这个老白也还算熟悉,! a V* L1 w: Z6 c5 a W( ^6 ]
1. low coolant level- n1 j% U, }1 p K
2. thermostat is stuck open, s( z# {6 P9 a4 F2 f/ j: F2 T3 K
3. fan motor does not run well ; K2 d5 i1 B: c H: G$ p( Z+ m5 ^4. heater contorl valve blocked 8 Z9 p# w5 D% N3 Cetc