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Old 11-17-2010, 01:10 AM   #1
motion
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Coolant LIGHT ON??!?!?

hey guys got a question about this annoying problem I am having with my sisters car.


Its a 2002 Bmw 320i.
When the car is running the coolant light would come on randomly and then go away randomly and i cant seem to figure out why.

i checked the coolant level and all is well.

any ideas boys?
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Old 11-17-2010, 01:17 AM   #2
propr'one
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check the sensor wiring.
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Old 11-17-2010, 08:09 AM   #3
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Quote:
Originally Posted by motion View Post
hey guys got a question about this annoying problem I am having with my sisters car.


Its a 2002 Bmw 320i.
When the car is running the coolant light would come on randomly and then go away randomly and i cant seem to figure out why.

i checked the coolant level and all is well.

any ideas boys?
check the plug wiring at the sensor. Could be loose or cracked.
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2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 11-17-2010, 12:25 PM   #4
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Quote:
Originally Posted by trueblood View Post
it's all in the wiring. what a pain in the ass. I feel bad for you
You feel bad for someone who has a problem which can pretty much be ignored with no ill effects? I should tell you about my cars.
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Old 11-18-2010, 04:13 AM   #5
motion
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You feel bad for someone who has a problem which can pretty much be ignored with no ill effects? I should tell you about my cars.
LOL.

hey hey hey i still want it fixed just incase i am one day with no coolant and there goes the motor....
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Old 11-27-2010, 04:54 PM   #6
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dont worry if u have no coolant yur temp will go up and you'll know it.
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Old 12-03-2010, 11:00 PM   #7
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Your system is not bled properly and you are actually low on coolant !

I had identical problem. Problem is when the car is cold it will show full on the stick in the ET and when the car warms up the coolant light would come on, indicating you are low. When the car cools down so you can check the level, it would shop full, am I right?

Its because of when your thermostat opens it will drain your expansion tank if the system is not bled properly and if its not actually full and you will get a low coolant light on the dash, BUT when it closes > the light will go away.

This is why I ALWAYS tell people to bleed their cooling system when the car is on, because you need the thermo to cycle.
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Old 01-21-2011, 07:02 PM   #8
GTA_G20
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Im having the opposite problem. My coolant light comes on at initial startup and goes away after 1 minute
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Old 01-21-2011, 07:08 PM   #9
Ceeker
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that's really not a problem. The dme is taking a bit to get the signal from the sensor. Change your sensor. it may be a bit slow..lol remember it's pretty cold outside.
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 01-22-2011, 05:06 AM   #10
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Quote:
Originally Posted by Blocked_Out View Post
Your system is not bled properly and you are actually low on coolant !

I had identical problem. Problem is when the car is cold it will show full on the stick in the ET and when the car warms up the coolant light would come on, indicating you are low. When the car cools down so you can check the level, it would shop full, am I right?

Its because of when your thermostat opens it will drain your expansion tank if the system is not bled properly and if its not actually full and you will get a low coolant light on the dash, BUT when it closes > the light will go away.

This is why I ALWAYS tell people to bleed their cooling system when the car is on, because you need the thermo to cycle.
How do u bleed it while its on? Turn the car on let it fully warm up with no coolant and then start pouring it in with bleeder screw open?
I'v done it multiple times on my 05 with the car off and never had coolant issues.. level was always right and no flashing cooling lights
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Old 01-22-2011, 06:45 AM   #11
crxgsr
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Originally Posted by GTA_G20 View Post
Im having the opposite problem. My coolant light comes on at initial startup and goes away after 1 minute
You need to add coolant. Once the car is running, the temperature rises and the coolant expands, so seems like there is more and the light goes off. Once it cools down, the level goes back down.
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