Great.ĪUDI Cooling System Bypass Line Adapter. Cost estimate is $1800, since apparently most of the top of the engine is going to be removed (Valley parts). I have service scheduled on Tuesday.ĭuring the call with my service advisor I told him about the part Drag is talking about, and he said they have a Q7 in right now getting that part replaced, for the same (mysterious) coolant leak. Looks like it might have started to take out the front engine flange gasket: 059103161AJ, I can see oil leaks from both sides of the engine. Well look like my coolant problem has just turned into an oil leak problem. DPF filter blockage/failure, Catalytic Converter poisoning, turbocharger failure? I would be pissed if this caused some damage not diagnosed now, and later out of warranty "became" an issue. Extended platinum warranty in force, $100 deductible, thank goodness.ġ) Would a coolant system pressure test reveal a leaking EGR valve?Ģ) Any other possible areas where losing 1 quart over 6 weeks could go unnoticed, water pump, etc, anywhere? As I said before, NO visible leaks on the garage floor so I think it's heading out the tailpipe.ģ) IF it is the EGR valve, could this also cause other possible problems "down the line". I'll be calling the dealership tomorrow, to take it in for diagnostics. I was chalking it up to the cold mornings and water vapor but now I think it's a bit of coolant blowing out the exhaust. I HAVE NOTICED in the last few weeks on cold mornings during acceleration I see a large white cloud on occasion. I see no oil contamination in the reservoir, so it's not likely to be a head gasket. Reading the thread makes me think it's an EGR unit leaking coolant into the exhaust. They did change out one glow plug, no reason given, during the emissions repair. The last 10K was in November, and I was into the service area in early December for the emissions-compliant repair. Now that this is the SECOND 1-quart fill in exactly 6 weeks, I am bothered. I had NEVER had an issue in almost 5 years, so I thought MAYBE evaporation? Although with the 10K dealer performed service intervals, I always expected that they would catch and fill coolant if needed. ![]() I looked for a leak under the Touareg, but nothing. ![]() The first time it happened on a late December Saturday morning, I drove to VW dealership and bought $27 gallon of coolant. First engine start of the day, backing out of garage, and light came on. I also had the identical same thing happen. This was the SECOND time since late December 2017. I could clearly see the sensor electrodes. I was backing up out of garage, low coolant warning came on the display, and yes, sure enough, the reservoir was low. I had to add one quart of coolant to the reservoir this weekend.
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