Question about 1985 Mercury Marquis

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Heater Core Replacement

Where the heck is the heater core located on my 1985 mercury marquis. I had my dash apart and still was perplexed. Where did I go wrong?
saydeekaye_3968@yahoo.com

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  • saydeekaye_3 Sep 15, 2008

    Thanks a lot. I was just not going far enough. That was a pain in the but to fix. Next time I am going to find someone else to do it or get rid of the car. LOL!!!

    saydeekaye

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I need pictures of how to change a heat core.

Posted on Dec 02, 2008

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Hello your heater core is normally in the heaterbox pass side some fords had a access plate behind the glove box wich i hope you have how to find out remove your contents out of glove box undo holders if wire unscrew if rubber stoppers reach in bend in so glove box lid drops all the way down now look straight in is there a rectangled plate similar to a car radio size with hold down bolts usaull 6 or 8 1/4 hex if not you have a internal you have to look at the front off your heaterbox facing pass side there will be a area that splits apart held in with 1/4 inch or 5/16 hex bolts all have to come out lower part of dash board needs to be unbolted to get the face out if you have ac wich you most likely do it is a lot harder all lower duct work needs to be removed goodluck

Posted on Sep 13, 2008

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1 Answer

1985 grand marqius, the heater hoses have been by passed, i've been told it could be that the "heater coil?" may have gone bad, where is the hearter coil located?


Many people bypass the heater core if it is leaking. It stops the leak but then you have no heat.
The core itself looks like a small radiator and is located inside the big box under the dashboard and isn't very easy to remove. You will need a chilton or haynes manual to guide you through the job or bring it to a shop and have them do it.

Dec 31, 2010 | 1985 Mercury Grand Marquis

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The heater core is bad


If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Dec 17, 2010 | 1997 Mercury Grand Marquis

2 Answers

Diy heater core replacement


If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Dec 13, 2010 | 2000 Mercury Grand Marquis

2 Answers

Removal of heater core


Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Dec 08, 2010 | 1984 Mercury Marquis

1 Answer

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.

Mar 24, 2009 | 1999 Mercury Grand Marquis

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2001 mercury marquis no fan for heater. climate controlsystem on


Ok you have a bad blower speed controller if you have power to the motor.
It is located under the hood in the heater housing just below the heater core coolant hoses.
You will have to drain coolant.
Remove the nuts holding the Vapor Management valve and set it aside.
Remove coolant hoses to heater core.
Disconnect electrical connector to the blower speed controller,remove screws,pull it out of heater housing.

Feb 16, 2009 | 2001 Mercury Grand Marquis

1 Answer

Heater core


It is a big job.  I had to move my dash aft several inches to access the heater core.  Lots of disassembly.  Chiltons, all data, or any manual are a big help.

Jan 02, 2009 | 1990 Mercury Grand Marquis

1 Answer

1999 Mercury Grand Marquis


wher do you live ? Im in GA.

Dec 03, 2008 | 1999 Mercury Grand Marquis

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