Coolant leak with no overheating

DOOMAI

MEMBER
2010 AUDI A5
1.2L
4 CYL
TURBO
4WD
MANUAL
150,000 MILES

My car is leaking coolant, but it's not overheating. There is no steam when I open the hood after driving. After resting overnight, when I first start the car, it makes a gurgling noise, with what sounds like the coolant draining at the same time. The reservoir needs to be filled every day or two, but I can't find where the leak is coming from. I figured it's the radiator, but it's dry when I check, though I haven't checked from under the car when starting it.

Any ideas where I should be looking out what the cause might be?

3 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

The first thing to do is look under the vehicle to see if you can notice any coolant on the ground leaking. Second, I would suggest performing a cooling system pressure test. It is basically a pump that pressurizes the system with the engine off and cold to see where leaks are coming from. Auto parts stores have a tool loaner program and can rent you one. Here is a tutorial showing what is involved:

https://www.2carpros.com/articles/radiator-pressure-test

Once you perform this if you can make a video with your cell phone of the leaks and we will help with giving you repair advice and guides. Hope this helps and thanks for using 2CarPros.

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Sunday, January 3rd, 2021 AT 8:39 PM

DOOMAI

MEMBER
2 POSTS

Sorry, I forgot to mention that I took it in to get checked out and the mechanic did the pressure test and said that he couldn't find any leaks. I see coolant on the ground and one the plastic undercarriage cover every morning. I hear the leaking and gurgling at least every other day if not everyday. I have to add water to the reservoir just as often.

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Sunday, January 3rd, 2021 AT 8:45 PM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

If you see coolant on the ground it is definitely leaking from somewhere. Like I stated in my last post you need to perform a pressure test. You can do this with the car off and engine cold to prevent burns from crawling around the engine to located said leak. With the system being pressurized you will see where the leak is coming from. Hope this helps and thanks again for using 2CarPros.

Danny-

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Sunday, January 3rd, 2021 AT 9:44 PM

Coolant leak with no overheating

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