Replacing the windshield on a 2021 Toyota Highlander 4-door utility vehicle is typically a job best handled by a professional auto glass technician or a certified auto glass shop. Here’s a general overview of the process:

1. Assessment: The technician will assess the condition of the existing windshield to determine if it can be repaired or if a full replacement is necessary.

2. Gather Supplies: The necessary supplies are gathered, including the replacement windshield, automotive-grade sealant, and any additional materials or parts needed.

3. Safety Precautions: Safety measures are taken, such as wearing safety glasses, gloves, and other personal protective equipment.

4. Removal of Old Windshield:

   • The old windshield is carefully removed using specialized tools designed to cut through the sealant holding it in place.
   • Care is taken to avoid any damage to the vehicle’s frame, paint, or interior during the removal process.

5. Cleaning and Preparation:

   • The area where the new windshield will be installed is thoroughly cleaned to ensure a proper seal.
   • Any rust, corrosion, or contaminants are addressed to ensure a smooth and secure fit.

6. Installation of New Windshield:

   • The new windshield is positioned and adhered in place using suitable automotive-grade sealant. This sealant creates a waterproof and airtight bond.
   • Excess sealant is typically removed, and the installation is inspected to ensure it’s flush and secure.

7. Curing Time:

   • The sealant requires time to cure and set properly. The curing time can vary depending on the type of sealant used.

8. Clean-Up and Inspection:

   • The technician should inspect the work to ensure there are no issues with the seal, alignment, or any damage to the vehicle’s exterior or interior.

9. Testing:

   • The new windshield is tested to ensure it is properly sealed, and there are no leaks or issues with visibility.

10. Interior Cleaning: Any debris or dirt that entered the vehicle during the replacement is cleaned from the interior.

Selecting a reputable auto glass service or technician with experience working on Toyota Highlander models, specifically the 2021 model, is crucial. Proper installation is vital for your safety and the structural integrity of your Toyota Highlander. It’s also important to ensure that the replacement windshield is compatible with the vehicle’s make and model to ensure a proper fit.