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A common problem with 2002 LS's are the DCCV, (Dual Climate Control Valve). Pretty expensive, so I suggest finding someone who know's how to reset the climate control and see if that helps. Other than that, you might need to check the DCCV. Also, a no-brainer, make sure your R-134a is topped off. Hope this helps.

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Q: Why does my 2002 Lincoln LS blower switch from cold to warm while in ac mode?
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