Honda Civic Service Manual page 1382

Troubleshooting -'96 - 98 Models
Symptom Chart
NOTE;
. Check the engine coolant level. and allow the engine to warm up before troubleshooting.
. Any abnormality must be corrected before continuing the test.
. Because of the precise measurements needed. use a multimeter when testing.
o Before performing any troubleshooting procedures check:
- Fuses No. 41 11.5 Al, No. 55 (40 A) in the under-hood fuse/relay box. and No. 17 (7.5 A) in the under-dash fuse/relay
box
-
Grounds No. G401, G402
- Cleanliness and tightness of all connectors
Symptom Romedy
Hot air flow is low. Blower motor runs. but one or more
speeds are inoperative.
Perform the procedures in the flowchart (see page 21-8).
Blower runs properly.
Check for the following:
. Clogged heater duct
. Clogged heater outlet
. Incorrect door position
No hot air flow.
Blower motor does not run at all,
Perform the procedures in the flowchart (see page 21-10).
Blower motor runs. Check for the following:
. Clogged heater duct
. Clogged blower outlet
. Clogged heater valve
. Faultv air mix door
. Heater valve cable adjustment (see page 21-44)
. Air mix control cable adiustment (see page 2'l-441
. Faulty cooling system thermostat (see section 10)
. Clogged evaporator (with air conditioning)
. Frozen evaporator {with air conditioning)
Mode control motor does not run, or one or more modes
are inooerative.
Perform the procedures in the flowchart (see page 21-13).
Recirculation control door does not chanqe between
FRESH and RECIRCULATE.
Perform the procedu.es in the flowchan (see page 21-16).
Both heater and A,/C do not work.
Perform the procedures in the flowchart (see page 21-18),
21-6