I drove her car this morning. Down to 20F last night, about freezing when I started it ~9:30am. Belt chirped, some pulsing in wheel and weak assist. I got out to check fluid level and it was good. She said it has been like that when cold, like under 45F. I didn't know that. I probably haven't driven it in a month or six weeks and not since the weather turned. I put 1k miles on it in a week in September on vacation and it was flawless. (The drive from here to the Continental Divide in Montana and back is really quite pretty. ). Oh yeah, Lexus ES300 2003. once the car is driven a short distance, everything's fine. I replaced the pump 4.5 years ago/75k miles ago with one from O'Reillys. Normally I'd rebuild it myself but at that time, it failed suddenly and we needed the car fixed asap, so I bit the bullet and got one at the nearby O'Reillys. Since then, I've swapped the reservoir fluid every 30k with top quality ATF, and added some Lubegard for seal treatment. It has not been losing fluid. I'm wondering what's going on in the cold, and with a non-leaking, not that old factory rebuilt pump. Could it be something in the rack?