这个老白也还算熟悉,9 i3 h' U. @) Z0 t7 |8 d6 H% _3 e' h0 w
1. low coolant level; L# _- B: X) f& v3 V2 T
2. thermostat is stuck open : X1 c8 j5 p# D" ]% t$ c3. fan motor does not run well - w7 n ^/ F: V- s5 ?2 J a4. heater contorl valve blocked: N8 |; b% L+ F' {5 `# F! g
etc