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I should have mentioned this before, but my 90 TSi AWD ran fine for about 30 minutes without a radiator fan and straight water in it.
The main thing is how much idling in traffic you'll be doing. If you can keep moving, you'll be fine. If you have to stop often and for very long, you're screwed. There just won't be enough airflow.
The fact that you don't have a temp gauge is definitely a red flag in my mind. Don't do it!
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