这个老白也还算熟悉, " D7 ~6 H# p( f2 I1. low coolant level+ q! c* B0 C) i/ ?9 Y; M8 w5 c
2. thermostat is stuck open Q4 H3 W/ ~3 n- i2 i* d
3. fan motor does not run well- E. ^: r0 ]+ t- r8 C' z! e
4. heater contorl valve blocked J5 u/ O3 |/ m2 r; J0 g) R, z2 p9 f
etc