Question about 2004 Chrysler 300M

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How to replace 04 chry 300m heater core

I need instructions on how to replace 04 chry 300m heater core

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This is not a job for the unfamilliar. the air distribution box is fragile and easy to break the doors or the box... then the parts are not commonly replaced, so hard to get new ones....

Posted on Sep 25, 2009


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Posted on Jan 02, 2017


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Is the 04 and 05 heater core replacement procedure the same?

if the vehicle model is the same (eg: 04 impala/ 05 impala) then yes the replacement instructions would remain the same.

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I have an 1999 chrysler 300m an it has an overheating problem. There is also water all over the driver side floor (front n back) it is soaked. It takes about 25mins b4 it starts smoking. Can som1 plz help...

Typically if your leaking coolant inside the car, it indicates your heater core is split and leaking. Replacing the heater core is quite the job. It requires removal of the dash board and heater box. i replaced one in a 97 Cirrus at work last week and it was a 6 hour job. If your not mechanically inclined i would definitley recomend phoneing around for quotes to local auto repair shops and getting it done profesionally.

Mar 15, 2011 | 1999 Chrysler 300M

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My a/c heater fan will not turn off in my 2000 chry 300

You may need a new switch if it is in Manual mode... hope for that.

Feb 01, 2011 | 2000 Chrysler 300M

1 Answer

How do you replace heater core on chrysler 300m 2002

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.

Jan 07, 2011 | 2002 Chrysler 300M

1 Answer

Heating problems

replace the heating core but change the antifreeze first and clean the system and make sure there's no stop leak in the hoses. you will need to flush the heater core out completely several times to know for sure.

Mar 06, 2010 | 2004 Chrysler Sebring

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Heater core

Do you want to know how to remove and replace it? Check here for instructions if you want them. It helps to have pictures and instructions.

Feb 15, 2010 | 2001 Chrysler 300M

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Heater core instructions for 04 Chevy Impala SS

Before you go thru that expense. If it is water leaking,check the evaporator. Sometimes it gets plugged with debris. So first, decide if it is water or anti-freeze. Also, I have taken the heater hoses off of the inside of the motor area and flushed the core out. It works on some.

Jun 01, 2009 | 2004 Chevrolet Impala

1 Answer

My 2000 chrysler 300m is leaking water from the air conditioner in to floor board the drain line is clear

it is the heater core failing ..not the a/c ....pressure test radiator (cooling system) to be sure ... then R&R heater core...good luck

Jun 29, 2008 | 2000 Chrysler 300M

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