To find it, you'll need to:
1. Consult your owner's manual: While it might not pinpoint the exact location of the relay, your owner's manual should have a diagram of the fuse box and/or relay center.
2. Use a wiring diagram: A wiring diagram specific to your 1990 Buick Skylark will show the location and circuit for the cooling fan relay. You can often find these diagrams online through auto parts websites or repair manual providers like Haynes or Chilton. Search specifically for "1990 Buick Skylark wiring diagram cooling fan."
3. Look in the underhood fuse box: This is the most common location for relays. The fuse box usually has a cover with a diagram showing the fuse and relay positions. Look for relays marked "fan," "cooling fan," or those with a corresponding amperage that suggests a high-power component like a fan.
4. Check near the battery or firewall: Sometimes, relays are mounted in a separate box or on a bracket near the battery or firewall. These are often less organized than the main fuse box.
5. Trace the wiring: If you can locate the wiring harness that goes to the cooling fan motor, you can follow it back to the relay. This is more time-consuming but can be effective.
Important Note: Always disconnect the negative battery terminal before working on electrical components. Incorrectly identifying or replacing relays can cause further electrical damage. If you're not comfortable working with car electrical systems, it's best to take your Skylark to a qualified mechanic.
