Question about 1997 Mercury Cougar XR7

3 Answers

Heater core replacement

I have a book and alot of free advice. BUT what is easiest way to remove heater core? General manual says to undo steering coloum? Yes or no ?I got alot of stuff off, but main frame hard to undo. I cannot see heater core yet.I am a backyard mechanic. trying to help my daugher. 1997 cougarxr7 v8.164,000 runs like a cougar. strong. but cold inside.

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  • sosewlinda Dec 05, 2008

    you never answered my question.Just agreed with my statement. Your as helpful as a fish out of water.Enjoy my $10 you probably need it more than I.

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Hi and welcome to FixYa,

Just so you know, Mercs are not that common in my country. Being in SEAsia, it is customary that the heater core be either removed or bypassed for imported American vehicles here. Having said this, I am assuming that the reason for the removal and replacement is a leak, otherwise perhaps there is no need to go through with this.

To your concern, I was made to understand that the steering column has to be loosened, the console has to be removed and the dashboard as well, sorry no easier way to go about this that I could squeeze from my source. Additional information that may be of help to you:

  • There was a related and important Technical Service Bulletin pertaining to heater core problems here;
  • An illustrated heater core removal procedure for another make maybe found here;
  • Of course a temporary workaround/alternative is just to install a near floor mounted exposed heater core with a fan.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Dec 02, 2008

  • Louie  Role
    Louie Role Dec 04, 2008

    Hi again,



    Any updates or developments so far?





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Heater cores can be easy on some cars, tough on others.

You have the repair manual so thats a good start.
First, those manuals usually cover several models and it may not be acurate. You dont want to undo alot of stuff you dont need to.

First, make sure you actually know where the heater core is. look under the hood where the fire wall is and look for two pipes ( inlet and outlet) from the heater core. They are usually about and inch thick and couple to the cooling lines and go into the engine somewhere.

the inlet/outlet lines you are looking for are usually about 3 to 5 inches apart. Once you locate them and know those are them, that will give you an idea where the actual core will be on the other side.

Im not sure but, it depends on the car, but you may not need to remove the steering column. Usualy the heater core is located behind the dash behind the stereo. and is inside a plastic casing.

When your heater is turned on, the fan blows over the heater core to warm the air that blows into the cabin, so if you follow the air vent from the A/C blower moter, you should eventually find that it goes into a casing and then back out.

That casing has the heater core inside. Its usually held in place with a bolt in clamp on the fire wall side where it comes out and goes to the engine, and you have to remove it before you can dislodge and pull it out from under the dash.

Make sure to organize your screws and bolts and note where they go so you dont have any left over like I did when i changed the one on my 99' Alero :(


Anywho, be carefull removing it, you dont want to bend any of the radiator fins since its Aluminum.

May I ask why you need to replace it? Are you sure its Leaking or cloged? If its leaking, you would have coolant leakage on the floor of the car and in the air duct. Dont confuse this with water built up in the A/C Blower casing that happens if it rains really hard. Mechanics will often miss diagnose that as a leaking Core as Pep boys did woith my alero, which is why i strted working on card my self.


Also, there may be plastic or Metal adapters that connect the heater core lines to the large ones near the engine, be carefull not to crack or break these as they may be hard to find. Usually NAPA has them though.

Now i know this is more advice than an actual answer but anything helps.

Bassically your going to do more removal of plastic from under the dash than anything. Lay the plastic for the ductwork on the ground in a similar patern to the way it goes on so you save time guesing, lay the screws and pushpins with them as well.

Removing the steering column to do a heater core seems unusual as the steering and drive train would normaly take up all the space on that end of the car, the heater core should be behind the radio, low to the floor where it slant up, tucked inside a plastic case that the air duct passes through.

I found that my heater core was alot easier than wht the manual stated, to remove because it was instructions for a 4 cyl engine and mine was a 6cyl, which had more space to work with.

Hope this provides some help or insight.

Good Luck

Posted on Dec 02, 2008

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If you have the manual and have had plenty of advice i would follow what the manual says!! After all they don't supply them with the car for nothing, and after having a dig around i recon thats the best idea!!

I will keep looking to try and find an easier way but i suggest you follow the manual for sure, at least you know that you will be mistake free and if you do make a mistake you have the manual to refer to

kind regards and thanks for using Fixya!!!

Posted on Dec 02, 2008

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It will require several hours of labor just to get into the heater core. Its not so much the heater core replacement, its taking most if not all of the panels underneath the passenger side underneath the dashboard. Dpending on your car model, it may also require you to remove the glove box just to have access to the heater core.

