* PCM (Powertrain Control Module): This is the "brain" of the system. It monitors engine temperature and other factors to determine when the fans need to run. It sends signals to activate the relays.
* Multiple Relays (often 2 or more): These relays are usually located in the underhood fuse box. They aren't specifically *labeled* "cooling fan relay," but their function is to switch the high- and low-speed circuits for the fans. You'll likely find relays associated with the A/C system and/or the radiator cooling fan(s). Their exact location and number will vary slightly depending on the year and specific model of Windstar.
* Fan Control Module (some years): Some Windstar models may have a dedicated fan control module that acts as an intermediary between the PCM and the relays.
To find the relays:
1. Consult your Windstar's owner's manual: This is the best place to find a fuse/relay diagram specific to your year and model.
2. Check the underhood fuse box diagram: The cover of the fuse box usually has a diagram showing the location and function of each fuse and relay. Look for relays related to "A/C," "radiator fan," or similar. You might need to consult a wiring diagram to confirm their function if the labels aren't clear.
3. Use a multimeter: If you're comfortable with basic electrical testing, you can use a multimeter to trace the circuit from the PCM to the fans to identify the relays involved. This is the most accurate method but requires some electrical knowledge and caution.
In short, there's no single "cooling fan relay." You'll need to examine your vehicle's documentation and/or use a multimeter to identify the relays responsible for switching the cooling fan circuits.
