Location: You'll find the AC compressor clutch relay in the underhood fuse box (also called the power distribution center). The exact location within that box varies slightly depending on the specific trim level of your G20, but it's usually clearly labeled. Look for labels mentioning "A/C," "AC Compressor," or a similar designation. The relay itself will likely be a standard automotive relay (typically 30-40 amp).
Important Note: Before you start swapping relays, it's crucial to troubleshoot further. A faulty compressor clutch relay is only one possible reason for an inoperative AC compressor. Problems could also be with:
* Low refrigerant: This is the most common cause of an AC system not working.
* Compressor itself: The compressor may have seized or failed internally.
* Pressure switch: A safety switch prevents the compressor from engaging if pressures are too high or low.
* Wiring harness: Damaged or corroded wires can interrupt the circuit.
* AC control unit: The in-cabin controls may have a fault.
Troubleshooting Steps (Before Relay Replacement):
1. Check refrigerant levels: Have a qualified mechanic check the refrigerant charge. A low charge is the most frequent cause.
2. Check fuses: Before looking at the relay, check any related fuses in the fuse box.
3. Listen for compressor engagement: With the AC on, listen carefully near the compressor. You should hear a slight click if the clutch engages. If you don't hear anything, the problem is unlikely to be just the relay.
4. Check for power at the relay: Using a test light or multimeter, verify power is reaching the relay when the AC is turned on.
Replacing the relay *might* solve the problem if it's faulty, but it's a less likely cause than others. If the relay is suspected, it's best to get a replacement of the same amperage rating. A bad relay can often be identified by visual inspection for obvious signs of damage.
