1990 Silverado 3500 - have had a squeak or tweet for over a year that I can not find. Replaced the belt, idler pulley, and the belt tension pulley but didn't solve the problem. -4F here in Ft. Ashby WV this morning, let the truck warm up for ten minutes before heading to work. Steering was so stiff this morning that I had to drive with both hands. After a thirty minute drive the steering was only slightly better. My question is will the low temperatures make the power steering fluid thick enough to account for the hard steering or is it more likely the power steering pump going bad. Hope everyone is staying warm.