Whining Sound Coming from fan

DrJay

Member
Joined
Dec 21, 2016
Threads
5
Messages
31
Reaction score
14
Location
Fair Lawn NJ
Car(s)
2016 Civic LX-P Coupe
This issue may have been covered on a previous thread but I'm giving it a shot. I have had my Civic Coupe for almost three months. Whenever the heater/ defroster is on, (haven't had the AC on yet) I get a whine that seems to be coming from the fan... but only when I am braking and coming to a stop. I don't hear it on acceleration, as I would have expected if it was the fan revving up.
Anyone else have this sound?
Is it normal or possibly an indication that the fan is not functioning properly.
Thanks for any input.

 

Draken187

Senior Member
Joined
Sep 28, 2016
Threads
44
Messages
1,273
Reaction score
664
Location
Connecticut
Car(s)
2013 accord ex-l sedan, 2016 accord sport sedan, 2006 civic type r (in spain) and 2017 civic sedan ex-t w/manual transmission
Country flag
This issue may have been covered on a previous thread but I'm giving it a shot. I have had my Civic Coupe for almost three months. Whenever the heater/ defroster is on, (haven't had the AC on yet) I get a whine that seems to be coming from the fan... but only when I am braking and coming to a stop. I don't hear it on acceleration, as I would have expected if it was the fan revving up.
Anyone else have this sound?
Is it normal or possibly an indication that the fan is not functioning properly.
Thanks for any input.
No weird noises from mine.. However i do recall threads on the subject.. Try using the search and see if you come across something
 

inv4zn

Senior Member
Joined
Mar 2, 2016
Threads
9
Messages
1,996
Reaction score
1,589
Location
Vancouver, Canada
Car(s)
'16 Touring
Country flag
Are you sure it's not that the fan sound is masked by engine noise during acceleration, and you only hear it when slowing down because there's no load on the engine?

There's a bit of compressor whine in my car at times but as long as cold is cold and hot is hot, I'm not too worried about it.
 

lebshiff21

Member
Joined
Jan 16, 2017
Threads
1
Messages
20
Reaction score
15
Location
PA
Car(s)
2017 Civic EX Hatch
I hear it w/ the climate control on and it goes away when I have it off. Pretty sure it's a fan.
 

Farah487

Senior Member
Joined
Nov 12, 2016
Threads
8
Messages
62
Reaction score
79
Location
Canada
Car(s)
2018 Honda Accord
Vehicle Showcase
2
I have a similar sound with mines but is present when I turn on the heat.
 

yyzcbphatch

Member
Joined
Dec 11, 2016
Threads
1
Messages
29
Reaction score
8
Location
Toronto
Car(s)
Mini CS
Vehicle Showcase
1
Yes, same here i get that weird compressor/whining sound when coming to a stop.

Is it normal? But when the fan is off, i don't hear it.

Mine is a Hatch.
 

Draken187

Senior Member
Joined
Sep 28, 2016
Threads
44
Messages
1,273
Reaction score
664
Location
Connecticut
Car(s)
2013 accord ex-l sedan, 2016 accord sport sedan, 2006 civic type r (in spain) and 2017 civic sedan ex-t w/manual transmission
Country flag
Yes, same here i get that weird compressor/whining sound when coming to a stop.

Is it normal? But when the fan is off, i don't hear it.

Mine is a Hatch.
Oh wait i remember the thread on this.. Its due to the mew super high efficiency condeser.. All new technology
 

civiclx17

New Member
Joined
Nov 7, 2017
Threads
0
Messages
4
Reaction score
0
Location
PA
Car(s)
17 LX CIVIC
Oh wait i remember the thread on this.. Its due to the mew super high efficiency condeser.. All new technology
Hate to get a old thread up again, but was that the issue and is it normal
 

zroger73

Senior Member
Joined
Apr 15, 2017
Threads
55
Messages
2,473
Reaction score
4,518
Location
United States
Car(s)
2019 MX-5 Miata GT-S, 2021 Ridgeline RTL-E
Country flag
This issue may have been covered on a previous thread but I'm giving it a shot. I have had my Civic Coupe for almost three months. Whenever the heater/ defroster is on, (haven't had the AC on yet) I get a whine that seems to be coming from the fan... but only when I am braking and coming to a stop. I don't hear it on acceleration, as I would have expected if it was the fan revving up.
Anyone else have this sound?
Is it normal or possibly an indication that the fan is not functioning properly.
Thanks for any input.
What you're hearing is the cooling fan mounted near the radiator and condensor. Unlike most vehicles that have relay-controlled, single or dual-speed cooling fans, the Civic has a single fan with a three-phase motor powered by a variable frequency drive. The high switching frequencies used in VFDs can result in turbine-like harmonics when the fan changes speeds. Under normal conditions, it would be a waste of energy for the cooling fan to run when the vehicle is moving since there is plenty of air flow to keep things cool, so the fan turns off or slows down. When you slow down and come to a stop, the cooling fan turns on or speeds up.

The cooling fan runs at slow speed whenever the A/C compressor is engaged. Unlike vehicles with cycling A/C compressors that turn on and off to maintain the correct evaporator temperature, the Civic uses a variable-displacement A/C compressor that runs all the time. Instead of cycling off and on, it continuously varies its capacity based on cooling demand.
 
  • Like
Reactions: jks

MarcOTT

Member
First Name
Marc
Joined
Jun 20, 2017
Threads
0
Messages
49
Reaction score
13
Location
CT
Car(s)
Odyssey - Civic - CRV
Country flag
What you're hearing is the cooling fan mounted near the radiator and condensor. Unlike most vehicles that have relay-controlled, single or dual-speed cooling fans, the Civic has a single fan with a three-phase motor powered by a variable frequency drive. The high switching frequencies used in VFDs can result in turbine-like harmonics when the fan changes speeds. Under normal conditions, it would be a waste of energy for the cooling fan to run when the vehicle is moving since there is plenty of air flow to keep things cool, so the fan turns off or slows down. When you slow down and come to a stop, the cooling fan turns on or speeds up.

The cooling fan runs at slow speed whenever the A/C compressor is engaged. Unlike vehicles with cycling A/C compressors that turn on and off to maintain the correct evaporator temperature, the Civic uses a variable-displacement A/C compressor that runs all the time. Instead of cycling off and on, it continuously varies its capacity based on cooling demand.

A Ha, so that is the turbine like whine I hear when I accelerate or stop. Should this radiator fan work without A/C operating, i.e., cooling cabin or defrosting windshield ?

 

 
Top