Blower Delay

The blower delay timer is active when the system determines that the timer should emit heat in the Heat Auto modes.
The blower delay timer keeps the blower at the minimum speed. 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.

Inspect for correct operation of the blower delay timer:
1. Select the 60°F setting in the HI mode. Verify that no delay occurs in system operation.
2. 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 for no more than 5 minutes, until the engine coolant warms up.
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.
If the results that are described in this procedure do not occur, refer to Electrical Diagrams for further diagnostic procedures.