Rob.S4

snapped some shots of the coolant left in there as i was able to siphon some out ..i just hope its not worse than it is..<< paranoid :? >>

complacentsee

Ohhh, that does look differant than just old coolent. The tanks look really nasty though after time regardless of coolent.

Rob.S4

after much time working on this issue i used a hose to flush out the rest of the crap and use the coolant temp sensor hole as a drain...i turned the car on for a min while letting the hose water run through....and it got clear...

put the sensor that popped off originally

then i added 3 liters of G12 then 3 Liters of water and now i have a weird noise coming from the engine and then when i turn the heat an added sound comes on only when i go to turn on the air...

its been a long day with this stuff so any last pointers on why this noise is happening

ps.

i added the g12 first then the water is that incorrect?

complacentsee

Sound is probabaly air in the heater core or something. Turn on the heat and run the engine a little higher revs than usual and it should go away.

Rob.S4

after letting it idle for a bit and taking it for a spin i guess i burped the s4 and seems to be running smooth..

thank all who have helped with this task and i have def learned much from this.

heads up for others

Audi s4 2.7 use 3 liters of g12 with 3 liters of distilled or deionized water..

this link also came in handy:
http://phjeer.us/~heathy/cooling.pdf