Honda Civic Service Manual: Heater Unit/Core Removal and Installation (Heating)

Honda Civic Service Manual / HVAC / Heating / Heater Unit/Core Removal and Installation (Heating)

SRS components are located in this area. Review the SRS component locations and the precautions and procedures before doing repair or servicing.

1.	Vehicle Lift

Raise the vehicle on a lift, and make sure it is securely supported.

2.	Battery Terminal (SRS) - Disconnection

Make sure the ignition switch is in LOCK (0).

Disconnect and isolate the negative cable with the battery sensor (A) from the battery.

NOTE:

Always disconnect the negative side first.

To protect the battery sensor connector (B) from damage, do not hold it when removing the negative terminal.

Do not disconnect the battery sensor from the negative terminal (C).

Disconnect the positive cable (D) from the battery.

Wait at least 3 minutes before starting work.

3.	Radiator Cap

Wait until the engine is cool, then carefully remove the radiator cap.

4.	Radiator Coolant - Replacement

Loosen the drain plug (A), and drain the coolant.

5.	Wiper Arm Assembly (K24Z7 engine)

NOTE: Set the wiper arms to the auto-stop position before removal.

Remove the cowl top wiper covers (A).

Remove the wiper arms (B).

6.	Both Side Cowl Covers (K24Z7 engine)

Remove the side cowl cover (A).

The left side is shown; repeat on the right side.

7.	Center Cowl Cover (K24Z7 engine)

Remove the center cowl cover (A).

Disconnect the windshield washer tube (B).

If necessary, remove the hood rear seal (C).

8.	Under-Cowl Panel (K24Z7 engine)

Remove the under-cowl panel (A).

9.	Heater Hose - Body Side

NOTE:

Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on the electrical parts or the painted surfaces. If any coolant spills, rinse it off immediately.

Note the layout of the hose.

Disconnect the inlet heater hose (A).

Disconnect the outlet heater hose (B).

	3.	Remove the nut.
		NOTE: Take care not to damage or bend the fuel lines or brake lines, etc.

10.	Front Door Opening Seal As Needed Both

Remove front door opening seal (A) as needed.

Repeat on the opposite side.

11.	A-Pillar Trim Both

Pull out the A-pillar trim (A) to release the clips.

Put a shop towel (A) in the opening between the A-pillar trim (B) and the dashboard to prevent dropping the A-pillar clips.

	3.	Disconnect the connector (A), then remove the A-pillar trim (B).
		NOTE: The upper clip (C) will stay in the body.

Remove the upper clip (A) from the body.

Repeat on the opposite side.

12.	Driver's Dashboard Lower Cover

Remove the driver's dashboard lower cover (A).

13.	Both Front Door Sill Trims

Driver's side: Remove the cap (A) from the front door sill trim (B).

Driver's side: Remove the opener lock cylinder (C).

Driver's side: Remove the screw (A).

Driver's side

Passenger's side

Remove both front door sill trims (A).

14.	Both Kick Panels

Driver's side

Passenger's side

Pull out both front door opening seals (A) as needed.

Remove both kick panels (B).

15.	Glove Box - Move

Lower the glove box (A).

16.	M/T Shift Lever Knob

Except K24Z7 engine

Except K24Z7 engine: Lower the shift lever boot (A) to release the hooks from the boot.

Except K24Z7 engine: Remove the shift lever knob (B).

K24Z7 engine

K24Z7 engine: Lower the shift lever boot (A) to release the hooks from the boot.

K24Z7 engine: Loosen the shift lever boot ring (B).

K24Z7 engine: Remove the shift lever knob (C).

K24Z7 engine: Remove the shift lever boot ring.

17.	Center Console Panel

Detach the clips (A).

Remove the center console panel (B).

For some models: Disconnect the connector(s) (C).

18.	Center Console Panel Assembly (Except '12M M/T)

Detach the clips (A).

Remove the center console panel (A).

For some models: Disconnect the connector(s) (B).

19.	Cup Holder Panel Assembly

Remove the cup holder panel assembly (A).

20.	Center Console

Remove the bolts (A).

Disconnect the connector (B).

Remove the console box mat (A).

Remove the bolts (B).

Disconnect the connector (A).

