testing a soft failing thermostat e46|e46 thermostat bad signs : export Meaning if your temp gauge doesn't seem to be budging after a few minutes of driving even up the road seems like you might have a thermostat that has failed open.
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A failed open thermostat will give you normal operating temps at idle but reduced temps on a highway run. The only way to really confirm a soft thermostat is to quench the radiator with a garden hose to super cool the radiator and then watch the . Hey all I know the usual signs of a bad thermostat is either an error code or the temperature gauge would be stuck in the cold section. . If you have a soft-fail open t-stat you won't achieve full operational temp when it's cold ambient, but when ambient is not that cold you will.
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Meaning if your temp gauge doesn't seem to be budging after a few minutes of driving even up the road seems like you might have a thermostat that has failed open. Diagnose and Fix your car yourself with a Bluetooth OBDII Adapter (Android Phones): https://tidd.ly/39772xz (Download the Android Torque Lite App for free)Yo.
It takes a healthy 3.0L M54 about 7-8 min to warm up in winter and almost 20 min to warm up with a failed thermostat. You may or may not have a P0128 code for thermostat failure. Here's a . Replace thermostat if needed. Rebleed if you replace thermostat. Repeat test to make sure new thermostat opens when car is at operating temp; Put fan back on. If upper hose is hot while lower hose and radiator are cold, your thermostat is probably stuck closed. Hi jfoj, I wish it was a simple thing such as a soft failing thermostat or an o-ring leak. It's not. I am familiar with your threads and I did check the operating temp - the engine warms up fast and reaches 97C in less that five minutes from cold start. CCV, hoses, engine gaskets - all this is taken care of. For what it's worth..I recently had the coolant temp sensor in the block (cyl 6 under intake) go bad and let me tell you.. when I put a new one in (with the oil sensor in Oil Filter Housing) my new (3rd one lol) soft-failing thermostat stopped soft-failing :lool: - It now runs like it did back when I got it again
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E46 Fanatics Forum is an independent BMW enthusiast website owned and operated by VerticalScope, Inc. Content on E46 Fanatics Forum is generated by its users. E46 Fanatics Forum is not in any way affiliated with Bayerische Motoren Werks AG VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada This is problematic for at least a couple of reasons. Your needle will stay at the 12 o'clock position even if you have the all-too-common soft failing thermostat (See jfoj's excellent thread on this issue and related problems ). This was true on my wife's car, which ran in the 77-87ºC range without turning on the service engine soon light (SES). Thermostat - Wahler; Expansion Tank - Rein; Expansion Tank Retainer - Rein; . I too had a newly replaced cooling system after buying a new to me e46. I replaced the entire system (except radiator) in Late 2020. . in Late 2020. Too soon for a failed WP. I did the remove the splash shield and I was lucky (sort of) that there was BLUE .
So after reading the temp gauge buffer reprogramming thread and the thermostat soft failing thread mentioned within, I do believe I might have a soft failing thermostat to the low side. Its consistently quite cold here, and would line up with what I am experiencing, if the 12 o’ clock temp gauge buffer is to be trusted. The following article provides detailed instructions on performing a thermostat replacement on a BMW E46 3 series car. Even though we have used a 2003 BMW 325ci to perform this installation, this article can be applied to any E46 3 series vehicle, including the 323i, 328i and 330i coupe, sedan and convertible. The thermostat is likely soft failing, opening at too low a temperature. It’s easy to test the thermostat in hot water on the stove. The engine temperature gauge is based on the coolant temperature sensor on left side of the head next to cylinder #6. I can tell the car won't start right if the pump primes and stops. Sort of sounds like wrrr click, wrrr click, wrrr click. It'll do it about 5 times. It sounds like if the self test fails the pump is told to shut off. I assumed the pump would throw codes if it was failing. Would I be able to test the voltage to detect the soft failure?
I have a soft-failing T-stat, just like so many you mentioned in your thread. It opens too soon; takes 25 mins. to get to 95C. Will install a replacement this weekend and do some diags on the old part. Would like to figure out exactly why they fail in this manner. Have you ever done this?
