What amp relay do I use for a turn signal relay?

I'm trying to fix the signal lights on an 01 Cavalier. I don't have the car right now and am looking into what I may need. Its not the bulbs or a fuse. It is either the switch or the relay. It stays on rather than blinks (with no sound of it functioning) when the car is heated up. When it is cold the blinker works. I have a 30amp/12v relay available. Can I use that to see if that is the problem?

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