|
Xoutpost server transfer and maintenance is occurring.... |
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management |
|
LinkBack | Thread Tools | Display Modes |
#101
|
|||
|
|||
__________________
2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim. |
Sponsored Links | |
|
#102
|
|||
|
|||
I ordered the main thermostat from AutohausAZ and the transmission cooler thermostat with GetBMWParts. AutohausAZ doesn't carry the transmission cooler thermostat. I will check the temps today more thoroughly as yesterday after the wife came home I checked the temp and it never went up above 72 and played between 68 and maxed out at 72.
Has anyone had this thermostat fail the opposite way (completely shut)? This seems to be the issues we deal with in the gas engines. I have had a number of cars have this issue but never running colder than spec. |
#103
|
|||
|
|||
Most modern thermostats go soft and run too cold. The main springs get weak over time, sometimes in less than 2 years.
Get OBDFusion for your phone/tablet and the proper interface (usually less than $20) and you can easily monitor AND Log the temps and other values.
__________________
2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim. |
#104
|
||||
|
||||
Quote:
|
#105
|
|||
|
|||
Quote:
My question was, are there folks who have had issues with a closed thermostat that leads to overheating? |
#106
|
|||
|
|||
I finally got to monitor the coolant temperature in the X5 this morning. The run to wife's office with the AC on at 16 deg C outside temperature never went above 72 deg C.
On my way to my office, I turned off the AC and the highest the temp got was while I was idling for a few minutes at a stoplight. It went up to 84 deg C but went down after the stop light and settled at around 72 deg C on the freeway. With my wife driving, it never left 72 deg and would go back and forth between 68 to 72. So definitely needing a thermostat replacement. It's a good thing, I have placed the order for the two thermostats. |
#107
|
|||
|
|||
Quote:
As for thermostats stuck closed, it rarely happens based on the design. Most overheating problems these days are due to low coolant/coolant leaks. Low coolant can cause the thermostat to not open due to no warm coolant for the thermostat to react to.
__________________
2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim. Last edited by jfoj; 11-01-2015 at 09:15 AM. |
#108
|
|||
|
|||
Finally got around to replacing the thermostats. I followed the advise here and replaced both the radiator and oil cooler thermostats. After going around 3 miles the temperature now reads 87 degrees.
|
#109
|
|||
|
|||
I'm wondering what the consensus is on what exactly constitutes a 'bad' thermostat. I monitored the coolant temps on my wife's X5 while towing a trailer in a mix of city and highway driving, with outdoor temps at 40F. The temps were pretty consistent between 79 -82C...certainly not as low as some here are experiencing. I have a new thermostat on the way and I'll probably install it anyway just to get ahead of when the original unit does eventually fail, but I'm almost thinking that it might be OK for now.
|
#110
|
|||
|
|||
You are getting to 82 because you are towing. The only time I got there was when I turned off the AC which turns off the fan (until it needs it) and I ws idling for a couple of minutes at a stop light. After which it went back to 72.
As mentioned in previous posts, if the thermostat doesn't keep the temp at 88 or so degrees, the glow plugs turn on to keep it at that temperature and the DPF does not regenerate. If this continues, the glow plugs will eventually burn itself out and the DPF will clog. The worst issue with a thermostat is if fails at the closed position making the car overheat. This was the question, I was asking earlier, Has anyone had a thermostat fail in the closed position and having overheated the motor? Either way, both issues require attention. |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|
|