# Thermostat - '99 A4 2.8L - Issues

**URL:** <https://community.cartalk.com/t/thermostat-039-99-a4-2-8l-issues/72265>\
**Category:** Maintenance/Repairs\
**Created:** [May 5, 2012, 10:33am UTC](https://community.cartalk.com/t/thermostat-039-99-a4-2-8l-issues/72265 "2012-05-05T10:33:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![barnyski](https://avatars.discourse-cdn.com/v4/letter/b/59ef9b/32.png) [@barnyski](https://community.cartalk.com/u/barnyski)\
**Post date:** [May 5, 2012, 10:33am UTC](https://community.cartalk.com/t/thermostat-039-99-a4-2-8l-issues/72265/1 "2012-05-05T10:33:12Z")

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So I just spent 3 evenings and 7 beers taking apart the front end of my Audi to replace my thermostat (before job symptoms were periodic heat & reservoir overflow when there was no heat) . After replacing I got heat for ~30 seconds, on par with the initial conditions. Worried, I tested the old thermostat. It failed with flying colors in water very near 212 deg. F. Therefore, replacing the thermostat should have cured the issue. Thoughts, please?

Do I maybe have air in my system? How does one bleed a coolant system?