95a90

This morning, I took cknyoc's advice, let the car warm up without cap on the overflow tank, and I monitored the coolant level change during 1 hr period

I need people to monitor their overflow tank activity and compare it to mine, so I can get a good diagnosis of my problem.

1. the coolant level drop within a min when I first start the engine (meaning coolant flows into engine when it's just started)

but I notice poor flow of coolant from engine into the overflow tank (it just drip, little by little, intermittenly, with air between drips, back to the overflow tank)



2. in half hour, the engine heat up (temp gauge point to the middle), the radiator fan starts for min then stop(according to temp, if the gauge goes a little bit more than the mid point the fan will start, and when it cools down, the fan stops) and coolant start to back up into the overflow tank, which is very strange to me, coz I think "COOLANT SHOULD GO INTO THE ENGINE WHEN IT'S HOTTER"

3. AFTER 1 HOUR AND AFTER I DROVE AROUND A LITTLE BIT, MORE COOLANT BACK UP INTO THE OVERFLOW TANK, AND THE FAN NOW RUNS CONTINUOUSLY,

4. WHEN I SHUT OFF THE ENGINE, A LOT OF COOLANTS BACK UP INTO THE OVERFLOW TANK, SOME OF IT EVAPORATES OUT, THEN, AFTER ABOUT 5 MIN, THE ENGINE COOL DOWN A BIT, THE COOLANT LEVEL IN THE OVERFLOW TANK DROPS AGAIN TO MID POINT BTW MAX AND MIN, (MEANING THE COOLANT FLOW BACK TO THE ENGINE WHEN IT'S COLD)

I REALLY DON'T GET IT. UNLESS SOMEONE IN THIS GROUP SEE THE SAME TYPE OF THING IN THEIR CAR, i THINK SOMETHING IS SERIOUSLY WRONG WITH MY COOLING SYSTEM.

HOW CAN THE COOLANT BACK OUT OF THE ENGINE WHEN IT'S HOT?

I am suspecting that the mechanic put the thermostat upside down, or there's been a very improper bleeding procedure when they change my water pump,

THE MECHANIC IN THE SHOP SAYS MY FAN SHOULD BE ON MORE OFTEN, HE SUSPECT MY FAN IS NOT DOING ITS JOB, BUT MY FAN HAS BEEN ON MORE OFTEN AFTER HE DID THE JOB (BECOZ OF THE INCREASE IN TEMP), AND HE SAID MY AIR CONDITIONER COMPRESSOR IS NOT TURNING, WHICH COZ A LOT OF HEAT?

i DON'T KNOW MAN

MASTERS OF AUDIS, PLEASE HELP!

MM120

Something's definately wrong. I've never seen that before, but you may be right about the t-stat being in wrong. That would be my best guess, but I'm not the best w/ cooling systems. Call a good radiator shop & explain to them. HTH

MikTip

the coolant level should not drop! ;O)

The Audi 12V V6 does not "self-bleed" air from its system!

Its a master at trapping air! ;O)

MikTip

First, properly bleed the air from the system! ;O)

rtking

That's in the hose leading past the battery and into the fire wall. (This goes to your heater core.) Unclamp the hose and pull back until you see the hole in the hose line-up with a hole in the pipe it's attached to. Fill your overflow bottle to completely full, then put the cap on it. Then start the car and turn your heater on to FULL. Let the car idle. The car will be forced to push out any air through that bleeder hole. You'll lose coolant through that hole too, so be careful you don't burn yourself. When you're sure there's no more air (no more steam coming from the hole and only coolant), use a rag to grab the hose and push it all the way back onto the heater core tubing. Then use some pliers and put the clamp back on.

Let us know how that works out for you.

Bob

95a90

They said they fixed my hi-temp situation. They claimed that my fan won't turn on when the car is in 2nd gear and now they make sure the fan will be on when the car travel in low speed?

Man, I just hope they didn't cut and rewire my fan in some way.

That shop has 1 good mechanic that does the engine and tranny (and nothing else), and 5 idiots that can't do any maintenance properly. It's 1 of the 5 idiots that does the cooling system flushing, and depite my repetitive plead to the boss to let the engine guy to bleed my cooling system, the boss insist it's not air in the cooling system.

I saw the idiot refill my overflow tank beyond max in an attempt to COOL MY SYSTEM TODAY. HOW MANY TIME DO I HAVE TO DRAIN THE EXCESS COOLANT TO PREVENT THE MASS VAPORIZATION OF IT FROM UNDER MY HOOD. F-UP MORONS!~~~~~~~~~~~~~!

95a90

there's always another garage, I really had enough of the 5 idiots.

rtking

when the A/C isn't on. I think it's triggered at 195*F and shuts off at 205*F. And then there's the high speed fan that kicks-in when either 1)temp is above 205*F, or 2) your A/C is on.

The fan speed has nothing to do with whether you're 2nd gear (or 3rd, 4th, 5th, reverse or even 1st gears.)

I'd find a competent Audi mechanic in your area to look at your car. The last thing you want is to have them bypass the fan controller and wire the fan to run all the time.

Bob

rtking

If that doesn't work, THEN take it to another mechanic. Try to contact your local Quattro Club USA chapter and find out who they recommend as a mechanic in your area.

Bob

MikTip

<center><img src="http://pictureposter.audiworld.com/6607/coolpic.jpg"></center><p>
The Audi V6 has 2 bleed ports(pic).

The one nearest the heater core, bleeds air from the heater core.

The second, nearer the engine, most difficult to find, bleeds air from the engine. This one is the most important one to bleed! Because you can completly bleed air from the heater core line, and still have air in the engine!

The Audi V6 does not have a "heater core valve" as older Audi's had, to allow coolant into the core. Hot coolant is constantly running through the heater core on the V6.

The Audi V6 is notorious for trapping air! It does not "self-bleed" air from its system!

Why did Audi place two air bleeder valves, if the engine self bleeds air? ;O)