Door will not stay closed/door keeps opening. First, you will have to use force to lift the door a bit. Houston, TX garage Door Specialists Garage door opener Both extension springs need to be in working condition to operate the garage door. How to open garage door with broken spring and cable . While the sizes can vary, most will be seven feet tall. Once the door is securely open, you should be able to easily unhook the springs, replace the cable, and hook up the springs again. How to fix garage door cable. Unlock the emergency release cord: Protect your back, be careful not to pinch your fingers, and don’t let the door fall on your feet. Torsion springs lift the weight of a garage door and allow the opener to fully open it. A garage door should not be opened until the spring is repaired. Unlike the tension springs, the torsion spring is replaced when the door is closed. A garage door repair technician would replace both cables as a precaution anyway, so this won...