Question about 2003 Mercury Grand Marquis

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Heater blows cold air - 2003 Mercury Grand Marquis

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  • Thomas Opachen Nov 28, 2011

    I have a 2004 dodge intrepid 3.5 l... I changed the thermostat, and made sure the fluid level was proper. I went to bleed it and nothing came out. The engine temp was midway, but no heat...only cold air. I don't know where the blend door actuator is located. No dash problem lights on, so I am lost. Could it be something to do with the radiator flow (clog) Top hose is warm but lower seems hot.

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Hi!
If the Temp. Selector Control is set to Heat and blows cold air, your Blend Door Actuator may be stuck or it is inoperative. The actuator is not fixable, if it fails, it must be replaced. Follow the instructions to remove and replace it.

  1. Disconnect battery negative cable from battery and properly isolate to prevent accidental reconnection.
  2. Remove the instrument panel.
  3. Disconnect the electrical connector from the blend door motor/actuator.
  4. Remove the four screws holding the blend door actuator to the plenum.
  5. Remove the temperature blend door actuator.
BLEND DOOR ACTUATOR CONNECTOR heater blows cold air - e8349ea.jpg

BLEND DOOR FASTENING SCREWS 9744710.jpg

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Posted on Oct 07, 2010

  • Tom Naderski Jun 20, 2014

    4 thumbs up !!!!

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  • 3 Answers

When this happens i think maybe the door inside housing is stuck.either a vacume hose has sprung a leak or if that model uses wire inside of a spring ,a twig or leaf is wedged.the little door separates the chambers inside the housing.one side is heat and one side is cold.

Posted on Oct 07, 2010

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Posted on Jan 02, 2017

dr_layinlow
  • 60 Answers

SOURCE: 2001 malibu-heater is blowing cold air

sounds like you have a bad temperature sensor in dash or the cable has eitehr broken or come off the heater switch under the dash!!

Posted on Dec 07, 2008

  • 651 Answers

SOURCE: heater blowing cold air

squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.

Posted on Jan 04, 2009

  • 45 Answers

SOURCE: 1997 audi A4 heater blowing cold air

You will have to change the heater core. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core.

Posted on Nov 13, 2008

  • 4 Answers

SOURCE: heater only blows out cold air

Check the valve that controls coolant flow to the cabin

Posted on Feb 12, 2009

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

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