Where is the AC relay located under hood of an 1990 Dodge Spirit 3.0L engine?

There isn't a single, universally located "AC relay" in a 1990 Dodge Spirit 3.0L. The AC system's control is more complex and spread across several components, including relays and the under-dash control unit. You'll likely find several relays related to the AC compressor's operation. These are usually in one of the following locations in the under-hood fuse/relay center:

* Fuse/Relay Box: The most common place. The box itself might be on the fender or near the battery. Look for a diagram on the inside of the cover to identify relays related to the A/C compressor (often labeled "A/C," "Compressor," or with a similar designation).

* Individual Relays Mounted Elsewhere: While less common, some components may have their own dedicated relay mounted nearby.

To find the relevant relays:

1. Locate the under-hood fuse and relay center: This is typically a black plastic box with several fuses and relays.

2. Consult your owner's manual: The best resource. It will have a diagram showing the fuse and relay layout.

3. Look for a diagram on the inside of the fuse/relay box cover: Often printed on the underside of the cover.

4. Use a multimeter (if comfortable): With the key on, you can probe the various relays to see which one controls power to the AC compressor clutch. Caution: Be extremely careful working around automotive electrical systems.

Without the diagram from your owner's manual, precisely pinpointing the location is impossible. It's best to use the manual or the diagram on the box cover to avoid damaging other components.