Heater core replacement

Tiny
WIGTAIL
  • MEMBER
  • 2000 DODGE DAKOTA
Does the heater box definitely have to come all the way out of the truck or can I take the top off the heater box after everything is loosened, and replace the core and get the lid back on the box while still behind the dash?
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Sunday, November 30th, 2008 AT 9:59 PM

40 Replies

Tiny
BLUELIGHTNIN6
  • EXPERT
Hello,

You will need to drain the coolant and vacuum down the AC system here are two guides to walk you through the repair and instructions and diagrams below to how on your truck below.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

and

https://www.2carpros.com/articles/replace-heater-core

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Sunday, November 30th, 2008 AT 10:07 PM
Tiny
WIGTAIL
  • MEMBER
Here's the skinny on replacing the core. Heater or ac, same procedure. I just did one.
Disconnect the battery negative cable.
Pull off the plastic dashcover.
Do not take all those screws around the opening out.
The instrument panel can stay.
Remove the plastic lower and center dash covers.
Look right under the steering column at the little black cable and the white thumb adjuster. That cable operates the gear indicator, unhook it from the column or you will break it. They're fun to fix too.
Take the drivers seat out and sit it back a few inches, seriously, the steering wheel will go all the way to the floor but te seat makes it really tight, best to sit the seat back.
Take the two bolts out of the center dash mounting bracket, leave the othe three. 10mm
Disconnect the dash main harness and the little one beside it also.
Look under the dash and see if any wires have been plastic tied. You might want to cut them loose or they can get pulled loose. You decide.
Take the two bottom dash mounting bolts completely out of the sliding thing, dont just loosen them.
Take the four nuts off of the steering column and lower it down. Sit the dash over the center bracket and lay it back. Taking loose another wire plug behind the dash.
Take the flexible hose loose at the heater box. Take the heater cable off at the box and the vacuum lines apart at the connection. Go under the hood.
If equipped with air conditioning, recover the refrigerant.
Disconnect the accumulator inlet tubes.
Drain the cooling system.
Disconnect the heater hoses from the heater core tubes.
Remove the four nuts from the heater-A/C mounting studs on the engine compartment side. Hint, one is hid behind the trans fill tube and another one is behind the plastic thing holding the heater hose. Another Hint, you will need a swivel head ratchething wrench 7/16 or 11mm, not a ratchett and socket combo, oh no.
Find the vacuum line going inside by the coolant hoses, and disconnect it.
Go back inside on passenger side.
Remove the mounting brace that secure the heater-A/C housing to dash board.
Pull the housing rearward far enough for the mounting studs and evaporator condensate drain tube to clear the dash panel holes.
Rotate the box and remove it from the vehicle. Some take them out under the dash, i came out the top, rotating the box clockwise coming up and out.
Take the little nut and arm off the flapper. You can leave the push nut alone, but take it off if you can, its easier to put back together. Unplug the vacuum lines from the servos. Be very carefull prying up on the cover, it's very brittle.

Lift the heater core out of the housing.
Installation is the reverse of removal.
Any questions, i'll try.


https://www.2carpros.com/forum/automotive_pictures/279457_100_5038_1.jpg



https://www.2carpros.com/forum/automotive_pictures/279457_100_5107_1.jpg



https://www.2carpros.com/forum/automotive_pictures/279457_100_5111_1.jpg

wigtail@hotmail.com
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Wednesday, December 3rd, 2008 AT 10:13 PM
Tiny
SCOTY
  • MEMBER
I had to abandon the attempt to do at a later date.

I put what I believe to be the dash and all electrical connectors back.

(I left some trim pieces off)

The electric is definately on. The dash, lights, airbag, etc. All come on.

However, when I turn the key, I have a clicking sound.

Any ideas?
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Sunday, December 7th, 2008 AT 6:42 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Is the engine trying to crank at all, or just hearing a clicking noise?

If engine isn't cranking, possible faulty battery, alternator or starter. If engine is cranking, possible faulty relay in the dash. If you can tell that the clicking noise is in the dash, try to feel the relays and see if you can feel any of them clicking. This is the one that needs replacing if that is the case.
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Sunday, December 7th, 2008 AT 6:45 PM
Tiny
SCOTY
  • MEMBER
I went back out to check the rotation, and it fired right up. Thanks for the quick response.
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Sunday, December 7th, 2008 AT 7:39 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
No clicking now?

