这个老白也还算熟悉, & o/ k D1 g8 E* ]/ T( `4 L; t1. low coolant level) V" ~/ t, p b) ]- ?( p5 {( A, ~! u
2. thermostat is stuck open " y, q+ |9 o' E5 y9 S3. fan motor does not run well$ _% M" c$ x+ @% \( A
4. heater contorl valve blocked2 L+ x! S0 P9 K3 `& Y. n
etc