for me. And surely they would have fixed this issue if it had happened so often before, right? But to rule it out I ordered a BMW part from Maximilian but once again a dud. I figured out however that it had been drop-shipped from Pelican even though ordered through Maximilian at BMW prices. After calling them up they sorted it out and sent another, finally the actual BMW part that is a perfect match for the original stat.

Moral of the story, beware pelican and maximilian and others selling OE stats. The only sure way to get the right part is to order from a BMW shop. I've had a great experience working with http://www.mybimmerparts.com, the eCommerce arm of Passport BMW dealership. They have great prices and a better process for making sure you're getting the right parts.

So you did have the correct housing just the incorrect thermostat?

This is the part I ordered http://www.amazon.com/gp/product/B009PV ... ge_o05_s00
alexdparsons
Posts: 10
Joined: Jan 02, 2014 3:14 PM
Location: Los Angeles, CA

Re: Check out my thermostat!

Post by alexdparsons »

Yes, housing was correct and the thermostat wrong. Disregard the numbers stamped on both the housing and the original thermostat. I've learned that hese don't necessarily correspond to the part number for whatever reason. And that's true for a lot of other parts that have come out of the car (control arms, struts, etc).
88mmmmm
Posts: 21
Joined: Nov 02, 2015 6:43 PM
Location: Woodstock Georgia

Re: Check out my thermostat!

Post by 88mmmmm »

Yes after all these years it is still difficult to get the correct t stat. I got one from Napa and one from Oreilly and both were wrong, with the domed top, and would not seal correctly. I will now order one on line from Bavauto. I thought I was losing my mind until I ran across this post. Thanks again mye28
alim_h
Posts: 57
Joined: Mar 09, 2015 3:10 PM
Location: Albuquerque, NM

Re: Check out my thermostat!

Post by alim_h »

rustlers1911, can you confirm the one you ordered from Amazon is correct?

My temp gauge is always on the cool side. When I run the car hard it'll get up to the middle but will run a bit cool as soon I let off the gas. Also, not much heat in the cabin. I know the valve us clicking on that lets the coolant into the heating core so the coolant itself must be cool. I'm guessing the tstat is stuck open.
rustlers1911
Posts: 42
Joined: Nov 22, 2013 6:39 PM

Re: Check out my thermostat!

Post by rustlers1911 »

Sadly, I cannot confirm that the amazon thermostat is correct. I could never get it to seal well with the provided gasket. I fabbed a new gasket up to make it work and now the car is always at the halfway point on the gauge and I have heat in the cabin again. But I have changed the thermostat on many other cars and never had this issue so I have to assume the amazon one was not the right one. I am going to have my local BMW guru take a look at it when I take the M5 in to have the valves adjusted. I will report back then but that may be a month or two.

It would be great if someone could confirm a source for the right thermostat.
brickwhite
Posts: 681
Joined: Sep 18, 2012 3:49 PM
Location: Jackson, MO North of Memphis, South of St. Louis, Middle of No-where

s38/m88 themostat

Post by brickwhite »

None of the old pictures work... does anyone know which is correct?

-- it should be this one... @ $60

https://www.fcpeuro.com/products/bmw-en ... 31307737oe

Image
Image

Genuine BMW 11531307737... Looks like the one I Pulled out of my car.
downforce22
Posts: 65
Joined: Apr 06, 2015 9:24 PM
Location: colorado springs

Re: Check out my thermostat!

Post by downforce22 »

Good thread. I ordered a thermostat and got sent the wrong one I will have to check the 737 part and see if that is the correct one. The one I was sent appears to have a different number on the receipt after I got to looking at the packing slip. MAH-TX2180D which looks more like an m20, maybe m30 thermostat.

I ordered this and was sent the one from ECS tuning which does not fit: BMW Thermostat 80 deg. - Mahle Behr 11531307737 1 $14.29
Image

https://www.fcpeuro.com/products/bmw-en ... 31307737oe

Make sure to get the genuine part number with 737

Image
cgraff
Posts: 1377
Joined: Feb 12, 2006 1:00 PM
Location: New Jersey
Contact:

Re: Check out my thermostat!

Post by cgraff »

Yes get the genuine bmw oe part. Fcp, ecs, pelican sell a mahle/behr that they say cross references, but that is actually not true. I bought one to do as replacement with my engine swap refresh but it did not fit. Sent it back (to pelican) but they have not corrected their website.

It’s probably an error in cross referencing on the oem’s side (behr) that is being perpetuated. Hopefully they will correct it.
Post Reply