Great, glad you have your ride up and running again.
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Sunday, December 7th, 2008 AT 7:43 PM
Tiny
ALEX262
  • MEMBER
  • 2000 DODGE DAKOTA
  • V8
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
How do I replace the heater core
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Wednesday, February 6th, 2019 AT 2:44 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Actually, this is a very involved process on this truck. If you have AC, you need to evacuate the system. WHat I recommend is to purchase a good repair manual with step by step instructions and pictures to help identify parts. For me to explaine it via the internet allows too much room for error.
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Wednesday, February 6th, 2019 AT 2:44 PM (Merged)
Tiny
SADAHL
  • MEMBER
  • 2000 DODGE DAKOTA
  • 6 CYL
  • 4WD
  • MANUAL
  • 135,000 MILES
I have begun to remove the dash and the heater core hoses but cannot seem to get to the heater core because it is in a black case that also is connected to the AC. Do I have to disconnect the AC to get the houseing that the heater core is in. And take it completly out of the dash to replace the heater core?
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Wednesday, February 6th, 2019 AT 2:44 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Yes discharge AC and entire case must be removed. It houses both evap & heater core
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Wednesday, February 6th, 2019 AT 2:44 PM (Merged)
Tiny
JOHN MORGAN
  • MEMBER
  • 2000 DODGE DAKOTA
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 99,989 MILES
I am try to replace the heater core in my 2000 dodge dakota I have just about all of the stuff unhook, I have found 3 of the nuts on the outside fire wall I can not fine the 4th one, I found the one behind the transfill tube also the one behind the plastic clip holding the hose also the one buy the heater core outlet tubes. I am also have trouble disconnect the accumulator inlet tubes. I can not get them to come lose. Is there a tool I have to have to get them lose. Thanks for any help john morgan
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Wednesday, February 6th, 2019 AT 2:44 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
No special tools


https://www.2carpros.com/forum/automotive_pictures/99387_Graphic1_505.jpg



https://www.2carpros.com/forum/automotive_pictures/99387_Graphic2_244.jpg

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Wednesday, February 6th, 2019 AT 2:44 PM (Merged)
Tiny
JOHN MORGAN
  • MEMBER
To BMRFIXIT, the info you sent me was very helpful I want to thank.I hope I don't run into anymore promble thank you again john
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Wednesday, February 6th, 2019 AT 2:44 PM (Merged)
Tiny
BURNSCLAYTON
  • MEMBER
  • 2000 DODGE DAKOTA
Heater problem
2000 Dodge Dakota 6 cyl Four Wheel Drive Automatic

how to replace heater core at home on this vehicle?
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Wednesday, February 6th, 2019 AT 2:46 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
1.Disconnect negative battery cable. Drain cooling system. Remove instrument panel.
2.In engine compartment, disconnect heater hoses and plug all openings. Remove 4 heater assembly nuts from engine compartment firewall. Inside vehicle, remove heater assembly support brace screw, and swing support brace out of way. Move passenger seat rearward.
3.Carefully pull heater assembly rearward until studs and heater core tubes clear firewall. Lower heater assembly. Remove heater assembly from vehicle.
4.Place heater assembly on work bench with assembly housing cover facing down. Remove 2 bolts securing heater assembly housing cover to blower motor housing cover. Unplug vacuum harness connector from panel/defrost door actuator.
5.Remove floor duct from heater assembly housing. Remove 2 bolts securing heater assembly housing cover to lower housing near floor outlet. Turn assembly over. Disengage vacuum harness retainer and vacuum harness. Remove 13 screws securing housing cover.
6.Remove blend-air door lever. Gently pry panel-defrost door lever off. Pull up on heater assembly housing cover far enough to separate cover sealant and remove cover.
7.Ensure blower motor housing cover sealant is in place and in good condition. To complete installation, reverse removal procedure.


https://www.2carpros.com/forum/automotive_pictures/99387_Graphic2_43.jpg

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Wednesday, February 6th, 2019 AT 2:46 PM (Merged)
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2000 DODGE DAKOTA
  • 100,000 MILES
Hi, a co-worker of mine has a 2000 dodge dakota 3.9 litre engine, the engine will not warm up or blow heat, the guage just moves off the first line, he has replaced 3 thermostat's a new heater core and just recently a new water pump, other than using c4 to finish the job, what do you think could be the problem, thx Greg
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Wednesday, February 6th, 2019 AT 2:46 PM (Merged)
Tiny
BLAZE45
  • EXPERT
The only thing that comes to mind where I have seen this happen after what you have already done to the truck is the ambient temperature being so cold that the car does not even heat up. Were talking -25 to -35 degrees outside. Even with a block heater and cardboard over the radiator they struggle VERY much to warm up.
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Wednesday, February 6th, 2019 AT 2:46 PM (Merged)
Tiny
BLAZE45
  • EXPERT
The radiator cooling fan being continually on could also cause this situation.
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Wednesday, February 6th, 2019 AT 2:46 PM (Merged)
Tiny
MANOLO GONZALEZ
  • MEMBER
  • 2000 DODGE DAKOTA
Heater problem
2000 Dodge Dakota Four Wheel Drive Automatic

how long does it take to replace the heater core
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Wednesday, February 6th, 2019 AT 2:46 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Flat rate is around 5 hours. If you have no experience, expect a couple days. Also, the freon will need evacuated from the AC system if you have AC.
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Wednesday, February 6th, 2019 AT 2:46 PM (Merged)

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