Symptom Troubleshooting Index

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM TROUBLESHOOTING INDEX

Symptom	Diagnostic procedure	Also check for
Recirculation control doors do not change between Fresh and Recirculate	Recirculation control motor circuit troubleshooting (see RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors.
The blower motor does not run immediately even though the engine is fully warmed up	NOTE: The temperature control dial or button must be set between 64 °F (18°C) and 90°F (32°C) ECT Sensor circuit troubleshooting (see ECT SENSOR CIRCUIT TROUBLESHOOTING )	Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors
The climate control panel display does not work	Climate control panel circuit troubleshooting (see CLIMATE CONTROL PANEL CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors
The manual switch does not work	Manual controls circuit troubleshooting (see MANUAL CONTROLS CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors
Blower, heater controls, and A/C do not work	Climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown fuse No. 3 (7.5 A) in the driver's underdash fuse/relay box Poor ground at G401 Cleanliness and tightness of all connectors
Both fans do not run at low speed with the A/C on	Radiator and A/C condenser fan low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown fuse No. 58 (30 A) in the under-food fuse/relay box, and No. 3 (7.5 A) in the driver's underdash fuse/relay box Poor ground at G201 Cleanliness and tightness of all connectors
Both fans do not run at high speed with the A/C on when the engine coolant temperature is below 206 °F (97 °C) and the refrigerant pressure is above 1,520 kPa (15.5 kgf/cm² , 220 psi)	Radiator and A/C condenser fan high speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors
The A/C compressor clutch does not engage (but both fans run with the A/C on)	A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown fuse No. 59 (7.5 A) in the under-food fuse/relay box, and No. 3 (7.5 A) in the driver's underdash 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	A/C pressure switch circuit troubleshooting (see A/C PRESSURE SWITCH CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors