How do I know when the thermostat is broken on my upright freezer?

After thawing out the compressor,I plugged it back in 4 days later.9 hours later the temperature was 40 degrees.I tapped on the Temperature Control Knob & the Freezer started to run.Now nearly an hour later the temperature is 10 degrees and it's still running.What part do I need to replace to get my freezer... show more After thawing out the compressor,I plugged it back in 4 days later.9 hours later the temperature was 40 degrees.I tapped on the Temperature Control Knob & the Freezer started to run.Now nearly an hour later the temperature is 10 degrees and it's still running.What part do I need to replace to get my freezer back to where I can depend on it.It is a Frigidaire Model # MFU17F3GW6
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