Yesterday while driving home, I was smelling the smell of coolant in the vehicle, so I did the KTMP test and saw that my car was running warmer than usual at 108-112C (Usually my car runs at about 103 C since I changed the thermostat). When I got home, I opened the hood and saw that the BLEEDER screw was off of the coolant tank, and the coolant was bubbling out of the tank and all over the place. So this morning, the bleeder screw was replaced, and an attempt to bleed the system was done. The temperature fluctuated from 112* C to 99C then to 103C then to 105C. Now when I drive the vehicle the temperatures are creeping around 106-110C. Could this still be trapped air or something more serious?
The standard running temperature with a stock thermostat is 108-110*C
'98 740il | 9/97 build | schwarz 2 | sandbeige | 5AT | 270k
'04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 120k
'00 540i sport | Titanium silver | Black | 5AT | 152k
'85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 216k | one owner, all original
mods: m-pars | Bilsteins & B&G springs | ValentineOne | StealthOne
retrofits: full nav | MKIV | bluetooth TCU | BM53 w/ AUX input | video module w/ AV input & backup cam | oem sirius xm | xenon | shades | PDC | rain sensor | BMW DWS TPMS | lighted door handles | front seat heaters | heated steering wheel | euro rear fog lights | ski pass | folding mirrors
I changed to the 90c thermostat and my temperature would top out at 103C.
Is that the thermostat from Logic7Amps?
I bought one of those also and it didn't go a year before my car started running at 107. Contacted him and he suggested there was something wrong with my cooling system. Nope.
He offered for me to buy another and get a refund when I return the defective one, but he was out of prefacelift tstats. Even though he was going to order one and let me know, I never heard from him and gave up.
I should make an update post on here that it doesn't last long.
Last edited by racer2086; 07-11-2018 at 09:17 PM.
'98 740il | 9/97 build | schwarz 2 | sandbeige | 5AT | 270k
'04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 120k
'00 540i sport | Titanium silver | Black | 5AT | 152k
'85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 216k | one owner, all original
mods: m-pars | Bilsteins & B&G springs | ValentineOne | StealthOne
retrofits: full nav | MKIV | bluetooth TCU | BM53 w/ AUX input | video module w/ AV input & backup cam | oem sirius xm | xenon | shades | PDC | rain sensor | BMW DWS TPMS | lighted door handles | front seat heaters | heated steering wheel | euro rear fog lights | ski pass | folding mirrors
Try bleeding it some more on a cold engine... I jabe an oem tstat and it runs 106-110 max...
Sent from my SM-N910T3 using Tapatalk
Last edited by purplecty; 07-12-2018 at 05:03 PM.
With the coolant system closed, are you losing coolant? If you run the car in the driveway for about 15 minutes with the coolant cap off, does it boil over? If that happens, you may be looking at a HG failure.
02 e39 540i Sport (Son), 01 DINAN 7 (Me), 12 e70 X5 x35i (Mrs), 95 e34 525i (Daughter 2), 01 e46 325Ci vert (Daughter 1)
I extensively bled the system, I guess air was trapped somewhere, but that seems to have remedied the issue as I have consistent KTMP temperatures around to 99-103. Thank you all for the insight
What thermostat do you have to give you those temperatures?
'98 740il | 9/97 build | schwarz 2 | sandbeige | 5AT | 270k
'04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 120k
'00 540i sport | Titanium silver | Black | 5AT | 152k
'85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 216k | one owner, all original
mods: m-pars | Bilsteins & B&G springs | ValentineOne | StealthOne
retrofits: full nav | MKIV | bluetooth TCU | BM53 w/ AUX input | video module w/ AV input & backup cam | oem sirius xm | xenon | shades | PDC | rain sensor | BMW DWS TPMS | lighted door handles | front seat heaters | heated steering wheel | euro rear fog lights | ski pass | folding mirrors
https://www.ecstuning.com/b-vemo-par...512248542~vmo/
Sent from my VS995 using Tapatalk
Here is the one that I have.
https://www.ebay.com/itm/BMW-OEM-90C...sid=m570.l1313
Yes, I have that one also. I'm considering it a loss of money over just an OEM one. Mine runs 99-107*C like almost nothing changed. I emailed the guy and he has been little help. Basically blamed my cooling system, which is all new.
To the forum: DON'T WASTE YOUR MONEY ON IT. I've read various E39 threads where they were able to heat the t-stat spring and lower the temp down to 98*C. I'm going to try that on this one next and see if I can lower the temps myself.
'98 740il | 9/97 build | schwarz 2 | sandbeige | 5AT | 270k
'04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 120k
'00 540i sport | Titanium silver | Black | 5AT | 152k
'85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 216k | one owner, all original
mods: m-pars | Bilsteins & B&G springs | ValentineOne | StealthOne
retrofits: full nav | MKIV | bluetooth TCU | BM53 w/ AUX input | video module w/ AV input & backup cam | oem sirius xm | xenon | shades | PDC | rain sensor | BMW DWS TPMS | lighted door handles | front seat heaters | heated steering wheel | euro rear fog lights | ski pass | folding mirrors
When I first got it, it sat around 99-100. I emailed the guy and was like WTF, it is not 90*C. I get that it may run a little hotter, but c'mon, t-stats should run about at their rated temperature. Anyway a pile of garbage I say and you have to be persistent with the emails to get any info from the guy.
'98 740il | 9/97 build | schwarz 2 | sandbeige | 5AT | 270k
'04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 120k
'00 540i sport | Titanium silver | Black | 5AT | 152k
'85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 216k | one owner, all original
mods: m-pars | Bilsteins & B&G springs | ValentineOne | StealthOne
retrofits: full nav | MKIV | bluetooth TCU | BM53 w/ AUX input | video module w/ AV input & backup cam | oem sirius xm | xenon | shades | PDC | rain sensor | BMW DWS TPMS | lighted door handles | front seat heaters | heated steering wheel | euro rear fog lights | ski pass | folding mirrors
I got the mechanical 88c tstat and am yet to install it...
Sent from my SM-N910T3 using Tapatalk
Bookmarks