Hi everyone, I have the usual coolant leak from somewhere on my 2013 q7 3.0 tdi.

It doesn't seem to lose it when just running around on short journeys , but on a 50 mile trip or something like that it loses some coolant. The car runs absolutely fine and at the correct temperature.

Has anyone else has this type of symptom?

If so ,what was the fix?

Everything I read online is say about looking in the v for coolant but you can't seem to see anything as it's so tightly packed in there, the only place I've seen coolant is down the right side of the waterpump as you look at it dripping down slightly, the car was facing slightly down hill and leaning that way. I have also noticed the pump has a broken bolt on it so will taking it of to remove that aswell. So not sure if it's coming from that, but it doesn't look like it. Thanks 👍

On 6/27/2026 at 7:43 PM, cjcchris said:

Hi everyone, I have the usual coolant leak from somewhere on my 2013 q7 3.0 tdi.

It doesn't seem to lose it when just running around on short journeys , but on a 50 mile trip or something like that it loses some coolant. The car runs absolutely fine and at the correct temperature.

Has anyone else has this type of symptom?

If so ,what was the fix?

Everything I read online is say about looking in the v for coolant but you can't seem to see anything as it's so tightly packed in there, the only place I've seen coolant is down the right side of the waterpump as you look at it dripping down slightly, the car was facing slightly down hill and leaning that way. I have also noticed the pump has a broken bolt on it so will taking it of to remove that aswell. So not sure if it's coming from that, but it doesn't look like it. Thanks 👍

Hi I think you have solved it yourself as a broken bolt won't maintain uniform pressure on the gasket therefore water will escape.

Steve.

Thanks Steve, having had more of a closer look it does look like I also have coolant inside the v. So now need to find out what is leaking in there .

44 minutes ago, cjcchris said:

Thanks Steve, having had more of a closer look it does look like I also have coolant inside the v. So now need to find out what is leaking in there .

Hi probably the oil cooler, not a nice job.

Steve.

No it doesn't in look like a nice job, yes it could be that, I think it might be a good idea to also change the other plastic parts in the coolant system down there

3 minutes ago, cjcchris said:

No it doesn't in look like a nice job, yes it could be that, I think it might be a good idea to also change the other plastic parts in the coolant system down there

Loads of stripping down therefore it would be wise to replace everything down there, you won't want to do it twice, also you will need to adhere to any torque settings for bolts.

Steve.

Yeah I will just change everything, from what I can see it look like it might be coming from the plastic flange bit that connects to the egr cooler, I think there is another plastic piece behind that aswell (back towards the inside of the car ) but not sure what that's called