Electric Fans Installation Guide For Silverado

If you're looking to install electric fans on your Chevy Silverado, you've come to the right place. This modification is popular among Silverado owners who want to reduce noise, increase engine bay space, and improve their cooling system's performance. While it may seem like a daunting task, with the right tools and guidance, you can successfully upgrade your truck's cooling fans. In this step-by-step guide, we will cover everything from measuring your radiator to wiring and installing the electric fans, ensuring that you have a smooth and successful installation process.

Characteristics and Values Table for Installing Electric Fans on Silverado:

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Sizing up your radiator

When it comes to sizing up your radiator for your Silverado, there are a few key considerations to keep in mind. Firstly, it's important to measure your radiator accurately to determine its size. Radiators are typically measured by the core only, which means excluding the side channels. The width of the core is the critical dimension, as it determines the compatibility of the electric fans.

Some Chevy Silverado models have been equipped with different-sized radiators. For instance, certain trucks have been fitted with a smaller radiator, typically measuring around 28 inches wide, while others have a larger radiator that is approximately 34 inches wide. It's crucial to identify which size radiator your Silverado has before proceeding with the electric fan installation.

If you own a 1999-2002 GMT800 truck or SUV, it's likely that you have the smaller radiator. However, if you own a 2005-2006 model, your truck may have the larger radiator. It's important to confirm this by physically measuring the radiator core to ensure you select the correct electric fans for your vehicle.

Upgrading to a larger radiator may be an option if you currently have the smaller one and wish to install the 2005-2006 Tahoe/Silverado electric fans, which are designed for the larger radiator. This upgrade will involve additional work and expenses, but it may be a worthwhile modification if you're seeking improved cooling performance or wish to accommodate specific electric fans.

Additionally, when considering radiator size, it's important to think about the power draw of the electric fans you intend to install. For instance, 5/7 blade fans typically use 500-watt motors, while 7/9 blade fans use 700-watt motors. This increased power draw can impact your electrical system, so it may be necessary to upgrade your alternator to handle the additional load.

Wiring and relays

Once the radiator size is confirmed, the next step is to source the electric fans and the necessary wiring harness. These can often be found in junkyards or purchased online. It is recommended to get an OEM wiring harness complete with fan relays, which can be cleaned up and made to look neater with wire loom and electric tape. A pre-made harness from Blackbear Performance is also an option for an easier installation process. Alternatively, with the correct pigtails, a custom harness can be made.

The wiring process begins by connecting the main power feed for the relay to the battery. The ground should be secured to a factory bolt on the frame or body, typically near the horn mounting bracket. The wiring harness can then be clipped onto the side of the underhood fuse panel after removing its cover. It is important to ensure that the wiring harness is tidy and secure, using zip ties or factory wire looms to keep it in place.

The next step is to remove the air intake tube and the upper half of the fan shroud, which is typically held in place with bolts and plastic push rivets. The electric fan shroud can then be bolted in place, utilising the existing bolt holes in the radiator support. The fan itself can be bolted on using the same bolts as the radiator, and if necessary, replacement bolts can be sourced from a junkyard.

Finally, the wiring can be secured underneath, and the air intake tube reattached. It is worth noting that upgrading the alternator and ensuring it corresponds with the pulley and belt is essential to avoid potential squeaking and squealing issues. Additionally, some users have suggested upgrading the radiator for improved cooling performance.

Removing the air intake tube

To remove the air intake tube from your Chevy Silverado, you will need a few tools. It is important to gather these before you begin the removal process. You will need a socket set, screwdrivers (both a flathead and Phillips), and pliers.

Once you have gathered your tools, you can begin the removal process. First, disconnect the negative battery terminal. This is an important step to prevent any electrical problems. Next, locate and remove any clamps or screws that are holding the air intake tube in place. You may need to loosen the clamps with a screwdriver before removing them. With the clamps and screws removed, you can carefully remove the air intake tube from the air box. Be sure to check for any hidden clips or screws that may be holding the tube in place. Gently lift the tube away from the air box, being careful not to damage any nearby parts.

Once the air intake tube is removed, it is important to check the area for any dirt or debris. Make sure the area is clean before installing a new air intake tube. It is also important to note that skipping over any clips or screws during the removal process can make it more difficult to remove the air intake tube. Additionally, failing to disconnect the battery could lead to short circuits.

If you are installing a cold air intake tube, you will need to install the top of the air box and tube, tightening bolts and hose clamps. Connect your MAF sensor and snug all bolts throughout. Finally, reconnect the negative terminal of the battery.

Installing the fan

Installing electric fans on a Silverado requires careful preparation and a detailed step-by-step process. Firstly, it is essential to measure the radiator to determine its size. Some Silverado models have a smaller radiator (approximately 28 inches wide), while others have a larger radiator (approximately 34 inches wide). The size of the radiator will dictate the compatibility of the electric fans.

The next step is to source the appropriate electric fans. For Silverados with the larger radiator, the 05-06 Tahoe/Silverado electric fans are a suitable option, and they can be easily installed by bolting them into the existing fan shroud. However, for Silverados with the smaller radiator, an upgrade to the larger radiator is necessary before installing the electric fans.

Once the compatible electric fans have been acquired, the installation process can begin. It is recommended to refer to a mechanic or a professional for guidance if you are unsure about any steps. The first step is to disconnect the battery to ensure safety during the installation process. Then, remove the air intake tube and the upper half of the fan shroud, which is typically secured with bolts and plastic push rivets. This step exposes the area where the new electric fan shroud will be installed.

Now, carefully lower the new electric fans into the space previously occupied by the fan shroud. This step may require some adjustments to ensure the fans fit snugly around the radiator hoses. The electric fan shroud should rest on the radiator support and the "hooks" molded into the radiator tank, with the mounting holes aligning perfectly with the holes in the radiator support.

Finally, secure the electric fans in place by bolting them onto the radiator support. Reconnect the battery and ensure all wiring is securely fastened and tucked away. Refer to the electric fan's manual or seek professional advice to ensure proper wiring connections. Once the installation is complete, test the electric fans to ensure they are functioning correctly.

Finishing touches

Once you've installed your electric fans, there are a few finishing touches to consider. Firstly, ensure all wiring is secured and neatly organised. This includes using wire loom and electric tape to cover exposed wires, as well as zip ties to secure the wiring harness to the factory wire loom or the bottom of the radiator.

If you're using a fan controller kit, such as the Four Seasons part number 35879, connect it according to the manufacturer's instructions. This may include tying in support to activate a fan when the AC compressor turns on, helping to limit AC compressor head pressures.

If your truck has the 105-amp alternator, consider upgrading to the 130-amp or 145-amp version. This is especially important if you notice a significant voltage drop when both fans are on and idling.

Finally, if you're looking for additional performance gains, consider investing in headers, a tune-up, or long tubes instead of spending more on electric fans. This may provide more substantial improvements to your vehicle's power.

Frequently asked questions