Hot Idle Compensator (Non Comp. Controlled): Testing and Inspection

Fig. 14 Hot idle compensator schematic:

The HIC, Fig. 14, uses a bi-metallic spring to allow additional air flow into the engine during very high engine compartment temperatures. This additional air flow prevents an unstable idle caused by the rich air/fuel mixture that results from these high temperatures.

Fig. 15 Checking hot idle compensator operation:

TESTING
1. Remove air cleaner.
2. Disconnect vacuum hose from HIC.
3. Check temperature at HIC with thermometer.
4. Blow air into HIC. HIC should be closed at temperatures below 113°F, and open at temperatures above 149°F, Fig. 15.
5. Reconnect vacuum hose and reinstall air cleaner.