Overhead doors are extremely heavy, DO NOT leave it in the open position without springs unless it is very securely locked open. The door is heavy enough seriously injure an adult and could easily kill a child if caught under it when it fell closed.
Even if you made absolutely sure it could never fall on someone, opening the door without spring assistance is a big job, the bigger the door the heavier it is. Why risk hurting someone, a couple springs would seem cheap by comparison.
You could get some help and carefully open it to get the car out, then safely close it back down but I would not recommend continuing to use the door in this condition.
Extension springs - torsion springs -
Your garage door opener may work (with no springs) -
Not for long!!
The opener will burn out!
Residential garage door - 200 to 500 pounds -
think about that coming down!
It will (and has!) broken parts of human bodies!
(Oh, by the way - it's killed people)
If you operate it with one of the springs broken -
it can (probably, will) mess up one of the tracks.
A "DIY'er" can replace an "Extension" spring -
If it's a "Torsion" spring - a large, coiled spring above the opening of the garage door -
Call a "Pro"!!!
(I'm friends with people who deal with garage doors -
they told me enough "horror stories"!!)
Just my opinion.
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