Remove the center console (A).

21.	Rear Heater Joint Duct

Remove the rear heater joint duct (A).

22.	Driver's Airbag

Remove the access panel (A).

Disconnect the driver's airbag inflator connector (B) on the cable reel harness.

Disconnect the horn switch connector (C).

Remove the TORX bolts using a TORX T30 bit.

Remove the driver's airbag (A).

23.	Steering Wheel Assembly

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Set the front wheels in the straight ahead position.

Disconnect the connector (A).

Loosen the steering wheel bolt (B) three turns.

Install a commercially available steering wheel puller (A) on the steering wheel (B).

Free the steering wheel from the steering column shaft by turning the pressure bolt (C) of the puller.

Note these items when removing the steering wheel:

Do not tap on the steering wheel or the steering column shaft when removing the steering wheel.

If you thread the puller bolts (D) into the wheel hub more than five threads, the bolts will hit the cable reel and damage it. To prevent this, install a pair of jam nuts five threads up on each puller bolt.

Remove the steering wheel puller.

Remove the steering wheel (A) from the steering column.

24.	Upper Column Cover

Remove the upper column cover (A).

25.	Lower Column Cover

Remove the screws (A).

Remove the lower column cover (A).

26.	Combination Switch Body Assembly

Disconnect the connectors (A).

Remove the clip (B).

Disconnect the connectors (A).

Without steering lock

With steering lock

Remove the combination switch body assembly (A) from the steering column shaft.

27.	Steering Joint Cover

Remove the steering joint cover (A).

28.	Steering Column Lower Slide Shaft - Hold

Set the steering column to the center tilt position, and to the center telescopic position.

Hold the lower slide shaft (A) on the column with a piece of wire (B) between the joint yoke (C) of the lower slide shaft and the joint yoke (D) of the upper shaft to prevent the lower slider shaft from pulling out.

29.	Steering Joint - Disconnection

Remove the steering joint bolt (A).

Disconnect the steering joint (B) from the pinion shaft.

NOTE:

If the center guide (C) is in place and has not moved, leave it in place.

If the center guide has come off, discard it.

30.	Steering Column

With steering lock: Disconnect the connectors (A) from the ignition switch (B).

Without steering lock

With steering lock

Detach the wire harness clips (C) from the steering column.

	3.	Remove the steering column (D).
		NOTE: Do not release the lock lever until the steering column is installed. If the lock lever is released before installation, adjust the steering column after installation.

31.	A-Pillar Corner Trim Both

Remove both A-pillar corner trims (A).

32.	Dashboard/Steering Hanger Beam

Disconnect the connector (A).

Disconnect the connectors (A).

Remove the bolts (A, B) from under the dash.

With climate control: Remove the aspirator hose (A).

Disconnect the connectors (A).

Remove the bolts (B).

Disconnect the connector (A).

Remove the caps (A).

10.

Loosen the special bolts (B) until they disengage from the threads on the hanger beam side brackets (C), and engage the inside threads of the collar bolts (D). The thread lock on the special bolts makes the special bolts and the collar bolts turn together.

11.

Continue to loosen the special bolts to turn the collar bolts into the fixed space adjusters (E) until the collar bolts engage the adjuster brackets. This creates a gap (F) between the collar bolts and the body.

12.

Remove the special bolts.

	13.	Check that the collar bolts (A) are seated in the fixed space adjusters (B).
		NOTE: If either collar bolt was not seated, replace the special bolts.

14.

Remove the caps (A).

15.

Remove the bolts (B).

16.

Remove the dashboard (A).

33.	Blower-Heater Unit

Disconnect the connector (A).

Remove the blower-heater unit (A).

34.	Heater Unit Wire Harness

Remove the blower motor cover (A).

Disconnect the connector (B).

Remove the harness clip (C).

Disconnect the connector (A).

Remove the clips (B).

Disconnect the connectors (A).

Disconnect the connector (A).

Remove the harness clip (A).

35.	Blower Unit

Remove the blower unit (A).

36.	Passenger's Heater Duct

Remove the passenger's heater duct (A).

37.	Heater Core Cover

Remove the heater core cover (A).

38.	Expansion Valve Cover

Remove the expansion valve cover (A) and the seal (B).

