The blower delay timer is activated when the following
conditions exist:
| • | The engine is not at normal operating temperature. |
| • | The heater-A/C system is set to deliver heat in the Auto Heat
mode. |
The blower delay timer keeps the blower at the minimum speed during
vehicle warmup. This low speed enables the engine coolant to warm up. If the
ambient temperature is very cold, the delay can last for as long as 5 minutes.
To inspect for correct operation of the blower delay timer:
- Select the 15°C (60°F) setting in the HI mode.
Verify that no delay occurs in system operation.
- Select a high temperature setting that is less than 32°C (90°F)
in the AUTO mode.
Verify that the following results occur:
| • | The blower delay timer engages. |
| • | The blower remains at the minimum speed until the engine coolant
warms up but for no more than 5 minutes, . |
| • | At this point, the blower fan will be energized. |
The blower delay timer does not function when the following conditions
exist:
| • | The system is in the HI or the DEFROST mode. |
| • | Cooling is required in AUTO. |
| • | The engine is warmed up. |
| | There is a slow airflow ramp up when the vehicle is very hot. |
The control requires a constant battery positive feed. A constant battery
positive feed maintains the memory function.
