What's this in front of the radiator?

karyins

New member
karyins-albums-what-s++wire%3F-picture42182-img-20160924-142830.jpg


The other day it had a bubble in the little round window so I thought oh it's a bubble level! Today it seems dry or it's filled with liquid.

What is it anyway? Kinda curious here...

Thanks!
 
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Ac freon. Look through it when ac is on(Compressor running). Foaming bubbles indicate low freon. Clear is full.
 

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