Sharpy64

What is annoying is that I cannot replicate the condition when stationary, but I did have the temperature showing on the infotainment screen on one of the trips and it never waivered from 90degs.

The biggest saving grace for me is I do all the work myself, I cannot imagine the cost of doing all of this at a garage, spent 3 hrs diagnosing alone yesterday. I intend to document the process I went through and hopefully the solution once its resolved to hopefully help others, although there seems to be so many similar issues around cooling systems!

Thats a fair shout, its is sounding a little "gritty". Thanks.

Its got 3 pumps, one mechanical (but with the electric shroud), that one is brand new and appears to be functioning as expected, there is an electric one that feeds the egr cooler I think and you can hear that one running and the final electric one is under the oil filter housing and that one makes no noise at all, so leaning towards that one being an issue.

So I spent some time at my mates tonight and got it on the lift, no leaks externally. However the main radiator is not getting hot and the pipes for that also remain cool. There is coolant in the pipes but it’s not getting circulated. We’re going to test the front electric water pumps but I melted my code reader in two and my mates is form 1960 I think, so he’s going to bring one back form his work (he’s a mechanic) so we can see if that’s working. Also suspect a possible issue with the thermostat, so making progress but more questions than answers. Going to replace the charge air cooler and thermostat anyway and then see where we get to. I’m not driving it anymore until I get a resolution though. At this rate I might as well replace the engine and be done with it lol.

Hi All, I know this is a topic that seems to have been covered a million times but my vRS has become a problem child. It was losing a small amount of coolant and I would get the odd whisp of steam from the back, I diagnosed a leaking EGR Cooler (confirmed with off car pressure test) and a small water pump leak. I replaced both and thought my work here was done. However it now seems to have made losses worse, this time from the reservoir, so yesterday I did a 90 min motorway drive and by the time I got to my destination the coolant warning light was on and there was no coolant in the tank. I had concerns the tank was on its way out and popped out and bought a pattern part from NAPA (I have already ordered an OEM one but I am waiting for it to arrive), fitted the NAPA part with new cap and thought my work was complete (again). On the way home, despite topping it up before I left, I only made it about 75mins before the warning light came on and, you guessed it, no coolant in the tank. I have been doing some diag work at home before I get it to my mates where we can get it on a lift and so far this is what I have noted, No smell of combustion gasses in the coolant tank No Milky residue in the oil No oil in the coolant No steam from the exhaust Lots of coolant around the expansion tank, wheel arch liner, subframe and pooling on the ground. Checked for hot air in the cabin and can confirm its really very hot I am going to pressure test the system and isolate the charge air cooler and pressure test that, but wondering if the hive mind has any other ideas about what might be going on, I have searched and read what feels like most of the forums around this topic and I struggling to get my head around what it might be. Thanks.

From what I understand it is all linked to the fuelling and the EGR system, so DPF as well as noted above. Not entirely sure how it all ties in but helping with regen of the DPF makes sense.

Its probably the back pressure control valve, I just found mine has one (2015 vRS TDi) and it wasn't plugged in, since plugged it in and the cars running much better now... which is probably not a surprise.

Appreciate this is a slightly aged thread but this fix has worked a treat for me, I resoldered the dry joints added a jumper and hey presto interior lights that work as expected. 👍

Came that way, they need doing again as there’s quite a few scuffs so will like get them done a darker colour. Funnily enough I check the oil weekly, force of habit, and had top it up. That said it’s not gone done much since then to wondering if it was a shade low after it was served pre sale. Will continue to monitor. Not used the VAG system but used my Icarsoft system to check and it seems okay, I’m going to plug it in to another system this week so can check again.

Thanks! I had spotted it, hoping it doesn’t become a project but then again I know it probably will…

Hi, Registered a little while back as I was looking for a vRS, finally found one I liked and took the plunge. It has a few things to sort out but I enjoy fettling with cars so that’s all good. A few pics for you delectation.