This freaked me out, so the first thing I did was a cooling system overhaul. The car is right at 100k miles, so this was an overdue PM. Drive belts were ready to shred, thermostat was in soft fail mode, and who knows what else was ready to go, expansion tank maybe.
xi cooling system overhaul (aluminum radiator, expansion tank, 1.4 bar tank cap, electric fan, thermostat) i've been thinking about overhauling the cooling system since a CCA DIY event earlier this year. What I did was take 2 bad/soft thermostats from the same car and a new replacement and spend a good part of the day testing and studying what and how the bad/soft thermostats reacted. The interesting thing I found is the thermostat all opened about the same amount when heated and none of them were "stuck" open.
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78C is too cool. That big of a variance you have is telling me that your thermostat IS soft failing. The job of the thermostat is to keep a steady operating temperature no matter what the ambient temperature is. It should really only fluctuate between 88C - 95C. And just because you changed your thermostat 2 years ago doesn't mean it's not bad. Ambient temperature of around 70F seems to be the tipping point for flagging a soft/failed thermostat that may cause and engine to run too cool. Above 70F ambient, the engine will likely warm up enough and in general the engine thermostat is not factored into the engine cooling too much once the engine hits and maintains its "nominal" operating . Sounds like you have a soft fail thermostat going on. I just had this on my X5. It should hold within 10C range (90C-100C) whether you are in traffic or traveling at 70 MPH on the highway. The DME does send a signal to the thermostat heater for additional cooling if you are giving it more generous throttle input so keep that in mind.
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I think the thermostat is stuck open as it takes a long time to warm up. Runs at 187 degrees farenheit when hot. Will fuel consumption possibly settle after resetting adaptions, or more related to soft failing thermostat. Getting around 14 - 15MPG Car is a 2001 325i Auto Sedan with 200K KMS Sorry in advance for my ramblings! lol Cheers. Thermostat: unplug the electrical connector at the thermostat, secure it safely behind the thermostat, and then drive the car again as normal and redo the logs. This removes the DME's ability to activate a heating element to lower coolant temps. What you are testing here is the mechanical function of the thermostat, which is (should be) rated . Car not getting up to temp, could be a soft failing thermostat. Normal coolant temps should be between 92c to 97c or so. Read the actual coolant temps with an app like OBD Fusion or use the hidden test menu to pull Test 7.0 on the dash to display the actual coolant temp. (See first link in my signature line.)
Soft-Failing electric engine fan. . Buy TOPAZ 17117561757 E46 Radiator Cooling Fan Assembly Replacement for BMW 3 Series 323i 325i 325xi 328i 330i 99-05: Fans - Amazon.com FREE DELIVERY possible on eligible purchases . this, expansion tank, thermostat, expansion tank bracket and starter. all genuine stuff. 8HP70Z Gearbox on E46 || . That's the first I have heard about an aluminum thermostat for the M54. The M50/M52 have a thermostat separate from the housing so an aluminum housing is a nice reliability upgrade. M54 thermostats are a 24 month interval item (in my experience) so the plastic does not age enough to fail like radiators do. I say skip it. A new Behr thermostat caused soft failing stat symptoms for me. Engine was warming up very slow at all ambient temperatures. I installed a Wahler and all is good now. I did check the Behr tstat and it was working fine. Seemed the spring in the thermostat was very weak compared to the one in the Wahler. (still needs to be established.) If indeed it is, things to look for are weak fan clutch (the primary cooling fan) and/or a soft failing thermostat housing. We've done dozens of thermostat housings. Almost always for a thermostat plausibility code. There's a rubber seal around the outer perimeter of the inside of the thermostat housing.
Give the system another bleed. If you keep the symptoms you described my money is on a bad or soft failing thermostat. When I did my cooling system I replaced the thermostat with a Behr. The car would only get to operating temp (about 97C) in slow traffic. Got a Wahler thermostat and compared it to the Behr before installing. E46 Forums. E46 General. Soft failing thermostat? Jump to Latest Follow 1K views 4 .
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The coolant thermostat must be 100%. If one has a soft failing (at/near threshold but NOT setting a Ck. Eng. light.) thermostat the engine does not reach the threshold temps, often holding back completion of the various O2 monitors. Verify first that the T/Stat is indeed reaching proper temperature.
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testing a soft failing thermostat e46|e46 thermostat bad signs