re. Car runs too cool/intermittant autocheck annoyances

Kneale Brownson kneale at
Sun Oct 23 10:23:10 EDT 2005

My 200q20v used to run with the gauge showing really low coolant
temperatures, even when the afterrun pump/fan circuit worked in hot
weather.  A year ago I replaced all the cooling system as well as all the
temperature sensors and thermostat when I did a TB.  Now it runs just above
the larger mark on the gauge regardless of outside temperatures.

At 09:45 AM 10/23/2005 -0400, Ben Swann wrote:
>I have 2 200Q20V's and both do the same thing with the cooling guage - 
>rarely goes out of the cool range - hardly can tell it moves from the 
>bottommost postition, but it does.  I believe I have seen the guage creep 
>toward the middle on some exceptionally hot driving conditions, but rarely 
>any significant deviation from the cold reading.  I don't know if this is 
>normal, a normal "failure", or perhaps something to do with the way they are 
>The brake warning can be aggravating and sometimes hard to resolve.  If the 
>wiring is good to the brake pad sensors and pads are new with good sensor 
>connection, I have found the ultimate resolution is to ground the wires 
>coming out of the autocheck control unit - located just above the glove 
>compartment.  Refer to the Bently wiring diagram to get the proper wires. 
>Only ground out the sensor wires otherwise you will disable the entire 
>autocheck system.
>The Temp warning indicator can be caused by several sensors, so consult the 
>diagram to find what is doing this.  Most commonly, a slightly low level in 
>the overflow reservior will cause the light to go on, often going up a hill 
>( or down - I forget).
>Regualar Q-list in copy as these tend to apply to earlier 200 models as 
>well. as others.
>[From: "Aaron Rosenstein" <admin at>
>Subject: Car runs too cool/intermittant autocheck annoyances
>To: <200q20v at>
><F2D05777E5774E43BC7093A8D63F2707D329 at orcas.donotspam.local>
>Content-Type: text/plain; charset="US-ASCII"
>After a 5 year break from Audis, I got the bug again and picked up anice 91 
>200tq from a local seller. The car is in amazing shape overall,and has less 
>miles than my last one, but still ahas a couple quirks.
>I'm concerned that the engine seems to runn so cool. Unless I'm driving 
>around town slowly, the temp needle never get off the bottom three lines, 
>and my last car always ran just under half even on teh freeway.
>At the same time, I get the annoying intermittant overheat/water symbol on 
>the autocheck box, and alternatively an oil and brack pad warning at odd 
>times. I don't know if either of the three are related, but they are all 
>false signals as the gauges (presumably) don't lie, and I have good oil 
>pressure and am not overheating.  Has anyone ever found a way to unplug the 
>autcheck systems without losing the radio display ability?
>Aaron Rosenstein
>91 200TQ
>Anacortes, WA] 
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