My 2004 Chevy Tahoe howled under the hood when I started the car. My car was squeaking so much that if you saw my sweet Tahoe driving down the street you'd think there was a box nearby! I Turns out the steering fluid reservoir was dry to the bone! I put half a bottle in and the tank was full, with half a bottle for later should unforeseen circumstances arise. As far as I know this solved my problem, I have yet to figure out why all the liquid was leaking in the first place. Be sure to keep this in mind when using as this power steering fluid does not contain "stop leaks" so it won't solve your leaking problem but it should stop your howling problem.