You would have to be more specific. Which relay are you looking for? Most relays are mounted under the hood along the firewall.
Check under dash
The starter relay on a 1999 Ford E350 V10 van is typically located in the engine compartment's fuse box. You can find the fuse box near the driver's side, close to the battery. The starter relay is often labeled in the fuse box cover, making it easier to identify. If you need to replace it, ensure you disconnect the battery first for safety.
In a 2006 Ford E350 van, the flasher relay is typically located in the fuse box. The main fuse box is found under the dashboard on the driver's side, near the steering column. You may need to remove a cover to access it, and the relay itself is usually labeled for easy identification. Always consult the vehicle's owner's manual for specific details and diagrams.
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You need to replace your Blower relay,
Under the dash board on the left side of the steering column.
In a 1988 Ford E350, the fan motor relay is typically located in the engine compartment, near the front of the vehicle. It is often mounted on or near the radiator support or within the fuse box area. You may need to consult the vehicle's service manual for exact placement and identification, as it can vary slightly based on the specific configuration of the van.
In the engine compartment there is a box (power distribution box)that has several fuses and relays in it. My owners guide says that it should be relay #3, but check the inside of the top to see if that is correct.
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bacon
The engine has to be removed.
It should be located under the dash on the drivers side.