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Heating and A/C Symptom Troubleshooting

Symptom
Diagnostic procedure
Also check for
Blower motor runs, but one or more speeds are inoperative
Cleanliness and tightness of all connectors
Blower motor does not run at all
  • Blown fuse No. 10 (7.5 A) and No. 57 (30 A) in the under-dash fuse/relay box
  • Poor ground at G501
  • Cleanliness and tightness of all connectors
A/C condenser fan does not run at all (but radiator fan runs with the A/C on)
  • Blown fuse No. 47 (30 A) in the under-dash fuse/relay box
  • Poor ground at G202
  • Cleanliness and tightness of all connectors
Both fans do not run with the A/C on (but the A/C compressor runs with the A/C on)
  • Blown fuse No. 30 (30 A) and No. 47 (30 A) in the under-dash fuse/relay box
  • Poor ground at G202
  • Cleanliness and tightness of all connectors
The A/C compressor clutch does not engage (but both fans run with the A/C on)
  • Blown fuse No. 43 (7.5 A) in the under-dash fuse/relay box
  • Cleanliness and tightness of all connectors
A/C system does not come on (both fans and the A/C compressor do not work); heater is OK
  • Poor ground at G502
  • Cleanliness and tightness of all connectors