39.	Heater Core

Remove the heater pipe bracket (A).

Remove the grommet (B).

Carefully pull out the heater core (C).

SRS components are located in this area. Review the SRS component locations and the precautions and procedures before doing repair or servicing.

NOTE:

Do not interchange the inlet and outlet heater hoses, and install the hose clamps securely.

Make sure that there is no coolant leakage.

Make sure that there is no air leakage.

1.	Heater Core

Carefully install the heater core (A).

Install the grommet (B).

Install the heater pipe bracket (C).

2.	Expansion Valve Cover

Install the expansion valve cover (A) and the new seal (B).

3.	HEATER CORE COVER

Install the heater core cover (A).

4.	Passenger's Heater Duct

Install the passenger's heater duct (A).

5.	Blower Unit

Install the blower unit (A).

6.	Heater Unit Wire Harness

Connect the connector (A).

Install the harness clip (B).

Connect the connectors (A).

Connect the connector (A).

Install the clips (B).

Connect the connector (A).

Install the harness clip (B).

Install the blower motor cover (C).

7.	Blower-Heater Unit

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Install the blower-heater unit (A).

Connect the connector (A).

8.	Dashboard/Steering Hanger Beam

Special bolt tightening on passenger's side

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NOTE:

Make sure the collar bolts (A) turn easily by hand in the fixed space adjusters (B). Tighten the collar bolts by hand until they engage the fixed space adjusters before reinstalling the dashboard.

Before reinstalling the dashboard, screw the special bolts (C) into the collar bolts, and check that they turn together. If they do not turn together, replace the special bolts.

Install the dashboard (A).

Install the bolts (A).

Install the caps (B).

Install the special bolts (A).

Install the caps (B).

Connect the connector (A).

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Connect the connectors (A).

Install the bolts (B).

10.

With climate control: Install the aspirator hose (A).

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11.

Install the bolts (A, B) under the dash.

12.

Connect the connectors (A).

13.

Connect the connector (A).

9.	A-Pillar Corner Trim Both

Install both A-pillar corner trims (A).

10.	Steering Column

	1.	Install the steering column (A).
		NOTE: Do not release the lock lever until the steering column is installed. If the lock lever is released before installation, adjust the steering column after installation.

Without steering lock

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With steering lock

Loosely tighten the attaching nuts and bolts.

Tighten the attaching nuts and bolts to the specified torque in the sequence shown.

Install the wire harness clips (B) to the steering column.

With steering lock: Connect the connectors (C) to the ignition switch (D).

11.	Steering Joint - Reconnection

Set the rack in the straight ahead driving position.

Slip the lower end of the steering joint (A) onto the pinion shaft (B).

NOTE:

Pinion shaft with center guide: Install the steering joint by aligning the center guide (C).

Pinion shaft without center guide: Position the steering column by aligning the gap (D) within the angle.

Align the bolt hole (A) on the steering joint with the groove (B) around the pinion shaft.

Loosely install the steering joint bolt (C).

Be sure that the joint bolt is securely in the groove in the pinion shaft.

Pull on the steering joint to make sure that the steering joint is fully seated.

12.	Steering Column Lower Slide Shaft - Release

Cut the wire (A).

13.	Steering Joint Cover

Install the steering joint cover (A) in the sequence shown.

14.	Combination Switch Body Assembly

Without steering lock

With steering lock

Install the combination switch body assembly (A).

Tighten three screws (B) in the sequence shown.

Connect the connectors (A).

Install the clip (B).

15.	Lower Column Cover

Install the lower column cover (A).

Install the screws (A).

16.	Upper Column Cover

Install the upper column cover (A).

17.	Steering Wheel Assembly

Make sure the front wheels are pointing straight ahead.

Center the cable reel (A). Do this by first rotating the cable reel clockwise until it stops.

Rotate the cable reel counterclockwise about three full turns. The arrow mark (B) on the cable reel label should point straight up.

Position the steering wheel hub (A) so that it engages the pin (B) of the cable reel.

	5.	Install the steering wheel (C) on to the steering column shaft.
		NOTE: Do not tap on the steering wheel or the steering column shaft when installing the steering wheel.

Install the steering wheel bolt (A), and tighten it to the specified torque.

