I had some issues with my power steering going in and out, so i decided to change the pump. Replacing the pump was straightforward and easy, but thats not the problem. The problem is finding the correct pump for a 2007 HR motor. I went on rock auto and ordered myself a rebuilt pump. The pump came with a pulley, but the pulley was wrong. It was a 5 groove Pulley and my car uses a 6 groove.

I decided to take the pulley off my stock pump and put it on the new pump. I found that when I press the pulley onto the new pump, its very easy to destroy the pump, which I did - clearly, these pumps are not designed to take any axial loading.

So, I'm wondering if I even got the right replacement pump since the pulley was wrong. Also, when i went to various parts stores and searched for a pump for a 2008 (yes, my car is a 2007, but both are HR motors) they didnt have a pump for that year. It make me wonder if there was some mid-year change in 2007, and my pump is actually from a later part of the year while the one i got is for the older motors..?

So is there a difference in pumps for various years? Or is it just the pulley?

If i do have to swap around a pulley, what is the correct way to get these pulleys off since the center is not threaded. Also, how do you get these pulleys on safely?

I just found AC Delco part numbers from Rock Auto for various years:
36P0864 {#19319390} 2009
36P0864 {#19319390} 2008
36P0871 {#19319397} 2007
36P0871 {#19319397} 2006

I think, I might need the 2008 pump because the other pump is the same for the older engines..?

 

get the 08 pump. Shouldn't have to take off anything other than the old pump itself

 

I found that 08 pumps are not available anywhere!

 

As far as i can tell, the older and newer pumps differ by only the pulley on them. I was able to swap the pulley to a new pump. But after i got everything back together, the car is just like before - no power steering. I think something else is wrong, its like the pump isnt getting any fluid or anything. I have no idea what it could be.