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garygid
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Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: Water pump issue

Wed Oct 12, 2011 8:48 am

For the first weeks (or month) I did NOT hear the cooling pump running when I first turned the LEAF on in the morning.

Then, I changed to 12A L2 charging from 12A L1 charging, and days got a bit warmer. Strangely, I began hearing the pump run, for a while at least, when I first turned the car ON in the garage, without even moving.

Now, months later, I charge to 80% much more often, and I will have to listen for the pump(s). Yes, I believe that there are two, both with variable speed control.
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DaveL
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Delivery Date: 02 Jun 2011
Leaf Number: 2121
Location: Bellevue, WA

Re: Water pump issue

Wed Oct 12, 2011 9:16 am

garygid wrote:Yes, I believe that there are two, both with variable speed control.

A quick check of the service manual verifies that there are indeed 2 electric pumps. One is located under the reservoir (de-gas tank) and the other is located on the other side of the motor compartment. That's why you when you raise the hood you hear the pumps in stereo! :lol:

I noticed the pump sound all the time when I first got my Leaf, but I've long since gotten used to the sound. Now that we're getting into fall, I'll have to pay more attention to it to see if they don't run as much as during the "warmer" season. (That's what most of you call "summer", but most of us up here in the Seattle area don't figure we got one of those this year!) :)
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LEAFfan
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Leaf Number: 1855
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Re: Water pump issue

Wed Oct 12, 2011 11:38 am

TomT wrote:The pump only cools the charger.


They (the two pumps) also cool the motor and the inverter.
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Christopher
Posts: 118
Joined: Thu May 05, 2011 4:51 pm
Delivery Date: 04 May 2011
Leaf Number: 1407
Location: Santa Cruz, CA
Contact: Website

Re: Water pump issue

Mon Oct 24, 2011 3:05 pm

I was going to start a new thread but I see that others are already discussing this issue.

My experience is that, for the first few months, I would only hear the noise of the fans/pump while charging the car, after charging the car for a while, or after driving and using regenerative braking -- at least in warm weather. In other words, I would only hear it running when it was needed. On days when the car had not been used or charged recently, the car would remain silent when I powered it up.

After a couple of months however, it started to run all the time. No matter how cool the ambient temperature, no matter how long since it had been last charged or driven (even after a day or two), as soon as I power up the car, the noise of the cooling fan/pumps can be heard. It runs constantly now. Not only is it sad (I miss my silent car), I don't like the notion of expending energy to keep that pump running all the time.

Can someone confirm for me that the car can indeed be silent as I remember? In other words, you power it up and so long as you haven't been charging/driving recently (say, overnight) and the ambient temperature is cool, you don't hear anything? Of course the climate control system should be off too. (I ask because mine's been making noise like this since like July and I'm starting to doubt my memory.)

And if the answers come back yes, it can/was/is silent, how many never get silence now? Who else starts up their car and *always* hears the same sound you hear when you plug-in for charging -- the apparent sound of the cooling fans/pumps for the invertor (and motor?)?

Thanks!

JustinC
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Joined: Mon Aug 30, 2010 2:18 pm
Delivery Date: 06 Sep 2011
Location: Lost Angeles

Re: Water pump issue

Mon Oct 24, 2011 3:53 pm

I feel like I have always heard the pump when I start the car and also when charging. I only got mine in early October, however, so maybe it w has been too warm to run without it. I was actually a little disappointed since I had been given the impression that the car was relatively silent. No big deal, but it's no quieter than the hybrids int neighborhood.
2011 Black LEAF
Jan 1, 2013 Status = [15 months] [6K miles] [12 Bars]

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aqn
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Joined: Fri Oct 01, 2010 12:59 pm
Delivery Date: 30 Apr 2011
Leaf Number: 1333
Location: Austin, TX

Re: Water pump issue

Mon Oct 24, 2011 6:07 pm

Debugging noises is often futile and frequently fruitless over the Internet, and sometimes it's so even with mechanics whose hearing may be suspect, or who has had little experience with/exposure to a particular model/area of problem.

Isn't the Bay Area crawling (probably literally! :) with LEAF's? Have you asked another LEAF owner to meet up and do a side-by-side comparison?
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aqn
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Re: Water pump issue

Mon Oct 24, 2011 7:26 pm

BTW, is the noise much different, or does it go away entirely, after the water pump replacement? Also, did you get any indication as to which water pump it was (other than "waterpump 2", that is)? Just gathering info... Thanks.
Anna Nguyen

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johnr
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Joined: Sun May 02, 2010 2:08 pm
Delivery Date: 11 May 2011
Leaf Number: 2151
Location: Exeter, CA

Re: Water pump issue

Mon Oct 24, 2011 7:43 pm

Probably the bearings in the pump were going bad. I'm also curious whether the OP got it replaced and how the process went.
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EVDRIVER
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Re: Water pump issue

Mon Oct 24, 2011 10:09 pm

johnr wrote:Probably the bearings in the pump were going bad. I'm also curious whether the OP got it replaced and how the process went.



Not likely, there is crap in the lines form the factory that can jamb the tight pump tolerances. Mine had junk in the pump. Got a new one.
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EVDRIVER
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Re: Water pump issue

Mon Oct 24, 2011 10:14 pm

TomT wrote:The battery pack in the Leaf is not liquid cooled like the Volt so it would have no affect on it. The pump only cools the charger.

chithi wrote:I was more concerned whether there could be any long term damage to the battery-pack from this pump going bad.



I was concerned it would not cool the radio and the cigarette lighter :lol: Since the LEAF has a sealed pack that is not cooled, it is almost a given the inverter and charger would be on the same loop as in most modern EVs.
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