In rare cases you have to remove the whole top dash board but most cars in general only require to remove panels underneath the dashboard on the passenger side. It's tricky to remove the heater core because it is well hidden behind many panels, a whole lot of screws to remove. Then you have to remove or cut the heater hoses in front of the engine compartment as those hoses are attached to the heater core.

I just replace the heater core in my old buick and it took some effort to undo all those panels and hoses and screws but i finally got it all done and heater works perfect. That repair at a automovtive repair shop would of cost me 350 to 400 dollars. I just spent 35.00 bucks for the heater core and another 12.00 bucks for new heater hoses and that was it, that and the intense labor involved to remove the old heater core. But i saved a huge bundle by doing it by my self, good luck.

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Cars these days are put together in a modular way which tends to make things difficult for subsequent repairs and replacements. The first thing to be fitted in the bare body shell would be the heating and ventilation box, pipes and cables and then the complete dash probably with steering column already attached.

You didn't mention the make and model of your car and I doubt that would help me if you did as you are probably over the water with the steering wheel on the wrong side.
As a general rule in order to access the heater matrix the car needs to be taken back to the stage in production when it was originally fitted. Sometimes the complete heater unit must be removed and sometimes once there is access there is a helpful letter box slot to slid the matrix out.
In these cases access and replacement is usually more difficult if the car was designed as a right-hand drive but is in fact a left drive and vice-verso.

It isn't the sort of job I would like to tackle without a repair manual to hand, especially in winter when plastic is very brittle and unforgiving.

Needing to remove the entire dash along with the steering column is entirely realistic and unless you can see a helpful letterbox I advise you to do that which will in the long run save your knuckles and your temper and maybe your marriage.

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Do I have to drob the steering colum in my 1991 licoln TC in order to replace the heater core?


No you do not have to drop the steering column to change the heater core. It should be located under the passenger side of the dashboard. The easiest way to find where it is located would be to look under the hood for two hoses that go from the front of the engine through the firewall and that will tell you exactly where it is located. To replace the heater core you will have to disconnect the two hoses under the hood from the heater core then remove the heater box from underneath the dashboard.

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The fan is on and the heat is turned on just not getting hot


You should check a few things here.

Check the hoses going into the heater core from the back of teh engine (underneath the throttle body).

Check the Thermostat guage and make sure it is not faulty.

Replace the coolant in your car. (undo the plug at the bottom of the radiator and let the fluid drain out) Once drained close the plug and then fill it back up with approved coolant)

Run the car until hot (about 15 mins and then see if there is any hot air coming out)

Bad news will be if your heater core is busted. You shouldn;t wait too long to check this out as a busted heated core (clogged) will eventuallu force the seals open and you will get coolant leaking into your car.

If it is your heater core these are steps i followed to replace mine:

Disconnect the negative battery terminal.

Disconnect the top and bottom hoses from the heater core next to the firewall)

Pull off the steering wheel
Undo the steering wheel bolt.
Undo the 3 screws holding the steering wheel cover in place, unclick them and put to the side.
Undo the centre console
Undo the glove box - you'll need to manipulate the stops on the inside and let it fall to the floor before - undo the two bolts at the bottom.
Remove the Instrument panel, radio, radio frame.
Undo the single screw in the bottom of the casing surrounding the vents control, gently pop out the vent plate.
Undo the 4 screws holding the vents controls in place.
Remove the frames that are holding the vent controls in place (either side of the centre colsoles (or where they were)
Remove the two side vents (push down and pull back).
Remove the two bolts (either side) that are holding the dash up.
Remove the two bolts (bottom left corner, bottom right corner) that are holding the dash up.
Gently pull the dash up and forward to (making sure you don't pull any wires off there guides and place to the side).

Put the dash to the side (resting on the front seat)

The heater core should be sitting in the middle of the dash.

Remove the four bolts (two top, two bottom) and place to the side.

Pull the heater core back and move to the side to clear the holes in the firewall.

Manipulate the heater core to the side and move out through the gap in the dash and the cross bar (it is a tight squeeze but you can get it out)

Installation is the reverse of all the instructions.

when you have finished installing the heater core make sure you bleed the engine with coolant

Top up the radiator - keep the cap off, turn on the engine, turn on the heater on the heater to full, with the engine running keep topping up the radiator as the water runs through the new core...keep doing this until no more water goes through - this last step takes a while so be patient otherwise you will start to drive the car and will have an overheating engine very quickly...

Feb 07, 2010 | 2004 Mitsubishi Lancer

1 Answer

How to remove and replacse 2002 mitsubishi lancers heatercord


Do you mean Heater Core???

