You should never use a car seat past it's expiration date Crash test data is constantly being updated and newer car seats are made safer with this data. Plus, car seats are made of plastics. Consider what happens to a plastic toy if it is left outside for some time. The plastic becomes brittle and can develop cracks when stressed. Car seats are subjected to extreme heat and extreme cold while sitting in your vehicle, so the plastics eventually react just like that toy left in the sun. I wouldn't recommend getting the car seat tested. I would strongly recommend destroying the expired car seat and purchasing a new model.
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You should never use a car seat past it's expiration date Crash test data is constantly being updated and newer car seats are made safer with this data. Plus, car seats are made of plastics. Consider what happens to a plastic toy if it is left outside for some time. The plastic becomes brittle and can develop cracks when stressed. Car seats are subjected to extreme heat and extreme cold while sitting in your vehicle, so the plastics eventually react just like that toy left in the sun. I wouldn't recommend getting the car seat tested. I would strongly recommend destroying the expired car seat and purchasing a new model.