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Discussion Starter #1
I thought the coolant change interval was listed in the owners manual packet,, but I sure can't find it now. Is that change interval shown somewhere? I have found that the coolant needed is Spec. 325.0 which is Mercedes part #BQ 1 03 0004, but darned if I can find the interval for my Smart. This coolant is a 15 year/150,000 mile coolant for many Mercedes models.

Len
2014 EV
 

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Since there's no internal combustion going on (less stress on the coolant), my guess, and that's all it is, is that 150K miles should be pretty safe. YMMV, of course. :)

PS - the 2015 owners manual says to refer to the maintenance booklet for coolant change interval info.
 

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It was my understanding that only the battery pack is liquid cooled and that the motor was air cooled.
At least that's the way the 453 ED has been designed...
 

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Discussion Starter #12
Thanks for the replies guys. Yes, this is for my EV, thus it's posted in the Smart electric sub forum. My thoughts are similar to yours, i.e. no internal combustion engine, so the coolant sees little in the way of extremes. If the Mercedes engines can go 150K/15 years on this coolant, then surely my EV can do the same. One more reason why I like it - so little in the way of maintenance needed. As I said, I see no mention of a change interval on anything EV I've looked at. I do see mention of coolant service on the ICE Smarts every four years though.

Maybe I'll plan on doing the coolant flush right after my next oil change. :)

Len
2014 EV
 

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It was my understanding that only the battery pack is liquid cooled and that the motor was air cooled.
At least that's the way the 453 ED has been designed...
Really? :eek:
Do you have a source? That would be a reason to avoid it! It was the other way round in some earlier EV designs (i.e. Leaf, and look where that led...) But the motor is the major heat producer in the system and air cooling would require a lot of space, which our little cars don't have, and make it very susceptible to weather conditions in hot climates...

The motor in the 451 is liquid cooled.
 

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MY08 cabrio MY09 cabrio Brabus MY15 ED
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451 ED motor is water cooled . . .

Zytek 451 EV motor and yes Gen 3 is by Bosch but of similar configuration.

Combined Motor/Inverter Unit:
Dry weight: 62 kg (137 lbs)
Power (max @ 278V): 55kW
Coolant: Water/Glycol mix
Operating ambient temperature: -20°C to +65°C, storage -40°C (-4°F to +149°F, storage -40°F)
Environmental rating: IP 6K6K

Motor:
Type: Permanent Magnet Brushless DC
Torque (max): 120Nm
Max operating speed: 12,000rpm

Inverter:
Type: IGBT 3-phase bridge
Supply voltage: 250V – 400V
Vehicle communications: Dual CAN
Vehicle auxiliary system supply: 14V at 70A (max constant current)

Dimensions:
Height: 351mm (13.82 Inch)
Length (face to end, excluding shaft): 433mm (17.05 Inch)
Length (front housing to end): 392mm (15.43 Inch)
Width: 366mm (14.41 Inch)
Motor Face Diameter: 241.5mm (9.51 Inch)
 

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Yes, they know what they're talking about. I've also seen a video blog done at the Miami 453 ED introduction
when a smart product management person described exactly the same configuration, air-cooled engine and
liquid cooled battery pack. Found it!!!

 

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Ok, I believe you now. Still don't like it, though!
Luckily, I'm planning to keep my 451 with liquid-cooled motor forever, even if I have to replace said liquid sometime. - See, I got back on topic!
 
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