why does it happen when i put my defrost on my ac lights up

Asked by Jul 01, 2014 at 09:55 AM about the 2003 Lincoln Navigator Luxury

Question type: Maintenance & Repair

2 Answers

The A/C will always come on when the 'defrost' setting is used, it runs the air through the evaporator and the cold removes moisture, then through heater core to heat

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It also helps prolong the life of the AC compressor preventing it from sitting idle for months at a time.

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