| Made this back in February just never posted it. Procedure does not replace heatercore pipes. After removing the heatercore I decided to completely remove the dash to replace the pipes as well. Hopefully this can be of help to someone. Heater Core Removal Without Removing the Dash: The heater core and its valve are a failure point in the cooling system. Neglected coolant systems will accelerate its failure. Symptoms of a failing heater core are fogged windows, wet carpet under the dash, smell of coolant in the cabin, or liquid dripping on your feet. This procedure does not require the removal of the dash so the vehicle will remain operational but without the use of the heater or air conditioner. If you operate the vehicle during this procedure secure the loose wiring harnesses and sensors under the dash away from the pedals. The following was performed on a left-hand drive 1995 300ZX Twinturbo 5 speed with automatic climate control. Special thanks to Paul Hewitt of Autoworx Pty Ltd for the tech article performed on a right-hand drive. Timing:
Do to limited space, the best time to replace the heater core is when you already have the dash out, but the following procedure circumvents this. Part Numbers:
heater hose inlet: 92400-30P00
heater hose outlet: 92410-30P00
heater core: B7140-30P0/27140-30P00 Special Tools:
right-angle screwdriver Procedure:
1. Disconnect the negative battery cable. You are disconnecting electrical harnesses this is a good precaution to take. 2. Remove the inlet and outlet heater hoses from the firewall to the manifold. I had to slice the hose along the length of the heater core pipes to accomplish this due to corrosion and deposits. 3. Bypass the heater core by connecting the two manifold coolant pipes together using 3/4" heater hose (1. includes T-fitting from Prestone Flush Kit). The car is operational at this point if you reconnect the battery.
 4. Remove the lower dash suede panel under the steering column (4 10mm/phillips)(2.).
 5. Remove the side vent duct (3 10mm/phillips, 1 phillips)(3.). You may have to remove the side vent panel by pulling on it (4 clips).
 6. Remove the floor vent duct (phillips and push tab). Attached to it are the aspirator/in-vehicle sensor (2 10mm/phillips) and foot duct sensor (4.).
 7. Unplug the 4 electrical harnesses and remove the A/C control box (2 small phillips)(5.). There are 2 channels at each side on the top securing it. Slide it upwards.
 Remove the control box mounting bracket (3 phillips) (6.).
 8. Disconnect tension spring from the side link (1 phillips). Disconnect the harness from the mode door motor (7.). Remove the mode door motor (2 phillips). Unlatch the control rod from the mode door motor by pushing down on the securing plastic clasp.
 9. Remove the heater core pipe cover (2 phillips). The upper screw requires the right angle screwdriver. 10. Remove the tension spring from the heater core valve and pull the tab securing the valve control cable. 11. Prepare to catch the coolant that comes out of the heater core. Disconnect the upper heater core pipe and valve assembly from the heater core using right-angle screwdriver (8 phillips). I ended up using a Roto-Zip to cut the valve assembly to save time. 12. Disconnect the valve assembly from the lower pipe unlatching it from the control cable (4 phillips). 13. Remove the accelerator bracket. 14. Remove the tab securing the heater core (1 phillips). 16. Push the upper pipe upward towards the firewall and the lower pipe forward. Pull heater core out.
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Heater Core Removal Without Removing the Dash - 
