Low coolant temps after changing thermostat

dilyanyordanov · 01-19-2017, 02:16 PM

So,I 've search through the forum but it seems everyone is getting high temperatures instead of low. Two weeks ago I had to pick someone up. It was snowing and cold,the heat started but after driving with about 50mph it was getting colder. I waited for my friend for 5 mins and the car got hotter to about 80-85C. I started driving and coolant temp got lower. I called my mechanic and we both thought it was the thermostat...He changed it alongside some other things but not related to coolant system. He used 50% coolant and 50% water. Told me to check the coolant level in the morning(i got my car tonight from him). I started driving and turned the hidden menu on because I wanted to check if the car will get warm faster. It didn't. It is still below -2,-4C degrees.I drove for around 15 miles but at most I got 75C. I parked in front of my house and waited for about 10-15 mins and it got up to 100-105C. I shut off the car and asked my mechanic why it took so long to warm up but he wasn't sure. So did anyone experience such a thing...I got the heat on when I am usually above 60-65C(that's what I've noticed) but it is really hot after 70-80C. He said the thermostat should be working perfectly. Is there anything else my mechanic and I didn't notice ? Any suggestions ? He told me to drive tomorrow and see if everything is ok and if it is still not ok to take the car back. Funny thing is my work is about 4 miles from home,so i am pretty confident, it won't get warm in 4 miles.

Jeff@TopGearSolutions · 01-19-2017, 02:18 PM

How many miles on the water pump?

dilyanyordanov · 01-19-2017, 02:21 PM

Not sure...I got the car 3 months ago and it had 146 000kms...Now it is at 149000....I've never changed it.Not sure if the previous owners have done it.

bradsm87 · 01-19-2017, 02:49 PM

Check for DME fault codes. I had the same symptoms when the thermo fan wasn't plugged in. The DME forces a low coolant temp target, which it can acheive at speed but not when stopped.

dilyanyordanov · 01-19-2017, 03:08 PM

How did you fix it ?

bradsm87 · 01-19-2017, 09:11 PM

Quote:

Originally Posted by dilyanyordanov

How did you fix it ?

The thermo fan was not plugged all the way back in after mechanical work. I plugged it back in and it was fixed.

You need to read DME codes to know what's going on in your case.

nikitino25 · 01-21-2017, 01:50 AM

How do you get that hidden coolant temp menu if you don't have i- drive?

dilyanyordanov · 01-21-2017, 10:10 AM

Could it be the coolant temp sensor ?

01-19-2017, 02:16 PM	#1
dilyanyordanov New Member 3 Rep 15 Posts Drives: 09 335i JB4, VRSF DPs Join Date: Oct 2016 Location: Europe iTrader: (0)	Low coolant temps after changing thermostat So,I 've search through the forum but it seems everyone is getting high temperatures instead of low. Two weeks ago I had to pick someone up. It was snowing and cold,the heat started but after driving with about 50mph it was getting colder. I waited for my friend for 5 mins and the car got hotter to about 80-85C. I started driving and coolant temp got lower. I called my mechanic and we both thought it was the thermostat...He changed it alongside some other things but not related to coolant system. He used 50% coolant and 50% water. Told me to check the coolant level in the morning(i got my car tonight from him). I started driving and turned the hidden menu on because I wanted to check if the car will get warm faster. It didn't. It is still below -2,-4C degrees.I drove for around 15 miles but at most I got 75C. I parked in front of my house and waited for about 10-15 mins and it got up to 100-105C. I shut off the car and asked my mechanic why it took so long to warm up but he wasn't sure. So did anyone experience such a thing...I got the heat on when I am usually above 60-65C(that's what I've noticed) but it is really hot after 70-80C. He said the thermostat should be working perfectly. Is there anything else my mechanic and I didn't notice ? Any suggestions ? He told me to drive tomorrow and see if everything is ok and if it is still not ok to take the car back. Funny thing is my work is about 4 miles from home,so i am pretty confident, it won't get warm in 4 miles.
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01-19-2017, 02:18 PM	#2
Jeff@TopGearSolutions 3441 Rep 79,212 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	How many miles on the water pump?
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01-19-2017, 02:21 PM	#3
dilyanyordanov New Member 3 Rep 15 Posts Drives: 09 335i JB4, VRSF DPs Join Date: Oct 2016 Location: Europe iTrader: (0)	Not sure...I got the car 3 months ago and it had 146 000kms...Now it is at 149000....I've never changed it.Not sure if the previous owners have done it.
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01-19-2017, 02:49 PM	#4
bradsm87 Lieutenant Colonel 595 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	Check for DME fault codes. I had the same symptoms when the thermo fan wasn't plugged in. The DME forces a low coolant temp target, which it can acheive at speed but not when stopped.
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01-19-2017, 03:08 PM	#5
dilyanyordanov New Member 3 Rep 15 Posts Drives: 09 335i JB4, VRSF DPs Join Date: Oct 2016 Location: Europe iTrader: (0)	How did you fix it ?
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01-21-2017, 01:50 AM	#7
nikitino25 Captain 91 Rep 817 Posts Drives: '07 E92 335i Join Date: Dec 2011 Location: Missouri iTrader: (2)	How do you get that hidden coolant temp menu if you don't have i- drive?
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01-21-2017, 10:10 AM	#8
dilyanyordanov New Member 3 Rep 15 Posts Drives: 09 335i JB4, VRSF DPs Join Date: Oct 2016 Location: Europe iTrader: (0)	Could it be the coolant temp sensor ?
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