Question about 2003 Toyota Prius

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Coolant Pump Noise after engine off

After turning engine off in cooler weather there is a reservoir pump noise. How easy is it to replace it myself?
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  • Anonymous Jan 26, 2009

    I have the same problem and have had the pump replaced once already, however the noise persists. Toyota claims that this will not effect the opeation of the car and will not leave me stranded. I have friends with Priuses and their cars do not make this noise. This is my second Prius and both cars have done the same thing. Does Toyota really know the cause of this noise???

  • Toyota Ed May 11, 2010

    You do not need to replace it, and it is difficult to replace, as you will not be able to bleed the air out without a scan tool; you run the risk of overheating and damaging the inverter. The noise that you are hearing is the "heated coolant storage system" operating. This is a normal condition, and is to be expected in cooler weather. Under the driver side front fender is a big "thermos bottle", that holds hot coolant, your car is normal, unless you have malfucntion lights on. Please feel free to post back if you have any other concerns.

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Here's the Toyota TSB that describes the problem and directs the dealership what to do about it:

http://files.meetup.com/211111/TSB-0087-08_CoolantPumpSqueal.pdf

Posted on Jan 25, 2009

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1 Answer

Power steering making noise


The power steering will make a noise if insufficient oil is in the system. After replacing the pump, it is no good just topping up the reservoir, the system needs to be purged. It is best to do this with the front wheels off the ground. Fill the reservoir and then, with the engine running, turn the wheel from lock to lock ( fully one way then fully the other way). Do this a number of times and keep topping up the reservoir to the correct level. With the bonnet, (Hood), up you should be able to hear where the noise is coming from. If the system has been properly serviced it should be quiet. If not you might have to get another pump.

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How to bleed the power steering pump?


Probably too late now, but with new pump, jack up front end and put on stands. Fill reservoir to normal full, start engine and slowly turn wheel right and then left to almost lock. Refill as needed and repeat until all bubble disappear from reservoir. Still got noise? Replace pump.

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Terrible whining in the steering? What could this possibly be?


Thank you for the inquiry.
For some reason power steering fluid does get contaminated and needs to be replaced. Worst case the fluid is low and you are hearing gear whine. It's a known issue with this pump to whine when the PSF is contaminated. Needs to be checked and serviced.
Here is a procedure for you Do It Your-self-ers:
You can easily change the fluid yourself, and save a ton of money.

If you follow the lines that go from the steering rack to the cooler located around the radiator area, there's a hose that comes out of the cooler, and connects with a hard line right above the left front frame rail. The connection is a simple spring clamp.

Easy but fairly messy to change. Engine OFF, lift the front of the car to get the front wheels off the ground, put a pan under the hose line, and pulled it loose from the hard line. The bad fluid will drained out, then slowly turn the wheels from side to side a bunch of times to pump out all of the fluid from the rack. When all of the fluid is out, reconnected the line, then fill the fluid reservoir with a high quality Power Transmission Fluid. You can again, turn the wheels side-to-side to get the new fluid into the rack. Then, start the car, again turning the wheels side to side. Top off the reservoir, and should not have any more noise from the power steering pump. It will take a little less than a full quart to completely refill the system.
Kind regards,
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Having trouble with power steering pump. I think it has to do with the fluid/leak fixer I put in. I have been given some small amount of hope that if I drain the system and put the correct fluid in it I...


Hello, since you have a Limited it probably has an oil cooler at the bottom front of the vehicle. They are usually hung ahead of the radiator.

The oil cooler is a good access point because it is the lowest point of the system. One of your lines will come from your Reservoir and the other will go to the pump. Check the Reservoir line for leaks as the plastic clips hold moisture and corrode the metal portion of the line. These small air leaks will reduce the efficiency of your pump.

Unless Ford makes a product to clean the pump, I would use the correct fluid and let the pump cycle the fluid out 1 quart at a time. Drain the Reservoir first, let the pump side drain out the cooler line, reconnect, add 1 quart, run vehicle, drain Reservoir, drain pump line, repeat. Probably waste 3 quarts of fresh fluid doing this, 1 quart at a time.

Now I understand if noise is the problem, Lube-guard makes about 8 products and the one for Power steering will reduce noise almost immediately. I have heard it work on a 2004 F150. There are also Quick lube places with pumps for Transmission fluid changes. If you want to try their system, I believe they can use adapters and hook you up.

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After I replaced the power steering pump and reservoir on my 2002 Jeep, I still get air in the system. Where could it be coming from?


Your problem could be a pressure side hose that has a rupture that only leaks in extreme conditions. Inspect to replace with new to repair problem. First make sure you have removed the pump caps off of the hose fittings. If ok, it appears you may have a stuck valve in the rack assembly. Replacing the rack should solve your problem. ------- The new pump should be self-bleeding by turning the wheels left and right. Let sit over night to release air bubbles, recheck fluid level.------ Check the tension of the drive belts on the pump, as they may be loose. The power steering pump and reservoir is located on the front of the engine driven by one of the fan belts. There is a removable cap on the top with a dipstick attached. With the engine off, fill this up to the full mark with power steering fluid. Replace the cap, start the engine and check for leaks. On the back of the pump are two hoses either one could be leaking. REPAIR PROCEDURE:
1. Wipe the power steering cap and area free of dirt. Remove the power steering cap.

2. Use a siphon pump to remove as much fluid as possible from the power steering fluid reservoir.

3. With a helper in the vehicle, raise the vehicle on an appropriate hoist.

WARNING :POWER STEERING FLUID, ENGINE PARTS, AND THE EXHAUST SYSTEM MAY BE EXTREMELY HOT IF THE ENGINE HAS BEEN RUNNING. DO NOT START ENGINE WITH ANY LOOSE OR DISCONNECTED HOSES. DO NOT ALLOW HOSES OR POWER STEERING FLUID TO TOUCH HOT EXHAUST MANI FOLD OR CATALYST.
4. Locate the power steering cooler attached to the crossmember support plate. Slide back the clamp and disconnect one of the two power steering return hoses at the power steering oil cooler and drain fluid in an appropriate container.
5. Have the helper turn the steering wheel back and forth quickly several times to force as much fluid as possible from the steering gear.
6. Reconnect the hose at the oil cooler using the original clamp.
7. Lower vehicle so the vehicle tires are not contacting the ground.
9. For proper fluid fill and bleeding air from the power steering system:

a. Fill the power steering reservoir to the top of the fill range using Mopar power steering fluid (ATF+4) p/n 05013458AA.

b. With the engine OFF and the vehicles tires off the ground, slowly turn the steering wheel back and forth (lock to lock) slowly 20 times to force fluid into the steering gear.

c. Fill the power steering reservoir to the top of the fill range.

d. Start engine and let run for a few seconds, then turn oft engine.

e. Check fluid level and add if necessary.

f. Start engine, and slowly turn the steering wheel lightly contacting the left and right stops.

g. Stop the engine and check fluid level. Add fluid if necessary.

h. Lower vehicle, start engine and slowly turn steering wheel lock-to-lock.

I. Stop engine and check fluid level. Add fluid if necessary.

j. If fluid is extremely foamy, allow vehicle to stabilize a few minutes, then repeat steps "i" and "j" until the fluid level remains constant after running the engine and turning the steering wheel from lock to lock.

10. Inform the vehicle owner/operator that a steering vibration may be noted for a few hundred miles until the air is completely removed from the steering system.
This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya

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I haven't heard the noise, but it's usually the belt. Check its tension, check it for frays or wear.

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Best regards

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