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2012 A6 Coolant Temperature Too High!

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Old 05-13-2014, 04:41 PM   #1
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Default 2012 A6 Coolant Temperature Too High!

Hi
I have a 2012 A6 Prestige with 62k on it. After about 20 minutes of driving or less depending on outside temp and ac usage, the car over heats and I receive "coolant temperature too high" as a message. I of course turn the car off and let it sit and cool down. I took the car to get serviced and was told there was an air pocket in the coolant system which they say was low. I drove the car for another 20 minutes or less and received the same issue. Has anyone ever had this issue before? I don't see any leaks or signs of water, the engine doesn't even seem to be really hot. I'm wondering if it may be a sensor error, or is it really that the water pump and thermostat need changed. Any help would be greatly appreciated. Thanks so much....
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Old 05-13-2014, 05:00 PM   #2
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Lots of thermostat failures. Some water pump failures as well.
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Old 05-13-2014, 05:12 PM   #3
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Hi
I have a 2012 A6 Prestige with 62k on it. After about 20 minutes of driving or less depending on outside temp and ac usage, the car over heats and I receive "coolant temperature too high" as a message. I of course turn the car off and let it sit and cool down. I took the car to get serviced and was told there was an air pocket in the coolant system which they say was low. I drove the car for another 20 minutes or less and received the same issue. Has anyone ever had this issue before? I don't see any leaks or signs of water, the engine doesn't even seem to be really hot. I'm wondering if it may be a sensor error, or is it really that the water pump and thermostat need changed. Any help would be greatly appreciated. Thanks so much....
This is the C5 forum have you tried the C6 forums?, although I do agree that CTS sensors do fail.
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Old 05-13-2014, 05:21 PM   #4
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This is the C5 forum have you tried the C6 forums?, although I do agree that CTS sensors do fail.
The 2012 A6 is a C7 platform. There have been several reported thermostat failures with the 3.0L TFSI engine. Some shops replace the water pump too.

http://forums.audiworld.com/showthread.php?t=2858298
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Last edited by tenspeed; 05-13-2014 at 05:25 PM.
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Old 05-13-2014, 05:59 PM   #5
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Lots of thermostat failures. Some water pump failures as well.
Thank you so much, I appreciate it.
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Old 05-13-2014, 06:01 PM   #6
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Thank you so much, I am VERY new to this. I'm just desperate for help. I appreciate your assistance.
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Old 05-14-2014, 04:51 PM   #7
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The 2012 A6 is a C7 platform. There have been several reported thermostat failures with the 3.0L TFSI engine. Some shops replace the water pump too.

http://forums.audiworld.com/showthread.php?t=2858298
Very informative indeed, but this is the C5 forum.
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Old 05-15-2014, 03:55 AM   #8
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Lots of thermostat failures. Some water pump failures as well.
Agreed. It's more likely a thermostat failed closed. If I were king all thermostats would fail open…at least you could drive the car. Unsane audi engineers.
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Old 05-15-2014, 03:56 AM   #9
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Lots of thermostat failures. Some water pump failures as well.
Probably end up pulling the w/p anyway to get to the thermostat..investigate w/p at that time.
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Old 05-16-2014, 09:44 AM   #10
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Make sure the secondary coolant fan is working, too. Mine did this only when I turned the A/C on, turns out the electric fan had croaked.
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Old 05-16-2014, 09:51 AM   #11
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Make sure the secondary coolant fan is working, too. Mine did this only when I turned the A/C on, turns out the electric fan had croaked.
On a C5 or C7?
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Old 05-19-2014, 04:02 AM   #12
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Make sure the secondary coolant fan is working, too. Mine did this only when I turned the A/C on, turns out the electric fan had croaked.
Thank you, good point, I will make sure to mention this as well if the issue still occurs. I am praying that it does not, not being able to drive my car hurts my feelings. Lol Thank you so much for your reply. :-)
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Old 05-20-2014, 04:25 AM   #13
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If i were king the thermostat would be in the radiator hose, accessible with a screwdriver or small butter knife :-)

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Old 05-20-2014, 10:43 AM   #14
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If i were king the thermostat would be in the radiator hose, accessible with a screwdriver or small butter knife :-)

Grant
.. and the heater core would be in a panel you could just lift out of the dash ...
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Old 05-24-2014, 08:37 AM   #15
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Hey guys. I just got my water pump replaced for the over heating issue today. FYI, the "thermostat" and the "water pump" is one in the same. They are replaced as one unit.
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Old 05-24-2014, 10:00 AM   #16
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On a C5 or C7?
Sorry-mine happened on a C5, don't know how a C7 is set up. For all I know it has a viscous fan and two electric ones...
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Old 05-27-2014, 04:24 AM   #17
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Hey guys. I just got my water pump replaced for the over heating issue today. FYI, the "thermostat" and the "water pump" is one in the same. They are replaced as one unit.
Hi,
Was this an expensive fix? Mine is sadly out of warranty range. ;-(
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Old 05-27-2014, 06:24 AM   #18
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Hey guys. I just got my water pump replaced for the over heating issue today. FYI, the "thermostat" and the "water pump" is one in the same. They are replaced as one unit.
Just for Clarification . The Water pump and thermostat are not " one in the same" They are completely different parts with different functions and different part numbers. I Think what is confusing you is that they are often changed together as they are such a PITA to get to and both deal with cooling.

They can be changed independantly . ( i had to change my stat as i had an infant failure on mine when i did my timing belt job, but i sure as hell didnt replace the water pump again ...

BTW did it fix your problem and were you able to identify which component failed ?
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Old 05-27-2014, 06:26 AM   #19
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Hi,
Was this an expensive fix? Mine is sadly out of warranty range. ;-(
Usually it is quite expensive as you would do the timing belt at the same time. A dealer will allmost certainly take you to the cleaners. But some independants can be reasonable. Some let you even source your own parts, but if it were me i wouldn't. Let them source them and get warranty on the whole job. How many miles on your car ? and has it had a timing belt done ?
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Old 05-27-2014, 07:17 AM   #20
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Hi,
Was this an expensive fix? Mine is sadly out of warranty range. ;-(
You guys need to move this discussion to the correct forum. This forum is for C5 body style cars. If your car is 2005 or newer, you are on the wrong forum.
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