Yes, a Power Steering pump can leak because of overfill or cold weather. As the seals are damaged due to pressure from overfill or due to freezing, the pump can leak.
There is no power steering in a Mercury Villager at start up in cold weather due to a failing pump or low fluid. Fluid becomes much thicker in cold weather and is much harder to pump.
During warm weather, Valvoline power steering fluid is recommended for the Buick rendezvous. In cold weather climates, Red line power steering fluid is recommended.
you can use any type of power steering fluid, personally i use transmittion fluid as it is cheaper then power steering fluid only down side is it takes longer to warm up in the cold weather
Sounds like your power steering pump may be ready to give up the ghost soon
to my knowledge there is no power steering filter i would check my power steering fluid level
could be where your power steering fluid is cold and thick
no
The power steering fluid is thicker when cold therefore it is harder to turn the wheel.
Could be that your low on power steering fluid. When it's cold, the fluid is more viscus, but once it warms up and thins out there isn't enough.
Because the weather is cold.
With the engine cold, remove the cap on the power steering pump. Inside the cap is a dipstick with a marking for both the cold and hot fluid levels
I am not a pro, but I think that the valves are sticking in the steering gear. I just had a similar problem and was told that you can have the steering system flushed but 99% of the time, that doesn't work. Change the steering gear out, that was what I ended up doing and it wasn't very hard.