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Old 10-31-2015, 07:23 AM   #1
JudgeM
 
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Drives: 2005 Toyota Vitz RS
Join Date: Jan 2012
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Question humming noise from the back

Hi All,

For all this time I;ve been hearing this humming noise, I thought it is the radiator fan. One day however while standing outside, I heard it louder from the rear of the car. Its a noise that comes on, then goes off. hence why I thought it was radiator fan.

Is there some pump or fan or something in the rear of the car that only comes on sometimes ?
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Old 11-14-2015, 01:00 PM   #2
BLH
 
Drives: 2007 Yaris Sedan
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Location: CT
Posts: 271
Probably hearing the fuel evaporation leak test pump.
My manual indicates a test is done about five hours after turning off the car.
The hum is probably you hearing the leak detection pump turning On for several minutes.

Last edited by BLH; 11-14-2015 at 01:17 PM.
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