Molly Ayala
The Chevy Silverado 1500 is a powerful truck with a range of engine options and configurations. One aspect that many owners and enthusiasts focus on is the cooling system, specifically the radiator fans. The Silverado 1500 can be equipped with dual electric fans, which provide improved engine cooling performance. These fans come in various sizes, such as 13.5 inches, 15 inches, and 16 inches in diameter, and offer different airflow capacities, typically ranging from 4,600 to 5,900 cubic feet per minute (cfm). The dual electric fans are controlled independently and can operate at different speeds, with some sources mentioning low and high settings, while others discuss variable speed control based on radiator temperature. Upgrading to dual electric fans can enhance engine performance and even improve fuel economy, making them a popular modification for Silverado 1500 owners.
| Characteristics | Values |
|---|---|
| Fan Diameter | 13.5 inches, 15 inches, 16 inches, 14 inches, 12 inches |
| Fan Material | Plastic, Aluminium, Nylon |
| Fan Colour | Black, Black/Natural |
| Fan CFM | 4,600, 5,500, 5,900, 2,600 |
| Fan Speed | Low, High |
| Fan Motor Amps | 22-25 |
| Motor Wattage | 500, 700 |
| Fan Position | Dual Radiator and Condenser Fan Assembly, Engine Cooling Fan, Engine Cooling Fan Motor |
| Fan Height | 12 inches, 19 inches, 13.875 inches, 14 inches, 17 inches, 17.5 inches, 18.85 inches, 26.25 inches |
| Fan Width | 12 inches, 14 inches, 14.75 inches, 27.5 inches, 28.5 inches, 31.875 inches, 34 inches, 38.25 inches, 41.75 inches |
| Fan Price | $50-$750 |
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What You'll Learn
Electric fan conversion kits
There are a variety of electric fan conversion kits available for the Chevy Silverado 1500, catering to different model years and specifications. For instance, the 2003-2013 Full Size GM Truck Electric Dual Fan Conversion Kit by PCM of NC is compatible with both LS1 fans and 05+ Full Size Electric Fans, also known as the "GT series". This kit includes the necessary wiring harness and brackets for installation, and the fans can be purchased separately.
Another option is the Chevy Truck Electric Fan Conversion Kit offered by TCP Performance, which includes a custom-built aluminium shroud, two 16" SPAL fans, a Davies Craig dual fan controller, and an inline radiator hose adapter. This kit is designed to fit radiators with a 34" core measurement and comes with a wiring diagram and instructions for programming the controller.
When considering an electric fan conversion kit, it's important to ensure compatibility with your specific Silverado 1500 model and engine configuration. For example, certain E78 ECM operating systems found in some 2011+ trucks may not support electric fans. Additionally, the size of your radiator will determine the type of fan that can be installed, with larger radiators accommodating the GT series fans, while smaller radiators may require LS1 fans or a custom shroud.
Furthermore, electric fan conversion kits offer improved fuel economy and engine performance by reducing the power demands of the cooling system. This can result in gains of up to 15-20 RWHP and an increase of around 1 MPG in fuel efficiency. The ability to independently control each fan also allows for more precise temperature management, ensuring that your Silverado 1500 maintains optimal operating temperatures.
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Fan speed control
The Chevy Silverado 1500 comes with dual electric fans, which can be set to low or high speed. The low setting runs both fans at 12v, which is half speed, while the high setting runs both fans at full blast.
It is important to note that the Silverado's electric fans require a custom tune to function properly, as the pins that control the fans in the PCM need to be activated through tuning software. Additionally, the size of the radiator may impact the compatibility of certain electric fans, so it is essential to measure the radiator before purchasing new fans.
For those with a 2001 Silverado, it is possible to install 2006 E-fans, but this requires additional wiring and a tune. The main power feed for the relay needs to be connected to the battery, and the ground needs to be secured to a factory bolt on the frame or body.
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Fuel economy improvements
Electric fans can improve fuel economy in Silverado 1500 trucks. The gains may not be huge, but every little helps when it comes to saving fuel.
One forum user with a 1999 Silverado xcab 5.3 reported an improvement from 14.5 mpg to 15.5 mpg with an electric fan. They noted that the fan clutch was engaged almost constantly, which was impacting their fuel mileage. In hot weather, the electric fan offered a small improvement.
