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2004 Mercury Monterey driver's side heater not working

Left side heater is blowing cold air, no matter the temperature set, right side works fine

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 432 Answers

SOURCE: Why does my 2001 Mercury Sable climate control only blow heat?

It could be the door that should be shuting off the heater core area is not shuting.The door works with engine vaccuum.The vac. comes from the intake manifold. With your car being a few years old, the heat from the engine may have caused the vac. hose to dry out and crack or become disconnected. With the engine cold and off, look under the hood. A small size vaccuum hose should be connected to the intake manifold and run inside the cabin area. This is one thing you can check. I hope this helps you.

Posted on Sep 05, 2009

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  • 71 Answers

SOURCE: heater doesn't work

Sounds like the heater core is stopped up. Try removing the heater hoses and backflushing the core.If this doesn't work replace the core.

Posted on Nov 22, 2008

onyeredson
  • 404 Answers

SOURCE: heater only blows cold air but hoses are hot

Hi!
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K

Posted on Mar 01, 2009

  • 1 Answer

SOURCE: cold air from heater in 2001 mercury grad marquis

Most likely your thermostat. Pretty easy to replace and the most likely the cheapest. It is usually located on the top of the engine with a radiator hose attached to it.

Posted on Mar 28, 2009

warlock61
  • 659 Answers

SOURCE: Heater temp on mercury '98 mountaineer only blows hot

could be the blend door motor or the door could be broken these are common

Posted on May 09, 2009

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Where are the fuse boxes located a 2004 mercury monterey?


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On my 2004 Gmc Envoy, Heat only comes out on passenger side, still blows cold air on drivers side. Defrost, floor and vents all produce air flow. Rear heater works fine. A/C works fine. Any idea?


Sounds like the driver's side temperature actuator or blend door are defective. Part of the dash needs to be removed to access these parts.

Oct 26, 2011 | 2004 GMC Envoy

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The heater on my 2004 mercury mountaineer does not work. When turning the dial from ac to heat, cold air blows out while a sound like a door opening and shutting is heard.


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The drivers side heater control does not work. It blows cold air no matter what position the control is in. What is the problem? The passenger side works fine.


try to pop off the panel to the dash and follow the vent sounds like it has become disconnected somewhere and cold air coming from outside somewhere on firewall also check the heater core see if it is blocked by something like disconnected line

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2004 Yukon. driver side air conditioner not working


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Passanger side heater blows cold while driver side is hot


U will need to replace the pass side air temp control blend door acuator motor.

Jan 22, 2009 | 2004 Jeep Grand Cherokee

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