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2004 Mercury Monterey no heat

Tiny
SKYPILOT7
  • MEMBER
  • 2004 MERCURY MONTEREY
  • 4.3L
  • V6
  • FWD
  • AUTOMATIC
  • 180,000 MILES
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
Monday, December 15th, 2014 AT 5:30 AM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 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.
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Monday, December 15th, 2014 AT 5:37 AM
Tiny
SKYPILOT7
  • MEMBER
  • 3 POSTS
I will when she comes home, iwhere and how is theblend controled from thank you
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Monday, December 15th, 2014 AT 5:56 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 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.
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Monday, December 15th, 2014 AT 6:02 AM
Tiny
SKYPILOT7
  • MEMBER
  • 3 POSTS
Thank you
i going to disco batt again to see it resets
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Monday, December 15th, 2014 AT 6:10 AM

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