Do I need any special coolant when I install this?

Use the same coolant type your TL originally came with—check your owner's manual for the specific formulation. Flush the system before filling to avoid contamination.

Will this bolt directly into my car, or do I need adapter brackets?

This mounts at the factory attachment points with no adapters or modifications. Bolt pattern and hose connections match OEM spec exactly.

What's the return window if it doesn't fit or fit properly?

Standard modsupply.com return policy applies—check your order confirmation or contact support for exact timeframe and condition requirements.