Disconnect the negative battery terminal.

Disconnect the top and bottom hoses from the heater core next to the firewall)

Pull off the steering wheel
Undo the steering wheel bolt.
Undo the 3 screws holding the steering wheel cover in place, unclick them and put to the side.
Undo the centre console
Undo the glove box - you'll need to manipulate the stops on the inside and let it fall to the floor before - undo the two bolts at the bottom.
Remove the Instrument panel, radio, radio frame.
Undo the single screw in the bottom of the casing surrounding the vents control, gently pop out the vent plate.
Undo the 4 screws holding the vents controls in place.
Remove the frames that are holding the vent controls in place (either side of the centre colsoles (or where they were)
Remove the two side vents (push down and pull back).
Remove the two bolts (either side) that are holding the dash up.
Remove the two bolts (bottom left corner, bottom right corner) that are holding the dash up.
Gently pull the dash up and forward to (making sure you don't pull any wires off there guides and place to the side).

Put the dash to the side (resting on the front seat)

The heater core should be sitting in the middle of the dash.

Remove the four bolts (two top, two bottom) and place to the side.

Pull the heater core back and move to the side to clear the holes in the firewall.

Manipulate the heater core to the side and move out through the gap in the dash and the cross bar (it is a tight squeeze but you can get it out)

Installation is the reverse of all the instructions.

when you have finished installing the heater core make sure you bleed the engine with coolant

Top up the radiator - keep the cap off, turn on the engine, turn on the heater on the heater to full, with the engine running keep topping up the radiator as the water runs through the new core...keep doing this until no more water goes through - this last step takes a while so be patient otherwise you will start to drive the car and will have an overheating engine very quickly...

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1 Answer

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If its anything like my 97 lancer you will need to follow these steps..

Disconnect the negative battery terminal.

Disconnect the top and bottom hoses from the heater core next to the firewall)

Pull off the steering wheel
Undo the steering wheel bolt.
Undo the 3 screws holding the steering wheel cover in place, unclick them and put to the side.
Undo the centre console
Undo the glove box - you'll need to manipulate the stops on the inside and let it fall to the floor before - undo the two bolts at the bottom.
Remove the Instrument panel, radio, radio frame.
Undo the single screw in the bottom of the casing surrounding the vents control, gently pop out the vent plate.
Undo the 4 screws holding the vents controls in place.
Remove the frames that are holding the vent controls in place (either side of the centre colsoles (or where they were)
Remove the two side vents (push down and pull back).
Remove the two bolts (either side) that are holding the dash up.
Remove the two bolts (bottom left corner, bottom right corner) that are holding the dash up.
Gently pull the dash up and forward to (making sure you don't pull any wires off there guides and place to the side).

Put the dash to the side (resting on the front seat)

The heater core should be sitting in the middle of the dash.

Remove the four bolts (two top, two bottom) and place to the side.

Pull the heater core back and move to the side to clear the holes in the firewall.

Manipulate the heater core to the side and move out through the gap in the dash and the cross bar (it is a tight squeeze but you can get it out)

Installation is the reverse of all the instructions.

when you have finished installing the heater core make sure you bleed the engine with coolant

Top up the radiator - keep the cap off, turn on the engine, turn on the heater on the heater to full, with the engine running keep topping up the radiator as the water runs through the new core...keep doing this until no more water goes through - this last step takes a while so be patient otherwise you will start to drive the car and will have an overheating engine very quickly...





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1 Answer

I need to know how to replace a heater core in a 1998 dodge ram


these ar not fun at all. you have to undo the steering column and shaft so the entire unit lays down on the driver seat, then remove all screw bolts or nuts that fasten the dash to the firewall, then slide the dash backwards toward back of truck obviously and you then can get at the black box the heater core is mounted inside of.you will have to then undo the screws on the cover of this bow,take you jeater hoses off from under hood,then remove heater core. the whole job will takeabout 5 hours with good experience, maybe around 8 with little or no experience. I recomend buying a Haines or Chilton manual to follow if you do this your self. the job really isn't hard,just time consuming,and a few tight places to get into.

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I need to know how to change a heater core in a 81 monte carlo. don't have a book to go by


A good place to find such information is at WWW.AutoZone.com.
You can select your make and model of vehicle, go to the "how to" section and in many cases it will give you the instructions for replacing various parts and it is free.
AllData.com is another resource that you will pay less than $30 a year for your first vehicle, it is an on-line service manual web site, very good.
Below is the procedure for replacing your heater from the Auto Zone site.
Good luck, let me know.
Regards,

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.

Sep 15, 2009 | 1983 Chevrolet Monte Carlo

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