Honda Civic 1998 Service Manual page 1037

Troubleshooting
Symptom Ghart
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.
. Before performing any troubleshooting procedures checkl
._ Fuses *1No. 47 \1 .5 A), *1No. 55 {40 A}, *,No. 17 (7.5 A)
-
G r o u n d s N o . G 4 0 1 , c 4 0 2
- Cleanliness and tightness of all connectors
*rr In the under-hood fuse/relay box
*' : In the under-dash fuse/relay box
Symptom
Remedy
Hot air flow is low. Blower motor runs, but one or more
speeds are inoperative.
Perform the procedures in the flowchan (see page 21 6).
Blower runs properly.
Check for the following:
. Clogged heater duct
. Clogged heater outlet
. lncorrect door position
No hot air flow. Blower motor does not run at all.
Perform the procedures in the flowchart (see page 21-8).
Blower motor runs.
Check for the following:
. Clogged heater duct
. Clogged blower outlet
. Clogged heater valve
. F a u l t y a i r m i x d o o r
. Heater valve cable adjustment (see page 21-23l,
' Air mix control cable adjustment (see page 21-23)
. 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 inoperative.
Perform the procedures in the flowchart (see page 21-l 1).
Recirculation control door does not chanqe between
FRESH and RECIRCULATE.
Perform the procedures in the flowchart (see page 2'l-14).
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21-4