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Old 01-05-2017, 01:54 PM   #3361
Mr.Wilson
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how many sensors are attached to the cooling system? temp sensor and level sensor? so coolant light issues troubleshooting meanwhile temp sensor overheating behind my back?? not possible if the temp sensor reads anything?? as mine does sit at normal operating range but now new continuous light. just dont want her tellin lies to me while im tryna pick up the kids lol also heard that expansion tank issues cause light as well just in what manner? mounting? sensory? or just plain old clogged up?? help me Mango!!
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Old 01-05-2017, 02:53 PM   #3362
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The level sensor just lets you know if the coolant level is to low, just like the sensor in the washer tank. There are two temperature sensors, one in the head and one in the lower radiator hose. If the tank sender says it's low you need to check the level and if it's low find out where the leak is. Obviously if it's too low the temp can rise and possibly overheat.
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Old 01-05-2017, 02:56 PM   #3363
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I do not recommend "troubleshooting" the cooling system. If your light is on, it means you have low coolant. If you have low coolant, the most common cause by far is the expansion tank leaking. A system overheat isn't too far behind if you don't add coolant, assuming air was not and is not being introduced into the system. I recommend replacement of the entire cooling system. See my blog here: http://www.e46mango.com/2014/10/hi-t...6fanatics.html
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Old 01-05-2017, 06:09 PM   #3364
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Originally Posted by zapsix View Post
Yes! That's a good idea. Where can I purchase these items? (Coolant pipes. Hoses. Crank case vent valve, ccv, vacuum lines, starter?)


2004330iZHP
Not sure if you're tolling or not? In case you're not...punch in the last 7 digits of your VIN on realoem.com. Get the part numbers you need and use any online vendor you like. Also, if you're thinking about working on the car yourself, there are TONS of DIYs and posts on here for just about any problem you may encounter.

Good luck!
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Old 01-06-2017, 09:53 AM   #3365
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I do not recommend "troubleshooting" the cooling system. If your light is on, it means you have low coolant. If you have low coolant, the most common cause by far is the expansion tank leaking. A system overheat isn't too far behind if you don't add coolant, assuming air was not and is not being introduced into the system. I recommend replacement of the entire cooling system. See my blog here: http://www.e46mango.com/2014/10/hi-t...6fanatics.html


My coolant lights comes on when I go fast. But it only comes on once I slow down after hitting speed like 90. It's weird. I checked the coolant level and its right on the full mark.


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Old 01-06-2017, 11:15 AM   #3366
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My coolant lights comes on when I go fast.
Then, don't go fast
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Old 01-06-2017, 11:20 AM   #3367
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Lol


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Old 01-06-2017, 02:38 PM   #3368
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Did you try bleeding it correctly?
When was the system refurbished?

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Old 01-06-2017, 09:58 PM   #3369
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Running Cold?

Hey all: Have been studying this thread (and many others), I am 5 weeks into ownership of my sweet baby, 2004 325 vert. Driving it in "mostly" cold weather so far, I've noticed it runs on the cold side of the gauge. I plan to do a full cooling system refresh once its not so flippin cold out. On warmer days it will run with the gauge straight-up 12 oclock, but on cold days like today, it will stay at or near the blue. If idling (parked), it will rise closer to 12 noon,but when at speed (30-70 mph) it cools off to touching the blue area. I had a brief low coolant light on the first cold day I owned her, at startup, and I topped off the ET with the BMW coolant/distilled water 50/50 mix, and she's been perfect since. Just wondering, with the cold air temp, is this normal or is it a sign of a soft t-stat fail?

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Old 01-07-2017, 11:36 AM   #3370
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Hey all: Have been studying this thread (and many others), I am 5 weeks into ownership of my sweet baby, 2004 325 vert. Driving it in "mostly" cold weather so far, I've noticed it runs on the cold side of the gauge. I plan to do a full cooling system refresh once its not so flippin cold out. On warmer days it will run with the gauge straight-up 12 oclock, but on cold days like today, it will stay at or near the blue. If idling (parked), it will rise closer to 12 noon,but when at speed (30-70 mph) it cools off to touching the blue area. I had a brief low coolant light on the first cold day I owned her, at startup, and I topped off the ET with the BMW coolant/distilled water 50/50 mix, and she's been perfect since. Just wondering, with the cold air temp, is this normal or is it a sign of a soft t-stat fail?
I would suspect it's a soft thermostat failure. I don't know how cold it is where you live, but it's around low to mid 20s here in Seattle and my temperature gauge doesn't have a problem getting to middle. I would get that replaced sooner rather than later; it's not good to have your engine running below optimal temperature for extended periods of time.

