How to open a garage door without a spring?

To open a garage door without a spring or with broken spring that normally counterbalances door weight, you need to use manual lifting with assistance, as door will be very heavy without spring support and requires caution. First, disconnect garage door opener from door by pulling emergency release cord, which is red cord hanging from trolley, down and toward door to disengage, allowing door to be operated manually without opener resistance. Since spring is broken or missing, door weight is not counterbalanced and can weigh 150 to 300 pounds depending on door size and material, so you will need at least two strong people to lift door safely, standing on both sides of door. Lift door slowly and evenly from bottom, keeping back straight and lifting with legs, as door may be heavy and can cause injury if dropped. Once door is lifted to desired height, prop it open securely with ladder, clamp on track, or locking pliers to prevent it from falling down rapidly, as without spring, door will not stay open on its own and can slam down causing injury or damage. Do not leave door unattended in open position without securing, as it can fall. To close door, lower slowly with help, controlling descent, as door will be heavy. Avoid using opener to open door without spring, as opener will strain and may fail. Call professional to replace spring costing 200 to 400 dollars for single and 300 to 600 dollars for pair, as operating without spring is temporary and dangerous.