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A vacuum actuated time delay relay is located on the bottom of the fresh/recirculating air door hous- ing. The purpose of this relay is to reduce the interior windshield condensation to an acceptable level.
When the ambient temperature is above 25 degrees, and the heat or defrost buttons are pressed, the air conditioner will go on for a period of 1 to 10 minutes.
If the system is shut down for less than ten minutes no delay will occur upon restarting. The relay will reset automatically after ten minutes shut down.