Connect the connector (B).

Make sure the wire harness is routed and fastened properly.

18.	Driver's Airbag

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NOTE: If you are replacing a deployed driver's airbag, inspect the cable reel for heat damage. If there is any damage, replace the cable reel.

Place the driver's airbag (A) in the steering wheel.

	2.	Tighten the new TORX bolts using a TORX T30 bit.
		NOTE: Make sure the clearance (B) between the steering wheel and horn pad is the specified value.

Connect the driver's airbag inflator connector (A) on the cable reel harness.

	4.	Connect the horn switch connector (B).
		NOTE: After reconnecting the negative cable to the battery, make sure the horn works properly.

Install the access panel (C).

19.	Rear Heater Joint Duct

Install the rear heater joint duct (A).

20.	Center Console

Install the center console (A).

Connect the connector (A).

Install the bolts (A).

Install the console box mat (B).

Connect the connector (A).

Install the bolts (B).

21.	Cup Holder Panel Assembly

Install the cup holder panel assembly (A).

22.	Center Console Panel Assembly (Except '12M M/T)

For some models: Connect the connector(s) (A).

Install the center console panel (B).

Install the clips (A).

23.	Center Console Panel

For some models: Connect the connector(s) (A).

Install the center console panel (B).

Install the clips (C).

24.	M/T Shift Lever Knob

Except K24Z7 engine

	1.	Except K24Z7 engine: Install the shift lever knob (A).
		NOTE: Tighten the shift lever knob until the shift pattern is properly aligned.

Except K24Z7 engine: Connect the shift lever boot (B).

K24Z7 engine

K24Z7 engine: Install and turn the shift lever boot ring (A) until it reaches the bottom of the threads on the shift lever.

K24Z7 engine: Turn the shift lever knob (B) until the shift lever knob contacts the shift lever boot ring.

K24Z7 engine: Tighten the shift lever boot ring and the shift lever knob together with the shift pattern properly aligned.

K24Z7 engine: Connect the shift lever boot (C).

25.	Glove Box - Move

Install the glove box (A).

26.	Both Kick Panels

Driver's side

Passenger's side

Install both kick panels (A).

Install both front door opening seals (B) as needed.

27.	Both Front Door Sill Trims

Driver's side

Passenger's side

Install both front door sill trims (A).

Driver's side: Install the screw (A).

Driver's side: Install the opener lock cylinder (A).

Driver's side: Install the cap (B) to the front door sill trim (C).

28.	Driver's Dashboard Lower Cover

Install the driver's dashboard lower cover (A).

29.	A-Pillar Trim Both

Carefully install the new upper clip (A) to the A-pillar trim (B).

Connect the connector (A).

Fit the clips into the holes in the A-pillar.

Lightly push the A-pillar trim (B) into place, then install the trim.

NOTE:

Make sure the side curtain airbag is not tucked under the clips or the trim ribs.

Do not push too hard on the A-pillar trim. If you push too hard, the clip will be damaged, and it will not hold the trim properly.

Gently tug on the A-pillar trim to verify that all clips are securely fastened.

Repeat on the opposite side.

30.	Front Door Opening Seal as Needed Both

Install front door opening seal (A).

Repeat on the opposite side.

31.	Heater Hose - Body Side

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	1.	Install the nut.
		NOTE: Take care not to damage or bend the fuel lines or brake lines, etc.

Connect the inlet heater hose (A).

Connect the outlet heater hose (B).

32.	Under-Cowl Panel (K24Z7 engine)

Install the under-cowl panel (A).

33.	Center Cowl Cover (K24Z7 engine)

If necessary, install the hood rear seal (A).

Connect the windshield washer tube (B).

Install the center cowl cover (C).

34.	Both Side Cowl Covers (K24Z7 engine)

Install the side cowl cover (A).

The left side is shown; repeat on the right side.

35.	Wiper Arm Assembly (K24Z7 engine)

NOTE: Set the wiper arms to the auto-stop position before installation.

Install the wiper arms (A).

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Install the cowl top wiper covers (B).

36.	Battery Terminal (SRS) - Reconnection

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NOTE: If the battery performs abnormally, test the battery.

Clean the battery terminals.

