Coolant Light Keep Coming On After Replacement of Sensor - BMW 3-Series Forum (F30 / F32)

legaleye3000 · 01-22-2013, 08:27 AM

I just had my car in the shop. They replaced the coolant tank that has the sensor on it. After testing, they said that the replacement was bad. Then they replaced it again and now my coolant light keeps coming on.

Any ideas?

shivj · 01-22-2013, 12:53 PM

Misunderstood, but the tank was replaced twice or the sensor was? When you turn the heat on does it get hot? Any issues with overheating at all?

legaleye3000 · 01-22-2013, 01:23 PM

They said they replaced the tank twice (during the same visit to the dealership; not to different visits). No overheating issues... I haven't turned the heat on since I'm in south FL and need the a/c

shivj · 01-22-2013, 01:41 PM

Ah my mistake, missed the location. Well if cooling system is functioning properly, perhaps there is some sort of a short on the sensor lead. Sorry I can't be of more help. Still getting used to how nearly every aspect of these cars is computer controlled. Another trip to the dealer perhaps? Best of luck!

legaleye3000 · 01-22-2013, 01:42 PM

If a sensor is replaced, is a sensor lead also replaced? Thanks!

shivj · 01-22-2013, 01:57 PM

Not entirely sure on bmw's, but on my s2000 the same lead would be reused and just the sensor at the end replaced. Looking at the previous generation 3 series it is similar, so I imagine the F30 would be as well. However, I have seen that a few people with F30's have had faulty coolant sensors, which were of course replaced by the dealer. That's the only thing that pops into my head regarding the light coming on

Hilbe · 02-02-2013, 03:22 PM

What color is your coolant? Service repulaced it and now the temperature goes up.

Now the coolant is blue but i think it was pink when i got the car

Robz_328i · 02-02-2013, 07:52 PM

By the way a question like this, I live in montreal canada which is pretty cold. Do someone experience this but it takes about 10mins for the car heat to get hot? Sorry i was driving a volvo before and it became hot pretty quick. My 328i seems to take time though but might be normal ???

Robz_328i · 02-02-2013, 07:53 PM

+ my coolant did came up too. However when i went to bmw, they added some more and it eventually did better than before. Never saw the smg again.

legaleye3000 · 02-02-2013, 09:51 PM

I found out that the dealership didn't secure the hose that connects the tank to the engine so a couple hours later it fell off of the tank and all the coolant spilled out causing my car to overheat!

01-22-2013, 08:27 AM	#1
legaleye3000 Private First Class Drives: BMW 328i Sedan 2012 Join Date: Sep 2012 Location: South FL Posts: 151 iTrader: (0)	Coolant Light Keep Coming On After Replacement of Sensor I just had my car in the shop. They replaced the coolant tank that has the sensor on it. After testing, they said that the replacement was bad. Then they replaced it again and now my coolant light keeps coming on. Any ideas?
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01-22-2013, 12:53 PM	#2
shivj New Member Drives: 2012 F30 Join Date: Jan 2013 Location: WNY Posts: 14 iTrader: (0)	Misunderstood, but the tank was replaced twice or the sensor was? When you turn the heat on does it get hot? Any issues with overheating at all?

01-22-2013, 01:23 PM	#3
legaleye3000 Private First Class Drives: BMW 328i Sedan 2012 Join Date: Sep 2012 Location: South FL Posts: 151 iTrader: (0)	They said they replaced the tank twice (during the same visit to the dealership; not to different visits). No overheating issues... I haven't turned the heat on since I'm in south FL and need the a/c

01-22-2013, 01:41 PM	#4
shivj New Member Drives: 2012 F30 Join Date: Jan 2013 Location: WNY Posts: 14 iTrader: (0)	Ah my mistake, missed the location. Well if cooling system is functioning properly, perhaps there is some sort of a short on the sensor lead. Sorry I can't be of more help. Still getting used to how nearly every aspect of these cars is computer controlled. Another trip to the dealer perhaps? Best of luck!

01-22-2013, 01:42 PM	#5
legaleye3000 Private First Class Drives: BMW 328i Sedan 2012 Join Date: Sep 2012 Location: South FL Posts: 151 iTrader: (0)	If a sensor is replaced, is a sensor lead also replaced? Thanks!

01-22-2013, 01:57 PM	#6
shivj New Member Drives: 2012 F30 Join Date: Jan 2013 Location: WNY Posts: 14 iTrader: (0)	Not entirely sure on bmw's, but on my s2000 the same lead would be reused and just the sensor at the end replaced. Looking at the previous generation 3 series it is similar, so I imagine the F30 would be as well. However, I have seen that a few people with F30's have had faulty coolant sensors, which were of course replaced by the dealer. That's the only thing that pops into my head regarding the light coming on

02-02-2013, 03:22 PM	#7
Hilbe New Member Drives: F30 320 2013 Join Date: Dec 2012 Location: Mexico Posts: 6 iTrader: (0)	What color is your coolant? Service repulaced it and now the temperature goes up. Now the coolant is blue but i think it was pink when i got the car

02-02-2013, 07:52 PM	#8
Robz_328i Enlisted Member Drives: Bmw 328i 2012 Luxury Executive Join Date: Aug 2012 Location: Montreal Posts: 32 iTrader: (0)	By the way a question like this, I live in montreal canada which is pretty cold. Do someone experience this but it takes about 10mins for the car heat to get hot? Sorry i was driving a volvo before and it became hot pretty quick. My 328i seems to take time though but might be normal ???

02-02-2013, 07:53 PM	#9
Robz_328i Enlisted Member Drives: Bmw 328i 2012 Luxury Executive Join Date: Aug 2012 Location: Montreal Posts: 32 iTrader: (0)	+ my coolant did came up too. However when i went to bmw, they added some more and it eventually did better than before. Never saw the smg again.

02-02-2013, 09:51 PM	#10
legaleye3000 Private First Class Drives: BMW 328i Sedan 2012 Join Date: Sep 2012 Location: South FL Posts: 151 iTrader: (0)	I found out that the dealership didn't secure the hose that connects the tank to the engine so a couple hours later it fell off of the tank and all the coolant spilled out causing my car to overheat!