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walter pickwoad Posted on Apr 25, 2016
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Air/heater wont shut off - 2006 Mercury Grand Marquis

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jack layton

jack layton

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  • Mercury Master 5,569 Answers
  • Posted on Apr 25, 2016
jack layton
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If the blower motor won't shut off, pull the blower motor relay in under hood fuse box. That should kill it till you find the problem. I don't know if you have automatic hvac or manual hvac?
Can you check for hvac trouble codes? Some of the national brand auto stores will check codes for free.
If blower motor wiring connector has both voltage and ground, it will run as long as the battery has voltage.
I saw two different wiring diagrams on your blower motor, I don't know which one applies?

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