2004 Mercury Monterey no heat

2004 MERCURY MONTEREY
180,000 MILES • 4.3L • V6 • FWD • AUTOMATIC
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SKYPILOT7
  • MEMBER
  • 3 POSTS
heater working find until I disconnected the battery. now no heat all controls seam to be working, fan OK just no heat

PS wife's car help
Dec 14, 2014 at 9:30 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Check something for me. With the engine running, heat on high, and the engine at operating temp, feel both heater core hoses and see if both are hot. If they are, suspect there is an issue with the blend air door actuator.

Let me know what you find.
Dec 14, 2014 at 9:37 PM
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SKYPILOT7
  • MEMBER
  • 3 POSTS
i will when she comes home, iwhere and how is theblend controled from thank you
Dec 14, 2014 at 9:56 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
The blend air door is electrically actuated on your vehicle. It is a plastic door located near the heater core. When you adjust the temp, the door moves one way to allow heat to enter the vehicle, or the other way to allow AC to operate. If it isn't moving and is in the wrong position, you won't get heat.

I have to warn you, it isn't an easy thing to get to. The dash will need partial disassembly.
Dec 14, 2014 at 10:02 PM
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SKYPILOT7
  • MEMBER
  • 3 POSTS
thank you
i going to disco batt again to see it resets
Dec 14, 2014 at 10:10 PM
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