The system operates on 12 volts. Under some conditions heat from the window may not be detected by finger touch. The length of time required to remove interior fog from the rear window will vary with the following conditions:

This system uses a switch mounted in the heater-A/C control module with an integral indicator lamp that will operate for 5-10 minutes and turn off through the use of an automatic timer. Turn the system off during this operation by turning either the instrument panel mounted switch or the ignition switch to OFF.