You probably have a leak in your oil cooler. This is causing the oil to bleed into your cooling system causing the "thick brown liquid". This in turn will also cause your engine to over-heat since the cooling system is contaminated.
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Did you bleed your system of air???....usually a bleed screw near the thermostat housing...get allllll the air out...simetimes the heater core is at the highest oart if the system..therefore if there is air in system..thats where the air settles and no coolant will flow through the heater cire!!
that is dexcool coolant in its broken down state--caused by bad preventive maint. or excessive introduction of oxygen (leak)--flush,flush,flush that stuff out with thermostat removed--refill & pressure test--prepare to repair coolant leaks & overheats the rest of its life---everthing is deteoriting inside out
Unfortunate you're losing coolant into the cylinders, where it's being burned off and exiting out the exhaust. When you initially added that cold coolant into the hot radiator, and hot engine (sit down) you likely cracked the engine block. Best case you just need to replace the head gasket.
Hi there:the Audi manual never talks about a 2 stage aux fan just that the aux fan runs with ac on and it can run with out ac on if there is an overheat issue on the coolant side where as the a4 info clearly states a 2 stage aux fan system that would lead me to think the early 4.2 did not use a 2 stage system. Your car is not overheating and boiling over out of the coolant tank it is showing a little hotter than what would be perfect but it is still in what Audi calls acceptable range. The whole coolant system is new I would start looking at your sensor and gage systems there is a coolant sensor in the rad but that is most likely new if they replaced the rad. The gage uses a temp sensor on the engine for the gage I would replace that sensor and test the gage with a resistance input tool we have at the dealer. Could be a gouge or the wiring to it. There is a coolant fan module that could be defective if your sure there was a two speeds to the aux fan.
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Before you flush it, check to make sure your oil doesn't have coolant in it. From your description of your coolant, sounds like there's oil in it.. which is indication of a head gasket leak. Have it pressured tested first before doing your flush. Coolant shouldn't be "brown & thick"
MAKE SURE YOUR COOLANT STAYED FULL. YOU MIGHT HAVE CREATED AN AIR BUBBLE IN SYSTEM. CHECK LEVEL AGAIN. IF THAT CAR HAS A SERPENTINE BELT MAKE SURE ITS ROUTED CORRECTLY ,AS IT MAY ALSO RUN THE WATER PUMP.
About the only liquid that passes through the passenger compartment is coolant through the heater core so that item may have developed a leak.
If it is brown, the coolant may be way overdue for a flush and a change.
You might sniff the liquid to see if you find any trace of coolant odor.