1999 AUDI A6 SAI continues to short out due to fresh water. Audi mechanics can not find cause

Question edited for clarity.
Question moved from COOKING category. It got lost for 10 years!

Audi A6 / S6 (C5/4B; 1997-2004) fuses and relays

Fuse Box Diagrams https://fuse-box.info > audi > audi-a6-s6-c5-4b-1997-...

Fuse box diagrams (location and assignment of electrical fuses and relays) Audi A6 / S6 / RS6 (C5/4B; 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004).

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1999 Audi A6 Quattro 2.8 V6 engine

THIS IS AS IT SHOULD BE,the temp should rise after about 1 to 2 miles,VW group engines have very little water in them compared to some other makes and should get to "operating temp" far quicker than most other cars.as long as your not overheating/overcooling,your gas mileage will be at its optimum.

the pulley tentioner on the power steering belt, i ve done lots of them, they are self tentioning and over time can cause to much tention on the belt, if this the case when you have the steering at full lock it should squeal the loudest.

With the year difference only being two years apart I would go with the lower mileage vehicle.But remember that just because it's lower mileage doesn't mean it's in better shape mechanically.A quick trip to your trusted auto mechanic and a small charge of $25 per car can get you a prepurchase inspection, which will tell you any problems the vehicle might have, aka oil/fluid leaks, etc.I hope I could help.....get back to me with any questions

find a SPECIALIZED Audi mechanic with his own / family business ( NOOOO DEALERS !!!!!!) which may give 3 references - customers. After that, the only thing you should care would be the regular oil service. Splendid car, mine drove like a dream until the dealership f****d its engine.

sound like a speaker wire is grounding out somehow

Either charge or replace your battery or check for any faulty wires that could have been damaged by the excess loss of power if it was due to a short circuit.

look under car on water pump housing, the thermostat is on a metal housing that looks like an igloo and has to bolts perhaps 10mm or 13mm, and an "O" ring in between

It's a complicated job, and usually takes about 8 hours to do the full service if you're familiar with the car's mechanicals, you have a good array of tools (air tools help a lot), you're familiar with what you're doing, and with how to disassemble everything (including removing the front of the car - I'm not joking). There's more to the job than just the belt too - you need to replace the timing belt, timing tensioner, water pump, thermostat, serpentine belt, and serpentine tensioner. If your cam seals are leaking (which is also known to happen), you'd need those and plan for a couple more hours as well, due to the care that must be taken not to scratch or score the cam end caps.