How to by pass heater core in a 2001 chysler 300m

Possibly under the trunk floor/ carpeting . Are there humps on either side of the rear of the trunk? look under the carpeting.

Did you change the thermostat? It could be stuck in the open positon, or in backwards, or missing all together. I would like for you to check your heater hoses where they connect to the engine, as this is a very good place for corrosion to build up, restricting coolent flow to your heater core. If this don't fix your heat, I would like to know the reason you changed the water pump. Was it overheating? Did you have heat before you changed the water pump?

Hi,

Chysler HVAC code 23 = Front Mode (Blend) Door - Range too Large.

Possible causes:

- Actuator circuit test faults preset
- Overcurrent faults present
- Mode door or A/C Heater housing components warped, worn, damaged or broken.
- Mode door actuator
- A/C Heater Control (ATC)

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.

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.

You hot air comes from the water circulated through the heater core. It is like a miniture radiator with water flowing thru it constantly. So by opening the "Blend Door" you are permitting so much of this hot air to pass thru.

Seems like for some reason your heater core is plugged up. Just like a radiator can be. So water may be passing through your heater core but not passing through fully. Your heater core gets hot from water passing throught it from the engine. Then your doors open up, in proportion to how much air is permitted to pass over the heater core.

Suggest to remove the heater core and replace it. Seems the blend doors are working properly but again, if you have a non working heater core then no air can pass over the "Hot Core" for you to recieve hot air.

If you are not mechanically inclined, then go to a local parts store and you can buy a car manual, such as Chilton's or Hane's Car manuals, for your year and make to show you how to replace it. Then you can also have it for any other problems that may arise.

The mildew smell you refer to could be anti-freeze. When a heater core starts leaking it may allow anti-freeze (which circulates through it for heat) to be blown through the ducts onto the windshield in defrost mode. The repair is to have the heater core replaced. It may wait for the thermostat to open and allow the coolant to circulate before you notice it. Occasionally the carpet on the passenger side may be wet from leakage.

do the heater hoses get hot to the heater core?

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....

yes you can take the 2 hoses going to the heater core and join the 2 together under the hood so that coolant flows thru the hoses but not thru the heater core

i dont know where emissionwiz gets his information. go to pass side and remove lower kickpanel on center console. remove black plastic clips on heater core lines. remove the phillip head screw on retaining clip and slide out heater core. all this after draining coolant. should take about 20 min.