Replace defective hydraulic cooling fan with electric cooling fan?

Tiny
JAMES.B.POTTER
  • MEMBER
  • 1994 LEXUS ES 300
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 295,000 MILES
Factory replacement hydraulic fan costs $750.00 from Japan. Not worth that. I see electric fan kits on the internet. I'm a reasonably competent mechanic. Need advice as to what to do with the hydraulic hoses no longer needed for the electric fan? Connect them together? Where is the temperature sensor installed on the block? What other issues with this job? Do you have a recommended set of parts from a supplier for this job? Thank you.
Thursday, June 1st, 2023 AT 3:33 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,787 POSTS
If you're considering replacing the factory hydraulic fan in your 1994 Lexus ES 300 with an electric fan kit, here are some suggestions and considerations:

Removal of the hydraulic fan: Before proceeding with installing an electric fan, you'll need to remove the existing hydraulic fan. This may involve disconnecting the hoses and removing any brackets or mounts that secure the fan assembly. Be sure to consult the vehicle's repair manual or seek online resources specific to your Lexus ES 300 for detailed instructions.

Dealing with the hydraulic hoses: Once the hydraulic fan is removed, you have a few options for the unused hydraulic hoses. One option is to securely cap them to prevent any leaks or debris from entering the system. Another option is to remove the hoses altogether but ensure that the remaining coolant lines are properly connected and sealed.

Electric fan installation: When installing an electric fan, you'll need to determine the appropriate location for mounting the fan and ensure it fits within the available space. Additionally, you may need to install a relay, fuse, and temperature sensor to control the electric fan's operation. The temperature sensor is typically installed on the engine block or radiator to monitor coolant temperature.

Parts and suppliers: There are various electric fan conversion kits available from different suppliers. It's recommended to research and choose a kit that is compatible with your Lexus ES 300 and provides the necessary components, such as the fan, wiring harness, relay, fuse, and temperature sensor. You can consult automotive parts retailers, online marketplaces, or specialty suppliers that offer aftermarket cooling system components.

Wiring and electrical connections: Proper wiring and electrical connections are crucial for the electric fan to function correctly. Follow the instructions provided with the fan kit and ensure that the wiring is securely connected, insulated, and protected from potential damage. It's advisable to consult wiring diagrams specific to your vehicle or seek the assistance of a qualified mechanic if you are unsure about the electrical connections.

Remember to thoroughly test the electric fan system after installation to ensure it operates as intended and effectively cools the engine. Monitoring the engine temperature during initial operation and subsequent drives is important to confirm the system's efficiency.
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Friday, June 2nd, 2023 AT 8:43 AM

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