eljay Posted March 14, 2022 Share Posted March 14, 2022 Hello I'm doing this for my son who is not car-savvy. He's bought this 2003 Quattro TDI that is losing slight/irksome ammount of coolant. (It's too late now to reject it) No obvious leaks or puddles. He's had it looked at by supposed "Audi experts" ....no answer" He tried a Rold "sniffer" tester (to test for cylinder gases in coolant-Head Gasket Failure) ..... It did NOT change colour ....so negative on Head-Gasket failure. I'm thinking..... (1) Possible EGR Cooler??? (2) Through phone-video (at normal engine temp) I could see nearside rad-fan running ....but offside fan stationary....Is this normal??? (3) The car is aged and cheap ..... should he just add some radweld? (4)Would that fix an EGR cooler-issue? (5)Any other ideas???? HUGE THANKS Len Quote Link to comment Share on other sites More sharing options...
Steve Q Posted March 15, 2022 Share Posted March 15, 2022 I know you've done the head gasket test but is there any white smoke coming from the exhaust? Also it might be worth getting a diagnostic check carried out to see what fault codes flag up. Egr coolers are a common failure on VAG cars. I'd advise a good quality replacement as cheap ones can fail quite quickly Quote Link to comment Share on other sites More sharing options...
eljay Posted March 15, 2022 Author Share Posted March 15, 2022 (edited) Thanks Steve, I've asked my son about white smoke & he wasn't clear..... I'll ask again. He has a basic code reader so I'll ask him to do a scan. The only EGR-valve I've touched (Mondeo) had no cooler so I don't get how one could leak? But.... (1)Might Radweld fix it? (2)Is the only-one-fan-turning correct for normal temp? I mean what is the stationary off-side fan? Extreme Temp? Oil-Cooler? Many Thanks again Edited March 15, 2022 by eljay Quote Link to comment Share on other sites More sharing options...
Steve Q Posted March 15, 2022 Share Posted March 15, 2022 Definitely worth checking for the smoke. That's great, as any fault codes my help rule out potential causes. I believe all VAG cars have an egr cooler with the egr. I've found this link, I appreciate it doesn't relate to your specific engine but it gives good info on egrs. On reading it, it could just be a gasket leaking. I do feel you could try rad seal but if it did work then irl would only be a temporary repair. https://www.vwaudiforum.co.uk/forum/showthread.php/196553-2012-A6-quattro-3-0Tdi-EGR-coolant-leak-advice Quote Link to comment Share on other sites More sharing options...
eljay Posted March 16, 2022 Author Share Posted March 16, 2022 Thanks Steve, Any thoughts on the only-one-fan turning question? Quote Link to comment Share on other sites More sharing options...
Steve Q Posted March 16, 2022 Share Posted March 16, 2022 Honestly I'm not sure, but I imagine both should work if you've got 2 fitted. If it's not working it could be down to a failed sensor or broken wire maybe? Quote Link to comment Share on other sites More sharing options...
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