	2.	Connect the positive cable (A) to the battery.
		NOTE: Always connect the positive side first.

	3.	Connect the negative cable and the battery sensor (B) to the battery.
		NOTE: To protect the battery sensor connector (C) from damage, do not hold it when installing the negative terminal.

Apply multipurpose grease to the terminals to prevent corrosion.

37.	Radiator Coolant - Replacement

Follow the chart and pour coolant into the radiator up to the base of the filler neck.

NOTE:

Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda coolant can result in corrosion, causing the cooling system to malfunction or fail.

Honda Long Life Antifreeze/Coolant Type 2 is a mixture of 50 % antifreeze and 50 % water. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100 % concentration coolant. Do not add water to either coolant.

If the vehicle is regularly driven in very low temperatures (below -22 °F ( -30 °C)), a 60 % concentration of coolant should be used.

Operation	Vehicle Usage (Desired Mixture)	Current Mixture	Coolant Drain	Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100 % concentrate)	Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50)
Coolant Change	Normal Area (50/50)	50/50 60/40 unknown	Drain radiator, engine block, and reservoir	None	Top off the cooling system
	Very Cold Area (60/40)	50/50 unknown	Drain radiator, engine block, and reservoir	About 1.3 L (44 fl oz)
	Very Cold Area (60/40)	60/40	Drain radiator, engine block, and reservoir	About 1.2 L (41 fl oz)
Engine Overhaul	Normal Area (50/50)	-	-	None
Engine Overhaul	Very Cold Area (60/40)	-	-	About 1.2 L (41 fl oz)
Coolant Winterizing	Very Cold Area (60/40)	50/50	Drain about 2.0 L (68 fl oz) from radiator	About 1.2 L (41 fl oz)
Coolant Winterizing	Very Cold Area (60/40)	unknown*	Drain radiator, engine block, and reservoir	About 1.2 L (41 fl oz)

*: When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system.

Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal))

Except K24Z7 engine
	Manufacturer	Capacity
At Coolant Change	DENSO	5.59 L (1.477 US gal)
At Coolant Change	TRAD	5.50 L (1.453 US gal)
After Engine Overhaul (M/T)	DENSO	6.42 L (1.696 US gal)
After Engine Overhaul (M/T)	TRAD	6.33 L (1.672 US gal)
After Engine Overhaul (A/T)	DENSO	6.56 L (1.732 US gal)
After Engine Overhaul (A/T)	TRAD	6.47 L (1.709 US gal)
After Engine Overhaul (CVT)	DENSO	6.52 L (1.722 US gal)
After Engine Overhaul (CVT)	TRAD	6.43 L (1.699 US gal)

Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal))

K24Z7 engine
	Capacity
At Coolant Change	5.5 L (1.45 US gal)
After Engine Overhaul	6.7 L (1.78 US gal)

38.	HDS DLC - Connection

Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.

Turn the ignition switch to ON (II).

Make sure the HDS communicates with the vehicle. If it does not communicate, go to the DLC circuit troubleshooting.

39.	DTC - Clear

Clear the DTC(s) by following the screen prompts on the HDS.

Turn the ignition switch to LOCK (0), then wait for 10 seconds.

40.	Confirm Proper SRS Operation

Turn the ignition switch to ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

41.	VSA Sensor Neutral Position - Memorization

Park the vehicle on a flat and level surface, with the steering wheel in the straight ahead position.

	2.	Select VSA ADJUSTMENT, then select ALL SENSORS with the HDS, and follow the screen prompts.
		NOTE: See the HDS Help menu for specific instructions.

42.	Steering Angle Sensor Neutral Position - Clear

	1.	Select EPS ADJUSTMENT, then select EPS STEERING ANGLE SENSOR VALUE CLEAR and follow the screen prompts on the HDS.
		NOTE: See the HDS Help menu for specific instructions.

43.	Maintenance Minder Reset

After doing all procedures, select the individual maintenance item you wish to reset with the HDS..

Heating

...

Heater Unit/Core Removal and Installation (Natural Gas models)

Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat. ...

Honda Civic Service Manual: Heater Unit/Core Removal and Installation (Heating)

Heating

Heater Unit/Core Removal and Installation (Natural Gas models)

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