I need someone with access to either a picture or an actual GMC Safari or Chevy Astro to tell me what this cap is that is circled in the picture. Seem it is now missing on my parents van and I have to figure out what it is.
I looked online but that is the biggest pic I can find. It is not for engine oil, trans, power steering or power brakes, or for the rad. If I only had a bigger pic so I could read the damn cap, lol.