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Guest Message by DevFuse

Get you C-MAX Energi Registered in the official Ford Authorized Registry. More here.

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HVB cooling fan failure

hvb cooling fan

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21 replies to this topic

#21 ONLINE   rbort


    Energi Member

  • C-MAX Energi Member
  • PipPip
  • 4,288 posts
  • Region:U.S. Northeast
  • LocationFranklin, MA
  • My C-MAX:2017
  • Current Vehicle:Cmax Energi Titanium with Moonroof

Posted 07 July 2018 - 07:36 PM

Sure it was hot, they don't cool down that quick, ask Tom about it he can tell you how it is in the head.


However, if you're not keeping the car past the end of the year, then it doesn't matter.  All this talk here only matters for the long term people, not the leases and short term folks.



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#22 ONLINE   cr08


    New Member

  • C-MAX Energi Member
  • Pip
  • 249 posts
  • Region:U.S. Great Lakes
  • LocationColumbus, Ohio
  • My C-MAX:2013
  • Current Vehicle:2013 Ice Storm C-Max Energi

Posted 07 July 2018 - 09:28 PM

I've been driving around with the cover off in the back exposing the HVB exhaust vent.  When I'm charging if I'm in the car or if its in my garage I open the tailgate to let the heat out.  I can actually charge and lower the car's HVB temp while charging.  I found that using the slowest possible charger helps if trying to do this.  As the battery gets less amps put into it and takes longer charging hence allows the cooling fan to run longer.


I have 3 chargers available to me.


1) 120v 10 amp, charges at 1180w and puts in around 2.8 to 3.1 amps into the battery.

2) 120v 12 amp, charges at 1380w and puts in around 3.5 to 3.8 amps into the battery.

3) 240v on the road, charges at 8.2 to 9.9 amps or there abouts depending on the station.


On the road I use the fast 240v charger.  At home I use the faster 120v charger if I need to charge quicker to go out, and the slower one if I need to take my time or cool the battery for a longer period of time before unplugging it.  (like getting home on empty with a hot battery, plug it in with the slow charger and charge it to 20% and then unplug it to rest).


I'm still under the impression that the battery cools better with the cover off.  Just from feel and experience both ways.


I read you guys want to put other fans to shove some air down the intakes, but do you realize that the HVB cooling fan can run at several speeds? I Slow is 1000 rpms, but as you drive faster and faster I've seen it go up as fast as 2125 rpms IIRC.  What about just running a 12v wire to the fan directly and being able to switch it on yourself any time you need it, rather than wait for it to wait until the temp differential is 7 degrees plus before it kicks in?  Also if you had the "full voltage" I suppose you can run it at max speed all the time.


What are the thoughts about that?



I'm not after shoving more air IN but after trying to get the hot air OUT of the car and not back in to the cabin. Hence my request since you guys have already started digging into the car a bit, if you've had any potential theories on how to route the air where it seems to be exiting the battery from and getting it to those louvres to outside of the car. You've agreed yourself at least once this is likely to be the biggest benefit versus just letting it recycle its own heated air inside a sealed cabin. Shoving more air in without redirecting the exhaust air outside of the car is going to do absolutely jack and shit.

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