TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

My T started overheating today??? 180Q with GIAC Chip

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Old Aug 25, 2002 | 09:58 PM
  #1  
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Default My T started overheating today??? 180Q with GIAC Chip

I was on the US/CAN bridge in heavy stop-and-go traffic on my way back to Toronto from niagra falls. I was in traffic for no more than 30 min, and was driving for about 15 min before hitting traffic. I changed gears between 1st, and neutral, and was releasing the clutch without riding it, even though I was in heavy traffic.I noticed that the temp gauge was almost at the red line. Why would this happen??

Another problem thats prob assosiated to this:

Also when starting the car, the temp signal on the computer goes on for about 3 min indicating that the car is not warmed up yet or overheating. Thats been going on for about a week or so, the only thing I did that could have caused this is I slightly turned the collant tank lid open, and some steam came out, and the collant started to boil/bubble....I quickly closed it, and read my manual which said that the TT uses a "sealed" cooling system, and coolant should only be added at the dealership (cause they use a special coolant)

Could I have caused serious damage to my car? Any ideas? I admit I know jack about my mechanics, but am trying to learn...so dont flame me..thanks in advance

Btw, Im running the GIAC chip, I dont think that would cause my car to overheat, cause I was reving high at all either.
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Old Aug 25, 2002 | 11:14 PM
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Default Not your fault at all... (more)----->>>

The fact that you opened the expansion tank lid had nothing to do with it. The quote from the manual states the obvious, i.e. that it has a sealed cooling system, and that you should only use Audi's G12 red/purple coolant and not the G11 or any aftermarket one.

Anyway, many TTs (esp. MY01 and MY02) seem to have an over-sensitive temp gauge. The most common thing that causes it is the coolant temp sender that goes bad. Since yours comes up with a temp warning signal on the DIS, I'm 99% sure that this sender or some other sensor causes the trouble.

JUst for the record, the temp gauge on mine climbs just before the red line (at 110*C), then drops back again everytime I sit in traffic or push the car hard (near top speed). Did it when standard, does it now that it's chipped. The dealer changed the whole instrument cluster and nothing happened. Then he changed the temp sender, didn't do it either. I learned to live with it. I also found out that the temp gauge seems to agree with the value displayed at cell #49 on the climatronic (and of course the coolant's temp shown at the VAG-COM). Others here have cured it by changing their temp sender though.
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