power steering problems

[ryans69chevy]

Every morning when I start my pickup I don't have power steering. I can't figure out what could be causing this. If I start my pickup and then turn it off and start it again I will have power steering. It's a weird thing... Maybe it's the cold weather? I replaced the power steering pump this summer since the last one was so winy. I park my truck outside at night. Could it just be the cold? It just doesn't make sense that when I turn it off and turn it right back on it works.

Any advice would be helpful!

Thank you