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Old 01-07-2017, 11:52 AM   #3371
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I would suspect it's a soft thermostat failure. I don't know how cold it is where you live, but it's around low to mid 20s here in Seattle and my temperature gauge doesn't have a problem getting to middle. I would get that replaced sooner rather than later; it's not good to have your engine running below optimal temperature for extended periods of time.

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Thanks Big-K, yes I've been studying other threads on this subject and I agree. Interestingly, at least for now, I have no other cold-running symptoms (i.e. starting, mayo, etc.) I have a Coling Systme refresh kit on order from FCP Euro. Might as well do it all!
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Old 01-08-2017, 07:15 AM   #3372
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Sounds like you still have are in the heater core, check the level when its cold and if you need to add more coolant do it with the bleed screw out and the usual key on, heat on high fan on low. Watch for more bubbles out of the bleed screw. Hopefully the higher rpms will push the air out of the heater core and into the expansion tank.
I think the level has stabilised, today the coolant level was the same as the day before. It's really hot down here atm but i will try bleeding with the screw off again when it cools down
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Old 01-08-2017, 01:19 PM   #3373
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I think the level has stabilised, today the coolant level was the same as the day before. It's really hot down here atm but i will try bleeding with the screw off again when it cools down
I think you're done, if the level hasn't changed the air should be out. Check it regularly keeping in mind the warmer the ambient temp the higher the float will be. The levels on the float are for an optimum temp of 68F.
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Old 01-08-2017, 03:51 PM   #3374
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Sorry if i post in wrong thred but i am lost.i own an e46 318ci n46b20 and i do not know what antifreeze is suitable.in realoem it gives me 3 part numbers.also i do not know which the difference between green and blue antifreeze.can you help me please?

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Old 01-08-2017, 03:53 PM   #3375
Mbryant616
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Sorry if i post in wrong thred but i am lost.i own an e46 318ci n46b20 and i do not know what antifreeze is suitable.in realoem it gives me 3 part numbers.also i do not know which the difference between green and blue antifreeze.can you help me please?

***931;***964;***955;***952;***951;***954;***949; ***945;***960; ***964;***959; LG-D855 ***956;***959;***965; ***967;***961;***951;***963;***953;***956;***959;***960;***9 59;***953;***957;***964;***945;***962; Tapatalk
Don't know about specific part #'s but I bought genuine BMW coolant from my local dealer ($27 per gal) and distilled water from the local grocery. 50/50 mix.
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Old 01-08-2017, 03:54 PM   #3376
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What colour was that?

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Old 01-08-2017, 03:59 PM   #3377
alcarazdiego10
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There usually blue

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Old 01-08-2017, 04:06 PM   #3378
Mbryant616
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What colour was that?

***931;***964;***955;***952;***951;***954;***949; ***945;***960; ***964;***959; LG-D855 ***956;***959;***965; ***967;***961;***951;***963;***953;***956;***959;***960;***9 59;***953;***957;***964;***945;***962; Tapatalk
It's in a gray jug but the coolant is BLUE. This is what I have (but I purchase at my local stealership).http://www.bimmerworld.com/Fluids/Ge...sCIBoCjwrw_wcB

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Old 01-11-2017, 04:34 PM   #3379
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I can hear a slight chirping sound when first starting the car in the morning, seems to go away after. coolant level looks good and I haven't needed to put in anymore in today.

Is it really not recommended to open the bleed screw just a bit when it's warm/hot to lose the air?

Temp seems to go up to 98c (seen it at 99c for a sec) then goes down is this normal ?
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Old 01-11-2017, 04:34 PM   #3380
BMOne
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I can hear a slight chirping sound when first starting the car in the morning, seems to go away after. coolant level looks good and I haven't needed to put in anymore in today.

Is it really not recommended to open the bleed screw just a bit when it's warm/hot to lose the air?

Temp seems to go up to 98c (seen it at 99c for a sec) then goes down is this normal ?
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