Coolant Leak Through Wiring Harness
12-29-2014, 11:52 AM
#21
AudiWorld Member
Thanks, so the plot thickens, in elsawin it gives a picture and a description but doesn't indicate where they are, the other strange thing is that it gives the same picture for each valve. Does anyone have an indication where to look as I think I will have to borrow a lift and do it myself.
12-29-2014, 01:46 PM
#22
AudiWorld Super User
You need to remove the front 'belly pan' and it should be on the lower part of the back of the radiator from what I can tell.
But... I only have the gasoline manuals...
But... I only have the gasoline manuals...
12-30-2014, 09:24 AM
#23
AudiWorld Member
Thanks again, well I've managed to find the 2 valves that do not exist! They are behind the intercooler / in front of the wheel arch cover on the left side of the car, as you say you need to remove the belly pan first.
Both plugs disconnected to check and fortunately no coolant in the plugs, it does amaze me that they said it didn't have them especially as I know they had the belly pan off, the "technician" like a lot I have seen seemed to have an allergy to installing it correctly.
Both plugs disconnected to check and fortunately no coolant in the plugs, it does amaze me that they said it didn't have them especially as I know they had the belly pan off, the "technician" like a lot I have seen seemed to have an allergy to installing it correctly.
12-30-2014, 06:19 PM
#24
Coolant in the Wiring Harness. as well...
I have a 2011 A8 with 35k miles. Last week the check engine light came on the the car shut down. I had it towed to my dealer and the diagnosis was that a coolant valve had failed causing the coolant to leach through(inside the wire itself)the wiring and shorted out the ECU. A friend who had an independent repair shop told me this was a 'known issue' as the coolant valve was prone to failing.
Has anyone ever heard of this happening before?
Has anyone ever heard of this happening before?
My EPC warning light and Engine Light were on. The issue was found to be coolant in the same wiring harness. The repair order follows:
MIL on. Found faults for the transmission fluid cooler valves circuit open. Found the TSB # 2033806/6 for this issue. Removed the connector at the transmission fluid cooler valve and found coolant damage at the terminals. Followed the TSB and searched for other signs of damage ion electrical connectors, found the engine control module to have coolant ingress damage. Also several terminals were damaged at the connector T90. Also found the cowl panel was deformed from the engine control module heating up from the short inside of the module. Coded, adapted and cleared all faults. Repaired the 4 damaged terminals at the T90 connector to the ECM. Performed a harness overlay for the transmission fluid cooler valve. Reinstalled all components and replaced the deformed cowl panel. Test drove. Complete.
4HO-907-560-C Control Unit
4HO-121-670-A Valve
assorted wires, tie wrap, connector, wire harness
I cannot provide information as to cost nor labor hours since this was written up as N/C. I hope this may help anyone else in the future as this seems to be a common problem. Oh, btw only 24k miles on the 2011 as I'm mostly on one of my Harley's as weather permits here in the Frozen Tundra of New England...
12-31-2014, 12:00 AM
#26
AudiWorld Member
Thanks again, well I've managed to find the 2 valves that do not exist! They are behind the intercooler / in front of the wheel arch cover on the left side of the car, as you say you need to remove the belly pan first.
Both plugs disconnected to check and fortunately no coolant in the plugs, it does amaze me that they said it didn't have them especially as I know they had the belly pan off, the "technician" like a lot I have seen seemed to have an allergy to installing it correctly.
Both plugs disconnected to check and fortunately no coolant in the plugs, it does amaze me that they said it didn't have them especially as I know they had the belly pan off, the "technician" like a lot I have seen seemed to have an allergy to installing it correctly.
12-31-2014, 04:43 AM
#28
AudiWorld Super User
Dr. H, I do believe your SA and the Service Manager each deserve a bottle of champagne (Veuve Clicquot,at the very least) to help ring in the New Year. 😉. Glad to hear your dealer came through for you on this---does make for a positive end to 2014.
12-31-2014, 09:54 AM
#29
AudiWorld Member
I would have to agree on buying them a drink, this is how it should be. I guess you could have argued that the coolant would have been seeping for some time. Good for them though, they have kept a customer.
11-15-2015, 10:29 AM
#30
AudiWorld Member
This issue is sort of bugging me and I've tried to get the Audi guys where I live to change the valves just to be sure, they act as they do not know what I am talking about and simply don't respond in a way that makes me want to leave my car with them for this.
Still don't want to get stuck on the highway and was thinking if there was a simple way (quick diy) to keep the wiring harness and ECU healthy even if the valves started to leak.
An idea would be to simply fit a short cable extension, that should potentially keep the original connector and cable healthy assuming coolant won't pass through the second connector.
Anyone know if that might work and how to get the right cable extension?
Still don't want to get stuck on the highway and was thinking if there was a simple way (quick diy) to keep the wiring harness and ECU healthy even if the valves started to leak.
An idea would be to simply fit a short cable extension, that should potentially keep the original connector and cable healthy assuming coolant won't pass through the second connector.
Anyone know if that might work and how to get the right cable extension?