overheating

Originally Posted by gaby1088

The nature of the situation does not suggest it is a mechanical issue. From one second to the next it reads it's overheating. Then he turns off the car and it reads cold again. What sensors could it be?

if you replace the entire cooling system as you say, then it would not be a sensor.

did you replace the fan switch? (sensor)

Originally Posted by gaby1088

The nature of the situation does not suggest it is a mechanical issue. From one second to the next it reads it's overheating. Then he turns off the car and it reads cold again. What sensors could it be?

Intermittent overheating can also be, and will be caused by air bubbles.

Originally Posted by E46Mango

if you replace the entire cooling system as you say, then it would not be a sensor.

did you replace the fan switch? (sensor)

No sensors, just radiator, hoses, reservoir tank, water pump.



Just strange that it reads as if it is overheating. Unless the car can actually overheat in 1 second and cool off as soon as he turns it off lol

Originally Posted by gaby1088

No sensors, just radiator, hoses, reservoir tank, water pump.



Just strange that it reads as if it is overheating. Unless the car can actually overheat in 1 second and cool off as soon as he turns it off lol

That isn't the whole system. Not even close.

Back to post #2.

Sounds like air in the system. The process for properly bleeding the system has been discussed so I won't repeat it. The temperature sensor that goes into the lower radiator hose could also be flakey and need replacement. Good luck with resolving this issue.

ty for the step by step i did that last night and i just checked it was way low plunger was all the way down ???? what the **** could it be air bubble maybe i need to re bleed it again i just added 50 50 mix and ran it for half hour it never went past the normal runing temp

Originally Posted by majestic69

ty for the step by step i did that last night and i just checked it was way low plunger was all the way down ???? what the **** could it be air bubble maybe i need to re bleed it again i just added 50 50 mix and ran it for half hour it never went past the normal runing temp

No problem
Good, keep an eye on it....just don't go doing any runs up Teton pass just yet.

Sent from my SAMSUNG-SGH-I727 using Bimmer App

k ty so much MPR77

Where in Wyoming are you? Wyoming is brutal for german cars. Ask me how I know.

ur prob in wy lol how do u know

I was in Wyoming last year. Absolutely hated it. I mean I love the people and culture. But the weather is brutal. I hit the oil pan of V8 Passat twice-- second time catastrophically. Water on my shoes entered the accelerator pedal and froze in there, completely destroying the TPS. I was in Laramie, BTW.

Originally Posted by scarede46er

Where in Wyoming are you? Wyoming is brutal for german cars. Ask me how I know.

I lived in Alma, CO (South Park)

10,5xx feet elevation. Highest Municipality in the US
I Used to have to park facing South in the winter to keep snowdrifts from piling in through the kidneys.
Blankets over the engine on really cold nights. Etc...

Average Annual temperature 43°F

My X3 6MT m54b30 was fantastic in the brutal winter.
It was brand new, but if your car is well maintained it will hold up fine.

My Bavarian Grandmother told me it does get kinda cold in the mother land as well, so these cars are built for cold.

Originally Posted by ///MPR77

I lived in Alma, CO (South Park)

10,5xx feet elevation. Highest Municipality in the US
I Used to have to park facing South in the winter to keep snowdrifts from piling in through the kidneys.
Blankets over the engine on really cold nights. Etc...

Average Annual temperature 43°F

My X3 6MT m54b30 was fantastic in the brutal winter.
It was brand new, but if your car is well maintained it will hold up fine.

My Bavarian Grandmother told me it does get kinda cold in the mother land as well, so these cars are built for cold.

Don't envy you. I am glad I am in the south now. Same kinda people. WAY better roads and weather.

ya here u got to be real careful how u drive. The roads are total **** and car is super low. Below zero out here lately

I usually love driving. I hated it there, with the narrow interstate and wind that blows you across lanes. Comically the speed limit was 80. Ya right.

haha thats no **** by time u cut through the wind ur going way slower then 80

Originally Posted by scarede46er

Don't envy you. I am glad I am in the south now. Same kinda people. WAY better roads and weather.

I lived in the south too,Kennesaw, Georgia...went to high school there nearly 20 yrs ago.
In Los Angeles now, because work.

Originally Posted by majestic69

haha thats no **** by time u cut through the wind ur going way slower then 80

Yep Hence those huge snowdrift barriers on the I-80

ya i bet dam

So did bleeding fix this?? My car is doing the exact same thing. Sure doesn't seem like an actual temperature issue. The gauge spikes high right from the blue mark, then as soon as you cycle the key it drops right back down to where it was before the spike.

I have already checked my coolant level and it is perfect. And this problem only started happening since it got cold here(below -20C)

I said from the beginning to just replace the temperature sensor/fan switch. It's like $15. Just try it.

Whenever instrumentation acts funny it's got to be either the battery or a sensor...rarely is it the actual dial gauge.