|
The blower and the heater controls and the A/C system do not work |
Probable cause: HVAC control unit malfunction
|
|
|
|
|
|
Blown fuse No. B1 (7.5 A) in the under-dash fuse/relay box |
|
|
Poor ground at G506 |
|
|
Poor or loose connections at the terminals | |
|
The A/C compressor clutch and the A/C condenser/radiator fans are inoperative, but the blower and heater controls work |
|
|
Probable cause: A/C signal circuit malfunction
|
|
|
Probable cause: A/C pressure sensor circuit malfunction or evaporator temperature sensor circuit malfunction
Troubleshoot the A/C pressure sensor circuit: |
|
|
NOTE: The A/C pressure sensor circuit can malfunction without settind a DTC. |
|
|
|
|
|
|
|
|
Faulty evaporator temperature sensor |
|
|
Poor or loose connections at the terminals | |
|
The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work |
Probable cause: No power to the A/C compressor clutch
|
|
|
|
|
|
Blown fuse No. A17 (7.5 A) in the under-hood fuse/relay box |
|
|
Poor or loose connections at the terminals | |
|
The A/C condenser/radiator fans do not run at low speed with the A/C on, but the blower and heater controls work normally |
Probable cause: A/C condenser/radiator fan low speed circuit malfunction
|
|
|
|
|
|
|
|
|
Blown fuse No. A12-9 (MAIN FAN MTR) (30 A) in the under-hood fuse/relay box |
|
|
Poor ground at G301 |
|
|
Poor or loose connections at the terminals | |
|
The A/C condenser/radiator fans do not run at high speed, but do run at low speed with the A/C on |
Probable cause: Malfunction in the fan(s) high speed circuit
Do the following troubleshooting as needed:
|
|
|
|
|
|
|
|
|
Blown fuse No. A12-5 (SUB FAN MTR) (20 A) or No. A23 (7.5 A) in the under-hood fuse/relay box |
|
|
Poor ground at G301 |
|
|
Poor or loose connections at the terminals | |
|
The A/C compressor clutch cycles rapidly on and off |
Probable cause:
|
|
A/C system is overcharged (Excessive pressure on high side of system causing pressure sensor to turn A/C compressor off) |
|
|
Radiator and/or A/C condenser fan inoperative |
|
|
Low idle speed |
|
|
Low refrigerant charge | |
|
|
|
|
|
Faulty A/C pressure sensor | |
|
The blower airflow does not increase when the blower control dial is set to MAX. |
Probable cause: Blower request circuit malfunction
|
|
|
|
|
|
|
|
|
Poor or loose connections at the terminals |
|
|
Clogged or restricted dust and pollen filter | |
|
Insufficient heating |
|
1. |
|
|
2. |
|
|
3. |
Check the engine coolant temperature (ECT) during normal operation with the HDS |
|
4. |
Check the heater core inlet hose temperature: |
|
|
|
If it is COLD, check for restrictions in the hose, a damaged or leaking thermostat, or a damaged or leaking water pump |
|
|
|
|
|
5. |
|
|
6. |
|
|
7. |
Check the blower motor unit for obstructions |
|
8. |
Check for air leaks around the ducts and vents | |
|
|
|
|
|
Damaged cylinder head gasket | |
