new to forum Power steering question
I recently purchased a 1985 gmc vandura/ward short bus. While sitting in park or at very slow speeds, engine running, when I try and turn the steering wheel its pretty difficult and seems to kind of bind up and squeal. While I am in motion at a little faster rate there doesnt seem to be any binding or squealing at all. What could be the cause of this? Is the power steering pump getting weak, or is the best possibly slipping? Any tips would be appreciated thanks!