Question about 1989 Plymouth Sundance

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How to change the 89 plymouth sundance heater core

I was told my heater core is leaking and so im buying a new one. its an 89 plymouth sundance...i want to know which side of the dash its located and are there an special instructions when changing it so i dont f up my car more...thank you! :)

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First.... open the hood... yes the hood.... look on the firewall... you will see two rubber hoses going into it... that is where the heater core is located... generally it's on the passenger side but sometimes ..... in my dad's van for one it's mounted in the center... dodge's better idea i guess. while you are under the hood .. examine the hose connectors.... if they are hose clamps easy... if they are special connectors you will have to visit autozone or canadian tire or auto parts store to borrow the tool.... usually have to leave a deposit....
now... climb under the dash on the passenger side and look up... if there are sheilds to remove them... you will need to do that... i often remove the glove box to give me even better access and to see better what i'm doing.
the duct work is often held together by screws or clips. make sure you remove all the ones necessary ... front and back... it's usually a split shell so you only need to lower the one half......... pull the duct work carefull away from the heater core ... look for bolts hold it on ... usually again on the outside by the firewall... before take the bolts out use the tool to remove the hoses. you did drain some antifreeze first right ? .... it's tough to get all the water out so before you pull old core out either be fast about it so you don't spill antifreeze into the car... or tilt it up to drain some fluid out on the outside first.

remove the old core... install the new one... bolt it on... reinstall the duct work.... clean up... reinstall the hoses... refill the rad and leave the cap off when you start it up to add more fluid....

almost done... pinch the hoses gently when the motor is warm to move the air out of the system.... after you install the rad cap... take it for a drive.... when you get back wait till the rad is cool again and take off the cap... fill the rad up again... repeat that a few times to compensate for air bleeding out of the new core...


P.S. i did a heater core on a 69 dart i used to own.... basic car no options... took me fifteen minutes lol

Posted on Dec 17, 2008

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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.
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f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
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