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You most likely require an A/C system recharge. There should be a temp sensor under the hood near the passenger firewall connected between heater hoses to control the ac and heater temperature. Replace that first.

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โˆ™ 2009-04-21 16:26:26
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Q: What is wrong with a 1997 Mercury Grand Marquis if the climate control won't regulate the temp and the AC blows warm?
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