Power steering pump replacement - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 06-13-2007, 08:57 PM
stradi_various stradi_various is offline
New Member
Join Date: Jun 2007
Posts: 1
Power steering pump replacement

When the going gets tough, the tough gets going...
I drive a 2003 TB EXT, which did not give me too much trouble until recently when the fan clutch decided to fail at the same time as the power steering pump (and I suspect the water pump too).
So, I took the matter in my own hands after getting some crazy quotes for the replacement of the above noted parts.

I shall describe the PSP replacement procedure, without removing the fan shroud or any other parts; unfortunatelly I did the work by myself and could not take pictures but I hope you will get the idea.

Step 1: Buy a new PSP (don't need the reservoir).
Step 2: Rent a PSP pulley removal\installation kit (kit #20 at Canadian Tire); there is no cost associated with this, as CT will refund your money upon return.
Step 3: Buy 2 liters of power steering fluid.
Step 4: Let the engine cool before doing any of the work described further.
Step 5: Remove the accesory belt (push down on the belt tensioner).
Step 6: Remove the air filter cover and filter to have some more room to work
Step 7: Remove electrical connector from the pump
Step 8: Using CT kit #20, remove the pulley; arm yourself with patience, as this will take a while due to the limited space (since you did not remove the front of the vehicle)
Step 9: Empty the reservoir (use a vacuum pump or a hose to suck the fluid from the reservoir to minimize spillage)
Step 10: Disconnect the hose clamp from the underside of the reservoir and pull down on the hose (wrap the hose in a cloth to reduce spillage)
Step 11: Unscrew the pressure hose from the underside of the pump body; again, wrap it with a cloth beforehand
Step 12: Unscrew the three bolts fastening the pump to the holding bracket; the pump can now be removed from the engine compartment
Step 13: Remove the two clamps which attach the reservoir to the pump; do not pry on the clamps. Use a flat head screwdriver to pull up on the lock and slide the clamps sideways, one at a time. Once the clamps are removed, the reservoir can be detached from the pump body
Step 14: Install the new gaskets which came with the new pump. Mounting of the pump in place is the reverse of the removal procedure

Once installation is complete, fill the reservoir with new fluid and start the engine. Check fluid level several times during the following procedure. With the engine running, turn the wheel both ways to work the pump and ge tthe fluid flowing. This will remove air from the system. Every week after the procedure (for the next couple of weeks), remove the fluid from the reservoir and replace with new fluid (remember that the fluid left in the hoses was not flushed).

In my case, the thing worked like new and I hope it will for you too.

Have fun, and don't blame it on me :-)
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Old 12-28-2009, 02:12 AM
rickyrats rickyrats is offline
New Member
2005 Chevy TrailBlazer LS EXT
Steel Gray Metallic 4.2L I6 4X4
Join Date: Dec 2009
Location: Alamosa, CO
Posts: 0
need help

Hello, I followed your instructions on the replacement of the new power steering pump on my vehicle, great instructions. The only thing I have not really had time to do is to keep taking the fluid out and replace with new fluid yet. I have bled the lines once.

The reason for my post today is to ask you if you have any idea why I still have a really bad squealing noise still coming from the pump just like the old one? At first it was working ok but within the same day of changing it out it started to squeal again. Checked the fluid and it is at the proper cold level. It is a remanufactured part, could it be defective?? Any suggestions?? I really am not sure what to do.......it still is under warranty but I really hate to replace it again if you have a more easy remedy?

Thank You in advance!!!
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Old 12-28-2009, 02:19 AM
silver ghost's Avatar
silver ghost silver ghost is offline
2003 Chevy TrailBlazer LS
Light Pewter Metallic 4.2L I6 2WD
Join Date: Apr 2007
Location: oklahoma city
Posts: 177

Hello! The pump is still under warranty and i would not take a chance and try to find the cause, because its a reman.Defective i would say!!!
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Old 12-28-2009, 06:29 PM
WOOLUF1952 WOOLUF1952 is offline
No longer with us
2003 GMC Envoy SLT
Magnetic Red Metallic 4.2L I6 4X4
Join Date: Jul 2008
Location: Milwaukee, WI
Posts: 7,190
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Old 07-12-2013, 01:06 PM
zach419 zach419 is offline
Junior Member
2004 Chevy TrailBlazer LS EXT
Black Granite Metallic 4.2L I6 2WD
Join Date: May 2012
Location: toledo ogio
Posts: 1
new chirp after psp replacement

I just recently replaced my PSP. Now when I start up from when the engines cold I get a intermediate chirp. It goes away when the engines warms up. So I was wondering is it possible to put the pulley on to tight? If so what should the gap be?

I have a 04 trailblazer ext 4.2
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Old 04-02-2017, 05:05 PM
scarpenter scarpenter is offline
Junior Member
2004 Chevy TrailBlazer LS EXT
Silverstone Metallic 4.2L I6 AWD
Join Date: Sep 2011
Location: Guernsey, WY
Posts: 2
Thanks stradi_various, you saved me a lot of work

I removed the air filter as you suggested. I also unplugged the electrical connections to the windshield washer tank and took off the two nuts attaching it to the body. I then put the washer tank on the engine. I did not have to detach the washer lines. I then had plenty of room to get the power steering pump out with the pulley on it. The Haynes manual wanted me to remove a lot of the shroud and fan as you said. Your process was much easier! My Trailblazer is a '04 ext w/4.2.
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