Coolant Temp High - Car Overheated

[S6Express]

Yesterday my 2013 S6 overheated. Coolant temperature reach 250 degrees. I stopped and turned it off. Looked under the hood and I could see the coolant boiling in the reservoir. 10 minutes later I re-stared and drove home. This morning the car asked for more coolant, I added about 2 cups. It may have a leak or something blocked the entrance to the radiator.

Temps normal on the way to work this morning. Any clue?

[kouzman]

Stuck thermostat maybe?

[cooncified]

Agreed, most likely the thermostat. Had the issue with my 3.0T and its pretty common, first 4.0T I have heard it happening to though.

[ronbars]

Are you detecting any odor of escaping coolant? A few months ago I smelled coolant and discovered that one of the hoses that connects to the reservoir had split where it fits over the barbed end of the connector. It was leaking coolant onto the ABS unit, but there were no traces of a leak on the ground. I got the low coolant warning on the way to the dealer to get the hose replaced, but the car never overheated.

[S6Express]

Are you detecting any odor of escaping coolant? A few months ago I smelled coolant and discovered that one of the hoses that connects to the reservoir had split where it fits over the barbed end of the connector. It was leaking coolant onto the ABS unit, but there were no traces of a leak on the ground. I got the low coolant warning on the way to the dealer to get the hose replaced, but the car never overheated.

I did find a couple of ounces of coolant on my garage floor a couple of weeks ago. I monitored the floor ever since, but didn't see anymore, until yesterday's problem. It was missing a couple of cups, so there has to be some coolant coming out. I have an appt this afternoon.

[JayNana]

Thermos are usually designed to get stuck opened if at all, not closed aren't they?

Leaking hose or radiator stone damage maybe?


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[VVG]

Yesterday my 2013 S6 overheated. Coolant temperature reach 250 degrees. I stopped and turned it off. Looked under the hood and I could see the coolant boiling in the reservoir. 10 minutes later I re-stared and drove home. This morning the car asked for more coolant, I added about 2 cups. It may have a leak or something blocked the entrance to the radiator.

Temps normal on the way to work this morning. Any clue?

Audi is known for having coolant pump problems. Also, these motors run hot. Over time, coolant will burn and/or evaporate a little. If there is too little coolant, it will overheat. If you are at or near 30,000 miles, it might be time to change/flush the coolant. I was starting to smell coolant a short while ago. No leaks detected, but my coolant level was right below the MIN level in the tank. I actually sucked out about a quart of old coolant out of the reservoir, then refilled it with fresh coolant to the MAX. Problem solved. I may also try a product called Water Wetter by Redline which increases the heat carrying capacity of the coolant.

It seems that right around 30-35k, these cars need a big time service......

Oil change
Air filter
Coolant flush and change
Spark plugs
DSG fluid
brake fluid & possibly pads/rotors

Did I miss anything?

[MadAboutCars]

Thermostat was stuck open on the 2013 S6 I had on loan. Took forever to heat up and allow full revs. I've never heard of one stuck closed, but I guess it's possible.

It's not good for these engines to overheat, especially bad for the turbos. I wonder if it has any error codes that might give you a clue as to what's happening.

[S6Express]

Thermostat was stuck open on the 2013 S6 I had on loan. Took forever to heat up and allow full revs. I've never heard of one stuck closed, but I guess it's possible.

It's not good for these engines to overheat, especially bad for the turbos. I wonder if it has any error codes that might give you a clue as to what's happening.

Car is at the dealer. I'll post when I know what happened.

[S6Express]

Dealer says they ordered new coolant pipe per TSB. Problem is...I already had the coolant pipe TSB 2036167/1 performed in Sept 2014.

Is this a case of a dealer not really checking and just going by the TSB book?

[RRF985]

Dealer says they ordered new coolant pipe per TSB. Problem is...I already had the coolant pipe TSB 2036167/1 performed in Sept 2014.

Is this a case of a dealer not really checking and just going by the TSB book?

Kinda sounds like they aren't doing any investigating and throwing parts at it per the TSB. It's warranty work so that isn't surprising since it only pays so much. I would think that the service history would show the TSB previously completed though.

[MadAboutCars]

They probably have a better pipe now, that will last a lot longer. Last time they probably just fitted the same one.

[S6Express]

They probably have a better pipe now, that will last a lot longer. Last time they probably just fitted the same one.

I was very vaguely told that it was a different TSB....No new TSB number or explanation given.