HI @dragline1570,Photos numbered in logical order of parts replacement of repair coolant leaking in valley from vacuum control valve.
Of course this is just a overview don't attempt this unless you have a good tool kit and back your skills.
There are so many things inside the engine 'vee' that could leak! Originally, my part cover 059 103 525 f had cracked. Along with replacing it, I also replaced the coolant valve, the gaskets (under the oil cooler, the oil cooler plate, the water line into the EGR), and the flange supplying water to the EGR.HI @dragline1570,
I just completed the repair this afternoon but noticed that after 20 minutes of driving, the coolant has sunk to way below the minimum line again.
I had a look in the valley and it looks like there might be a small build up of coolant still below the new vacuum flange. Is this normal? I'm not sure if the coolant build up is from me not cleaning up the valley completely or if it's a new leak. Kind of worried as it was a lot of work to replace lol!
Any advice would be appreciated. Cheers
For anyone who reads this thread and has the same coolant leak filling the valley of the engine and also running down the front of the engine beside the coolant pump don't look at the EGR cooler as the issue!!
It is the vacuum controlled coolant valve leaking that is mounted under the EGR valve behind the oil cooler under the HP pump.
I know that sound somewhat confusing but having repaired 3 of these in the last month (2 x Q7's and 1 x Touareg) i am sure i have figured it out.
VW even updated the coolant valve as the old unit leaks from the shaft that turns the internal valve.
I have photos if any interest and part numbers.
regards
Drag
PN: 059115185CI have a '14 TDI and have confirmed that there's a coolant leak from the oil cooler thermostat plug which is located just below the water pump pulley. I think the o-ring is done. I cannot find the part numbers for the plug and/or the o-ring (2 and 3 in the left photo) to save my life. Does anyone have these numbers? I would really appreciate it! Right photo below courtesy of dragline1570.
View attachment 248081 View attachment 248082
I appreciate that part number! I think it might be oil (not coolant) seeping slowly from that cover. Maybe I got confused after reading post #36. But, in addition to that leak, I also have a slow coolant leak inside the V of the engine. I'm just trying to eliminate this easier-to-fix leak before I tear into the top of the engine and replace all gaskets and plastic parts.PN: 059115185C
There shouldn’t be a coolant leak coming from the oil thermostat though..?
Yep I’m in the the same boat. Small coolant leak in the V and still have a leak out the oil thermostat. Slow enough I’ve been living with it but need to get in there and swap in a new one.I appreciate that part number! I think it might be oil (not coolant) seeping slowly from that cover. Maybe I got confused after reading post #36. But, in addition to that leak, I also have a slow coolant leak inside the V of the engine. I'm just trying to eliminate this easier-to-fix leak before I tear into the top of the engine and replace all gaskets and plastic parts.
Hi. Could I have more info on this please. It is happening to my 2013 Audi A6 3.0 tdi Quattro. Loads of coolant in the valley. Replaced water pump already. No loss when idling but take it on a run and it empties out slowlyFor anyone who reads this thread and has the same coolant leak filling the valley of the engine and also running down the front of the engine beside the coolant pump don't look at the EGR cooler as the issue!!
It is the vacuum controlled coolant valve leaking that is mounted under the EGR valve behind the oil cooler under the HP pump.
I know that sound somewhat confusing but having repaired 3 of these in the last month (2 x Q7's and 1 x Touareg) i am sure i have figured it out.
VW even updated the coolant valve as the old unit leaks from the shaft that turns the internal valve.
I have photos if any interest and part numbers.
regards
Drag
I did this job 2 times. After first replace, it started to leak again. Then I decided to try different approach. All seals replaced again, but this time I also used glue for oil pans. It is called Reinzosil and reliable up to 300°C. Dont forget to change valve (#059121737AM) which also responsible for G12 coolant leak.Hi. Could I have more info on this please. It is happening to my 2013 Audi A6 3.0 tdi Quattro. Loads of coolant in the valley. Replaced water pump already. No loss when idling but take it on a run and it empties out slowly
If you don't mind me asking, how much did this set you back? I'm considering doing the repair myself.I just brought my 2013 Q7 TDI (124,500 miles) into the dealer for coolant and oil in the valley. Oil leak was so bad at times that it looked like a bomb of oil exploded inside the engine compartment and even at times on the garage floor. Low coolant light every 5k miles or so but never any on the floor; only the smell of burnt off coolant. They replaced everything that is talked about in this thread and even did the oil cooler and the EGR cooler (they said the EGR cooler was leaking and found it after putting it all back together). All was covered under the extended TDI warranty (4 years/48000 miles). They said the needed oil change wasn't covered so I had to pay for that only. View attachment 248616
You dont need nothing special. Just regular wrenches for fuel pipes. Then hex and torx for EGR and cooler. Well there is one thing...you need torque wrench, to make sure that u will not damage seals. I did with oil change, because G12 could mess the oil.I've got a 2012 Q7 3.0L V6 which I've had less than 1 year, I've been topping the coolant a lot lately and have noticed a pool of brown water in underneath the intake. It has a small oil leak I've also had overheating problems and lost the heat inside the car. It's a high milage car at 170k, so some problems were expected.
I'm considering doing the job myself and stripping it down, I'm a plant/access fitter by trade so have plenty of tools and experience on diesel engines, but was wondering if anyone who's done this job themselves could give a rundown of all the required tools and equipment for this job to be completed at home.
Thanks in advance.