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Old 10-30-2008, 11:00 AM   #1 (permalink)
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Question on 07 Prius noise when starting

Hi everyone --

I am new to this forum, but not new to my prius -- I have a 2007 toyota prius -- great car --

Just recently it started making a louder noise than usual when I press the power button -- I called one service place and they thought it was for the coolant in the engine which goes into a reservior when the car starts -- then I brought the car in for it's 30,000 mile service and mentioned it -- they changed the abs accumulator -- they mentioned there was a bullitein on this part -- it was like $2000 for the part (covered by warranty) -- but it is still now making the same noise --

any ideas?
thanks for your help

christine
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Old 10-30-2008, 06:10 PM   #2 (permalink)
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Christine:

Welcome to the site. I drove an 04 Prius (the first year of the current hatchbach style) for two years. I never noticed any strange changes in the noises produced by the car during its various phases of operation. That doesn't mean, of course, that something's not happening with your car.

Noises are notoriously hard to pin down. It will be a lot easier to tease out if: 1) you can be more specific about exactly what you're hearing, 2) you actually get an MIL (malfunction indicator lamp) on (the dramatic red exclamation point in a Prius), or 3) you get objective symptoms in addition to the noise.

As to number 2, when the MIL comes on, the ECU will store codes that the maintenance guys can download by plugging into your diagnostic port (located just behind the dash in front of your right knee). The codes are great truth-tellers -- if you actually get one... As to the last, if you get other symptoms, describe them carefully to the tech and maybe that will help solve the problem.

Good luck with this.
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Old 10-30-2008, 08:12 PM   #3 (permalink)
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The prius have there "prius" noises ive hurd them all. I work at a toyota dealership when I first started they freaked me out, but if its really loud I would get it checked out.
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Old 10-30-2008, 09:39 PM   #4 (permalink)
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thank you for your posts -- I have not as of yet gotten a malfunction light -- no codes stored,

it does make a nnnnnn noise when it starts up which has gotten like a zzzzz noise --
my husband thinks some bearing is failing somewhere --- like a coolant pump?

I was told that there was a coolant pump that circulates stored antifreeze into the engine prior to startup -- at another dealer -- is this true? maybe this could be the pump that might be failing?

anyone have any experience with this? --- seems to have gotten worse since the cold weather set in

again, though thanks for your help --

christine
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Old 10-30-2008, 10:57 PM   #5 (permalink)
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Quote:
Originally Posted by chrissty1 View Post
...
I was told that there was a coolant pump that circulates stored antifreeze into the engine prior to startup -- at another dealer -- is this true? maybe this could be the pump that might be failing?

a...
Yes, that's correct. The Prius stores about 3.0L worth of hot coolant on shutdown. When you push the power button, the system pumps the hot coolant back into the ICE's head and block to speed the increease to operating temps.
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Old 10-31-2008, 01:20 AM   #6 (permalink)
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See if you can locate the source when it makes the noise, if it is coming from the left front corner of the vehicle it is the coolant storage pump. A Toyota dealer would be able to help you with correcting that.

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