The issue with the 1.25-inch Irvine shade spring not staying down when installed, despite working properly outside the window, often relates to the shade mechanism or installation alignment rather than the spring itself. First, ensure the shade is correctly seated and that no components in the window frame or shade track are obstructing or interfering with the spring’s locking action. Inspect the shade mechanism for any wear, damage, or misalignment that could prevent the spring from engaging fully. Since the spring functions well off the window, the problem likely lies in how the shade and spring interact during installation.

Irvine has indicated that these springs generally function reliably until failure, so replacing the spring is a common fix. In this case, a replacement spring was shipped to ensure the component is not defective. If the replacement spring also fails to lock the shade down, carefully examine the shade’s mounting hardware and window frame. Adjustments or repairs to the window shade assembly itself might be necessary.

For best results, remove the shade from the window and verify the spring’s operation independently, then reinstall with attention to proper alignment and mounting. If issues persist, consulting a professional RV technician or contacting the shade manufacturer for detailed guidance on your specific motorhome model can help resolve the problem.