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BMW 3-Series (E90 E92) Forum
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Thermostats - when to change
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01-29-2013, 07:27 AM | #1 |
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Thermostats - when to change
Ive observed that thermostat failure does seem to be a recurrent problem with 6 pot diesels and is not a major issue to solve if you know its happening. But these cars do not have a temp gauge and so the problem can go unnoticed for some time with poor MPG and DPF problems being the result.
Would anyone recommend that the thermostats are changed as a matter of course if you are unable to measure coolant temp ? What would be a sensible change period ? I use my Android phone app to keep an eye on coolant temp but ofcourse other people do not have or want to be bothered with that ability.
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01-29-2013, 11:10 AM | #3 |
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another point is how long it takes to warm up, when I first bought my 330d it took ages to warm up (warm air from heater) about 3 miles, after changing both stats I get warmish air after 1/2 mile and thats in this cooler weather.
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01-30-2013, 01:45 PM | #4 |
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Ive been logging the temperature of the coolant for the last 2 weeks and no matter what driving style and current climate my temps always level off around 78-80c Took this to BMW thinking in their genius they might actually look at it but no, got a phone call today saying theres not a problem with them!
Will ring them tomorrow again to question their EGR "testing" methods!! for what its worth it seems easier to change them yourself!!! |
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01-30-2013, 02:01 PM | #5 | |
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what really should happen is they take the car on a test drive and monitor the temp when air is being forced through rad. Going into hidden menu, take a mechanic out with you on test drive but this is more like annoy the dealer as you should not know about this hidden feature and how dare you tell us what is wrong with the car and should let us investigate, pay us the diagnostic fee to tell you what you already know (you can see I have had expereince with this ) |
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01-30-2013, 02:38 PM | #6 | |
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01-30-2013, 04:03 PM | #8 |
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Haha, can you tell I'm an engineer.... Just using the torque app for android and a Bluetooth obd scanner. Then export the logs, import in excel and hey presto, instant BMW dealership ammo!!
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01-30-2013, 04:15 PM | #9 | |
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I think one of the problems, the average mechanic doesn't grasp how the BMW coolant circuit flows, and are not aware the EGR thermostat can short circuit and by-pass the main thermostat. With a flow of at least 3-litres a minute (from a simple gravity flow test) though a failed EGR 'stat, that's a lot of heat loss and equates to about 18kW from 0 - 90C from some quick calcs. Never mind a pumped circuit and the chilling of cold coolant from the low side of the radiator. If they don't make a road test and get real time temperatures it means nothing, as a static workshop 'warm up' is not a test at all. HighlandPete |
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01-30-2013, 04:19 PM | #10 |
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01-30-2013, 04:20 PM | #11 | |
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01-30-2013, 04:22 PM | #12 |
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01-31-2013, 06:37 AM | #14 | |
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Drives: G22 M440D
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Where did you get your reference curve? Did that come from your app? Has all the info I was looking for : max temperature, and also predicted dynamic time to reach that temp - though that must have some tolerance due to possible varying engine loads during that time? I'm presuming the app requires you actually road testing, and not static (as Pete also pointed out). Looking into that app now. Dave
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Escort Mk1 RS2000 (2.1 2x44IDFS, BVH, Kent FR32, 5spd, 180 BHP) : M440D ¦ Previously : F32 435D : F32 430D M Sport sDrive, 335D E92 2006
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01-31-2013, 07:13 AM | #16 | |
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I know from my own 330d you can even have temperature drop back during a proper warm up cycle. Simply due to coming off load on a long overrun, as there is just not enough waste heat to spare. HighlandPete |
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01-31-2013, 07:14 AM | #17 |
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01-31-2013, 07:38 AM | #18 | |
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Drives: G22 M440D
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My temperatures are very similar to the graph posted - but probably take a bit longer to get to that temperature. Will be interesting to see how you get along, blutak. D.
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Escort Mk1 RS2000 (2.1 2x44IDFS, BVH, Kent FR32, 5spd, 180 BHP) : M440D ¦ Previously : F32 435D : F32 430D M Sport sDrive, 335D E92 2006
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01-31-2013, 12:55 PM | #20 | ||
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The tech said he took the car for a test spin around town and it seemed to heat up. It seems that in order for the part to be replaced under warranty it needs to be faulty and since there is no error code produced from this mechanical part they won't replace it. I keep telling them its not that its broken its that its not operating as efficiently as it should be. Think im just gonna change them myself... Quote:
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01-31-2013, 04:16 PM | #21 | |
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I used this one (attached below) which is written by a member on here (credit shane55 - thank you!) From Real OEM, looks like yours will be the same as mine for a 325d (same block, so makes sense) Main stat: 11517805811 - http://realoem.com/bmw/showparts.do?...65&hg=11&fg=35 EGR stat: 11717787870 - http://realoem.com/bmw/showparts.do?...97&hg=11&fg=50 Don't forget to order this: 11532248435 (O-Ring for EGR stat) and a bottle of BMW coolant at the same time. Last edited by coopersim; 01-31-2013 at 04:19 PM.. Reason: Add credit |
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