这个老白也还算熟悉, : l2 k# ?- u$ n, Q0 [1. low coolant level" U9 t u4 j' U$ h( T
2. thermostat is stuck open 9 l. o5 D, @# T2 e1 R# U E- p! D3. fan motor does not run well : E2 Q( C& f1 H0 s2 G0 Z5 }; t3 c4. heater contorl valve blocked 1 ~6 @) Y- X! S( q% E9 ?etc