A few months ago my fan started making a lot of noise and is getting really hot. I've taken steps to prevent overheating, but nothing has changed. Is it a battery issue?

I've had the computer for 2 1/2 years and it started getting really noisy about 4 months ago. I'm using rulers to elevate the computer above the surface of the table to prevent overheating, but its still getting really hot and the fan is still making a lot of noise on and off. Could this be a battery issue?

Intel-based Macs: Resetting the System Management Controller (SMC)

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