DarkStar
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Delivery Date: 25 Mar 2011
Leaf Number: 568
Location: Hillsboro, Oregon, USA
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 10:24 am

garygid wrote:So, has ANYBODY had extended bubbling sounds and coolant flow into the overflow bottle (front, left of center), especially during extended-duration charging?

I've never done extended Level 1 charging (5 hours at the most right now), but I've heard the pumps whirling the coolant around (which I guess could sound like "gurgling") and it does get warm, but I wouldn't call it hot. As the coolant gets warmer and cooler it should be normal for fluid to flow to/from the expansion bottle, but as warm as I've noticed it I wouldn't think it would change very much.
Mikiko (2011 Nissan LEAF ETEC) Status:
Reserved: 04/20/10 | Ordered: 10/01/10 | EV Project Blink Installed: 03/22/11 | Delivered: 03/25/11 | VIN: 568

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JasonT
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 10:31 am

garygid wrote:So, has ANYBODY had extended bubbling sounds and coolant flow into the overflow bottle (front, left of center), especially during extended-duration charging?
On what I believe was my first charging sessions I was surprised at all the noise the car made. I popped the hood, and noticed that there was bubbling going on with the coolant unit in the back left (just left of the DC inverter). I have not paid much attention since, so I don't know if this is happening every time or not.

DaveinOlyWA
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Leaf Number: 314199
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 1:41 pm

Drove 79 miles yesterday. Plugged in at 7:30 pm last night. Checked it at 10:20 and 5:25 am this morning. Not a sound but very very faint fan sound.

Sounds like that is the missing element.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
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garygid
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 1:59 pm

Got a flatbed to Connell Nissan where there are kind, helpful folks with considerable LEAF expertise available.

Conjecture is that the cooling system was not "purged" properly at delivery, and that it has air in some of the "voids" back near the charger. These air pockets might overheat, cause steam, etc.

They are going to check for error codes, purge the cooling system properly, and run some tests.

My questions:

1. Were the fans operating properly?
(Presumably they should have been ON full speed at the very-hot temperature.)

2. Why did the charger keep charging at the elevated temperature?
(Did it record any "too-hot" codes?)
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
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smkettner
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 2:06 pm

Was the pump running is my only question. And of course the pump cannot pump air if in the system.
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DaveEV
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 3:21 pm

garygid wrote:1. Were the fans operating properly?
(Presumably they should have been ON full speed at the very-hot temperature.)

2. Why did the charger keep charging at the elevated temperature?
(Did it record any "too-hot" codes?)

If it was localized boiling caused by bubbles in the cooling system, the car probably would not have detected any overheat condition thus never turning on the fans or stopping charging.

The Connell Nissan techs seem to be spot on.

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LakeLeaf
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 3:53 pm

garygid wrote:My questions:

1. Were the fans operating properly?
(Presumably they should have been ON full speed at the very-hot temperature.)

2. Why did the charger keep charging at the elevated temperature?
(Did it record any "too-hot" codes?)


Good questions Gary. It sounds like maybe not all error or failure routes are known or fully understood. The real answers to these questions, if fully investigated by Nissan, might end up in firmware rev E - which would henceforth be known as the garygid firmware.

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TRONZ
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Leaf Number: 202
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 4:00 pm

Have only had the fans come on time to time. No coolant sounds of any kind for us.
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2011 LEAF SL VIN#202, Delivered 01.30.11. Now, by far, the oldest LEAF in Colorado.

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garygid
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Re: Radiator Bubbling like Teakettle

Fri Apr 29, 2011 7:37 pm

Got the car back.
They properly got the air out of the HV coolant system (inverter, charger, and motor).
No codes found.
They charged (L2) for about an hour (or so) and things seemed normal: "unable to reproduce the problem".

So, hopefully that was it, just that the coolant system was not properly serviced before delivery and there were air pockets in the charger.

But, that still does not quite match all the symptoms.

So, we will watch and report anything further.
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
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starry
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Re: Radiator Bubbling like Teakettle

Sat Apr 30, 2011 9:56 pm

Drove car home Friday eve after techs said "could not reproduce problem" with boiling fluids in tanks. Charged Level 1 for three hours, some boiling in both small white tanks under hood, and level of overflow tank in front went up to MAX. Turned off charger and went to bed, checked at 0630 Sat. Car all cool, coolant overflow tank down to MIN. Plugged in Level 1 charger for five hours or so. Came out, every tank and tube for fluid under hood was very hot, bubbling, and overflow tank was full up to the cap. Turned off charger, let car cool again.
At no time during these charging and boiling sessions was the A/C heater system ever on, or ever programmed to turn on at any time, either from car control panel or CARWINGS. At no time have I ever heard or seen or felt either fan in front of the motor be on. I do hear pump motor noise as a faint hum.
Called Service scheduler at dealer and he advised to have car trucked in again Monday, but his LEAF tech expert(s) (s?) would be absent until Wednsday.
I will drive car Sunday a bit, and drive to dealer (30 miles) on Monday. Purpose is to discharge battery down to point where it can be charged in dealer's presence at Level 1 for at least five hours. This is because that routine would duplicate what I do. None of this Level 2 charging for an hour or so and pronouncing "unable to reproduce" will satisfy my request for an adequate investigation of the problem, if any.
Possible next level of effort would be making a video recording of my situation.

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