Question about 1990 Mercury Grand Marquis

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I replace the heater core in my 1990 Grand Marquis and the air is not blowing hot but it IS slighlty warmer. What can be the problem?

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Is the air temperature control blend door working correctly check that and then also check to see if the cars engine is reaching proper temperature, you may have a stuck open thermostat.

Posted on Oct 30, 2012

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: The heater in our car is not blowing hot air. It

Check the heater hoses under the hood first to see if they are hot. if they are, there is a temperature control actuator on the top of the heater box. the motors go bad, and the temp door does not move. The motor is hard to get to but if you open the glove box it is to the left, almost behind the radio.

Posted on Oct 16, 2009

emissionwiz
  • 75197 Answers

SOURCE: Cost to replace and repair heater core in 99 Grand Marquis

about $1200 US, this requires the dash be pulled out, about 12 hours of labor.

Posted on Mar 24, 2009

alicantecoli
  • 22095 Answers

SOURCE: 2000 Mercury Grand Marquis will only blow hot air when ac is on

needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

Posted on Jun 21, 2009

ginko
  • 19396 Answers

SOURCE: 2003 mercury grand marquis LS

The blend door is stuck in cold position. That usually happens because the blend door actuator has failed.

You will need to test and replace the blend door actuator.

To replace the actuator you will need to take apart the dash and remove completely the instrument panel,d isconnect the connector, remove the four screws, remove the temperature blend door actuator and replace it.

The replacement is not a job for beginners, since you have to take apart the dash to access the actuator.

Regards.


Posted on Nov 18, 2009

  • 5 Answers

SOURCE: 2004 mecury grand marquis heater or ac will not

check the doors in the heater ductin and make sure all the door motors r workin properly

Posted on Dec 21, 2009

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Heater Water Control Valve REMOVAL & INSTALLATION On early models the heater control valve was part of the heater core inlet. To replace the control valve, remove the heater core as outlined in this section. Remove the control valve from the heater core, being careful not to damage the core. Use new gaskets when installing new valves. The remainder of the vehicles are not equipped with heater water control valves. They use heater unit doors to regulate the amount of heat entering the vehicle. --- I would check that both tubes running to the heater core are getting hot. If they are, then there is a blend door problem. If both tubes are not getting hot, the heater core is blocked somewhere or the heater control valve, if so equipped, is in need of replacement. Good luck on this repair. prev.gif next.gif

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