Another forum user with a 2001 Silverado 4.8L 2WD 5-speed manual transmission truck reported installing dual fans from a 2005 Suburban. They noted that the fans run separately, with each having its own power, ground, relay, A/C sense wire, temperature sensor, and adjustable thermostat.
A dual fan conversion kit is available for 2003-2013 full-size GM trucks. It replaces the stock electro-viscous fan with two high-flow computer-controlled electric fans, resulting in fuel economy improvements of around 1 MPG.
It's worth noting that the cost of fuel also plays a role in the overall savings. The higher the fuel cost and the higher your mileage, the better the return on fuel economy improvements.
Additionally, proper maintenance and keeping the tires inflated correctly can also contribute to free MPG improvements.
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Fan size and radiator compatibility
The fan size and radiator compatibility of the Chevy Silverado 1500 depend on the model year and the type of radiator installed.
For the 2000-2004 Chevy Silverado 1500 with a 27 1/2-inch radiator core, a direct-fit bolt-on Flex-A-Lite dual electric fan system is available. This system includes two 13 1/2-inch electric fans and a variable speed controller that adjusts fan speed based on radiator temperature.
For the 2005 model year, the Chevy Silverado 1500 with the larger 34" radiator option can accommodate larger GT Series fans, while the smaller 28" radiator requires the use of LS1 fans or an upgraded Spal fan kit with a custom-made shroud.
The 2005 Chevy Silverado 1500 electric fans are available in two sizes: 13 1/2 inches and 15 inches in diameter. These fans operate at 12V for low speed and full blast for high speed, requiring 3 relays and 2 signal wires.
It is important to note that some Silverado owners have chosen to run their dual fans separately, with each fan having its own power source, ground, relay, A/C sense wire, temperature sensor, and adjustable thermostat. This setup provides complete redundancy for cooling and allows for independent control of each fan.
Additionally, when considering fan size and radiator compatibility, it is crucial to ensure that the alternator can handle the power demands of the electric fans. E-fans require a significant amount of power, so a high-output alternator may be necessary.
Overall, the fan size and radiator compatibility for the Chevy Silverado 1500 vary depending on the model year and radiator size. It is important to verify the specific dimensions and requirements for your vehicle before making any modifications or purchases.
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Wiring and installation
The Hihaha Dual Electric Fan Wiring Harness is a direct replacement for a broken fan wire harness in the Silverado 1500. The harness is also compatible with the Sierra 1500, 2500, and 3500 pickup trucks.
The installation process involves directly replacing the broken harness. The harness is designed to fit the 1999-2007 Silverado models, including the Avalanche, Suburban, and Tahoe variants. It is also compatible with the GMC Yukon and Sierra Yukon XL.
For those looking to upgrade their 1999-2002 GMT800 truck or SUV to the 05-06 GMT800 electric cooling fans, the process is a little more involved. First, you need to measure your radiator to ensure it is the larger, 34-inch size. If you have the smaller radiator, you will need to upgrade. The next step is to obtain the fans and the wiring harness from a 2005 or 2006 model, either from a junkyard or a pre-made harness from Blackbear Performance. The wiring harness will need to be cleaned up and added to the underhood fuse panel.
The relay wiring is as follows: 86-Green AC wire, 85-Ground, 87-Ground, and 30-Blue trigger wire on the OEM fan relay pack.
For those with a 2003 Silverado 1500 HD, the wiring is as follows: small green wire pinned in blue 42, and small blue wire pinned in 33 green. The power and ground are then connected.
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Frequently asked questions
Chevrolet Silverado 1500 electric fans are engine cooling fans that come in dual or single fan assemblies. They are available in a range of materials, colours, and sizes.
Dual electric fans improve fuel economy and increase horsepower. They also provide more effective cooling than a single fan, as each fan can be set to different speeds depending on the radiator temperature.
The fans have two speed settings: low and high. Both fans come on at low speed, sending 12v through both fans (6v to each). High speed means both are at full blast.
Yes, you can control the two fans separately using two separate fan controllers. This keeps the alternator from a high-demand kick if both fans turn on at the same time.
