Climate Control Symptom Troubleshooting

NOTE: Before performing symptom troubleshooting, check for body and power train DTCs.

Symptom Diagnostic procedure Also check for 
Recirculation control doors do not change between Fresh and Recirculate Recirculation control motor circuit troubleshooting 
  • DTCs.
  • Blown fuse No. 30 (7.5A) in the under-dash fuse/relay box
  • Cleanliness and tightness of all connectors
 
Both heater and A/C do not work Climate control power and ground circuits troubleshooting 
  • DTCs.
  • Blown fuse No. 30 (7.5A) in the under-dash fuse/relay box
  • Poor ground at G503
  • Cleanliness and tightness of all connectors
 
Condenser fan does not run at all (but radiator fan runs with the A/C on) Condenser fan circuit troubleshooting 
  • DTCs.
  • Blown fuse No. 9 (20A) in the under-hood fuse/relay box, and No. 30 (7.5A) in the under-dash fuse/relay box
  • Poor ground at G201
  • Cleanliness and tightness of all connectors
 
Both fans do not run with the A/C on
(but the compressor runs with the A/C on) 		Radiator and condenser fans common circuit troubleshooting 
  • DTCs.
  • Blown fuse No. 9 (20A) and No. 4 (20A) in the under-hood fuse/relay box, and No. 30 (7.5A) in the under-dash fuse/relay box
  • Cleanliness and tightness of all connectors
 
Compressor clutch does not engage
(but both fans run with the A/C on) 		Compressor clutch circuit troubleshooting 
  • DTCs.
  • Blown fuse No. 12 (7.5A) in the under-hood fuse/relay box, and No. 30 (7.5A) in the under-dash fuse/relay box
  • Cleanliness and tightness of all connectors
 
A/C system does not come on
(both fans and compressor are inoperative) 		A/C Pressure switch circuit troubleshooting 
  • DTCs.
  • Cleanliness and tightness of all connectors
 
Blower fan runs slower than expected in cold weather ECT Troubleshooting Power train DTCs.