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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Power steering making noise


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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.
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You can easily change the fluid yourself, and save a ton of money.

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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...


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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.

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No filter. If the pump it going out, the reservoir and pump are a single unit and need to be replaced as such.

Best regards

Mike

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