How to remove & replace center AC / heater vent in 2001 Honda Civic ?

I don't think your radio has anything to do with them not working, check you fuses.

HONDA CIVIC 2001 2005 Workshop SERVICE MANUAL

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Inside the dash ductiong about center of dash. You must remove the dash to get at it.

To remove and installing the Heater Core, check this procedure...

1. Disconnect and plug the heater hoses at the firewall.
2. Disconnect the heater valve control cable.
3. Remove the heater unit attaching nut on the firewall.
4. Remove the dashboard as follows:
   1. Remove the center panel.
   2. Disconnect the wire connectors at the fuse box.
   3. Disconnect the sunroof switch connector, if equipped.
   4. Disconnect the ground cable at the right of the steering column and the power mirror switch wire connector.
   5. Remove the side air vent knob and face plate.
   6. Remove the screws attaching the air vent control lever.
   7. Remove the center panel, radio and heater control head.
   8. Remove the gauge upper panel (4-door) or instrument panel (3-door).
   9. Disconnect the speedometer cable.
   10. Remove the center upper lid.
   11. Remove the side defroster garnishes on both ends of the dash.
   12. Lower the steering column.
   13. Remove the dashboard mounting bolts.
   14. Lift and remove the dashboard assembly.

1. Remove the heater duct.

Fig. 1: Removing the heater duct assembly

1. Remove the steering column bracket and duct assembly.
2. Remove the heater assembly mounting bolts.
3. Remove the heater assembly and remove the heater core.

Fig. 2: Removing the heater case assembly

Fig. 3: Removing the heater core from the heater case


Hope this helps (remember to rate this answer).

1. Make sure the dimmer switch (dash lights level selector) is not pushed all the way up. If not, check the buttons on the door jan (driver and passenger) to ensure they are not stuck "in". If so, you may need to remove these and try to "free" them from their stuck position.
Let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert @ Fixya.com

Does the heater blow cold air from the vents or do you mean the there is no airflow from the vents? cold air from the dash vents when the heater control valve is set fully hot could be an air pocket in the cooling system. The radiator sits slightly lower than the engine causing air pockets to get trapped in the engine when you replace the coolant. you'll have to purge the cooling system to restore flow to the heater core. No airflow (blower motor inop) this could be a bad blower motor transistor. pin test the blower motor circuit.

In my 1998 Honda Accord Lx the hot air does not come out of the heater vents in the floor, the same is true for cold air in the middle vents on the dash. The side vents on the dash work fine.

Have replaced my heater core in my 2001 regular cab 4wd in december 2009. Had to pull the complete dash including the complete metal dash behind the dash that you see. Also had to remove the right passenger side inner fender well to acess the remaining two bolts that hold the heater core cover to the firewall. Its an insane job to do but the repair shop books call for 9 1/2 hrs to do the job. I'm not an expert but this is what it takes.

In 96-98 Civics the dimmer simply pushes in under the left dash vent and is held in place on both sides by metal flexing tabs (no screws). If it were possible to grab it you could pull it straight out with a bit of rocking / side to side motion to help to release it. Unfortunately the proper way to remove it requires removing the lower panel as follows:

You need to remove the plastic cover panel that is underneath the steering column (the one with the switches, coin pocket, and fuse box cover built in). To do this you remove three screws (one above the switches on the upper left, one in the lower left corner, and one on the lower right. You will then need to pull the bottom edge out slightly from the dash and tug the entire panel down towards the floor of the car as gently as possible. You will be pulling out three metal snap-in retainers at the top of the panel, two on the left and one on the right. It is often hard to remove plastic panels without damaging them so be careful. Now unplug the switches (mirror, sunroof, fog light) and set the panel aside. At this point you can easily reach behind the dimmer switch, push it out, pull it through the front of the dash, and unplug it.

Hope this helps

Heater Core Honda Civic/CRX/del Sol 1984-1995 Repair Guide REMOVAL&INSTALLATION
See Figures 1, 2 and 3
REMOVAL & INSTALLATION

1. Disconnect the negative battery cable and disable the SRS system (if equipped.)

WARNING All SRS wire harnesses are covered with a yellow insulation. Read the SRS precautions found in this section and install the short connectors as described.

1. Properly drain the cooling system.
2. Disconnect and plug the heater hoses at the firewall.
3. Disconnect the heater valve control cable.
4. Remove the heater unit attaching nut on the firewall.
5. Remove the dashboard as follows:
   1. Remove the center panel.
   2. Disconnect the wire connectors at the fuse box.
   3. Disconnect the sunroof switch connector, if equipped.
   4. Disconnect the ground cable at the right of the steering column and the power mirror switch wire connector.
   5. Remove the side air vent knob and face plate.
   6. Remove the screws attaching the air vent control lever.
   7. Remove the center panel, radio and heater control head.
   8. Remove the gauge upper panel (4-door) or instrument panel (3-door).
   9. Disconnect the speedometer cable.
   10. Remove the center upper lid.
   11. Remove the side defroster garnishes on both ends of the dash.
   12. Lower the steering column.
   13. Remove the dashboard mounting bolts.
   14. Lift and remove the dashboard assembly.
6. Remove the heater duct.

Fig. 1: Removing the heater duct assembly

1. Remove the steering column bracket and duct assembly.
2. Remove the heater assembly mounting bolts.
3. Remove the heater assembly and remove the heater core.

Fig. 2: Removing the heater case assembly Fig. 3: Removing the heater core from the heater caseTo install:

1. Install the heater core into the heater unit.
2. Install the heater assembly and the attaching bolts.
3. Install the heater duct and steering column bracket.
4. Install the dashboard assembly. Tighten the mounting bolts until just snug.
5. Raise and attach the steering column.
6. Install the center upper panel.
7. Connect the speedometer cable and install the instrument gauge assembly.
8. Install the control head, radio and center panel.
9. Install the side vent and face plate.
10. Connect the ground cable at the right of the steering column and the power mirror switch wire connector.
11. Connect the sunroof switch connector, if equipped.
12. Connect wire connectors at fuse panel.
13. Install the heater unit attaching nut on the firewall.
14. Connect the heater valve control cable.
15. Connect the heater hoses at the firewall.
16. Connect the negative battery cable.
17. Fill, bleed and leak check the cooling system.