Intertherm MRAC E2517, AC and cooling works fine so blower obviously works. When we try to heat it just blows cold air. I went to look at the element and it looks like there are two of them, one above the other.

I cannot find any info on this specific model and parts sites have single elements but this furnace looks like it has two stacked above each other.
The upper has 4 posts and a thermostat (2rd/2blk) above another element with 2 posts (1rd/1blk) and a thermostat.

If one is bad will neither work or are both bad?

All fuses are good.

Do you have a multimeter and do you know how to use it?