这个老白也还算熟悉,. m/ Z" }& Z4 F% M0 e
1. low coolant level% v6 x3 y, f9 x+ `+ X" S% T
2. thermostat is stuck open* V+ d. c# F4 R6 O- A6 f7 k# A G
3. fan motor does not run well ; F& y, k, X# b4 L& f4. heater contorl valve blocked) E+ f/ u3 A0 n" Z4 E' T
etc