How do I fix code P0645?
Depending on the diagnosis, common repairs for this code include:
- Replacement of the A/C clutch relay.
- Repair or replacement of faulty wiring.
- Repair or replacement of ground straps.
- Replacement of control module.
- Replacement of the blown fuse or fuse-able link (if applicable)
- Evacuate and recharging of the A/C system.
What is code P0645?
OBD-II Code P0645 is defined as a A/C Clutch Relay Control Circuit. The engine control module (PCM) uses a relay to control voltage to the A/C Compressor Clutch. The A/C clutch engages, allowing the Air Conditioning system to operate. When the PCM is unable to control the relay, code P0645 will set.
What controls the ac clutch?
When the driver requests AC, the system provides power to the clutch coil, thereby generating a magnetic field. When the clutch coil receives power and generates a magnetic field, it pulls a portion of the clutch plate against the clutch body/pulley, causing it to rotate the compressor shaft.
How do I fix code p1684?
Common repairs include:
- Properly connecting the battery.
- Replacement of the TCM.
- Repair or replacement of the TCM harness.
- Repair or replacement of faulty connection in the TCM circuit.
- Cleaning the battery terminals.
What are the symptoms of a bad AC relay?
No cold air. Another symptom that the AC relay has potentially failed is that there will be no cold air at all from the AC. If the relay fails, the compressor will not operate and the AC system will be unable to produce any cold air at all.
How do you know if your AC clutch is bad?
Listen for any internal buzzing or clicking from the clutch. If the clutch fails to engage and spin, but you hear electrical buzzing or clicks inside, it indicates an internal clutch short. Listen for excessive bearing noise coming from the clutch or compressor.
How do I Check my AC clutch?
An easy way to check your ac compressor clutch is to give it a carefully and lightly tap on the clutch when the compressor is running and the engine is on. Sometimes when the clutch gets worn out the disc is too thin and it may not engage properly.
Where is the AC clutch relay located?
“The AC clutch relay is located inside the cab on a metal bracket that is easiest to see when you remove the glove box compartment. The relay is on a metal bracket bolted to the top of the plastic air box, forward and to the center of the dash from glove box. There are three relays in a row on that bracket.