I have checked and here is the facts:

来源: 于 2009-10-13 18:25:20 [旧帖] [给我悄悄话] 本文已被阅读：次

1. do not see coolant leaking anywhere.
2. 100% sure thermostat is installed in correct direction.
3. coolant level is not low.
4. the belt driving water pump is not loose.

It is really a puzzle to me.