cyber_man

I have a 95 LS400 with about 65,000 miles. The car will always make this humming sound after the engine is turned-off. This humming sound will come on and off intermittantly for several minutes, coming from under the hood.

The 95 LS400 does not have any electric fan that will remain 'ON' after the engine stops, right?? Just puzzled.

Rice

If you have air suspension, thae humming might be the air compressor.

brian3268

Abcedefghij

Rice

Just thought of something else...
Try opening the hood while this is happening and listening for the source of the noise. That's the first thing I would do.
Since you don't have air suspension, there are no other moving parts under the hood once the engine is shut off. Electric cooling fans don't work after shut down either (like on some other cars). This means that the only moving part left is the antifreeze. When engine heats up, the antifreeze expands and excess is transfered to the overflow tank. When the engine is stopped, it begins to cool and antifreeze is sucked back into the system from the overflow tank. This is what sometimes makes the noise on other cars, altough I never heard it on Lexus.

P.S.
cyber_man, 65,000 miles on an 8 year old car... In California... Hmm... Unless you are the original owner or you bought it from your grandma, I'd say you've been cyber_scrued. Hope this isn't the case for you though.

brian3268

Abcedefghij

Lexified

its the a/c releasing the excess pressure I believe. Try turning off the car after the a/c has not been used

Lexkost

Next time you here the humming sound use you remote to sent the alarm.....see if this stops it !

Lex-Fiend

I have a 1997 LS and I was wondering if anyone has found out what this problem is?

TJW98LS

iTrader: (1)

It is a completely normal sound guys. My 99 Has it and my 98 Had it as well. Although I have not figured out what makes the sound, I know its nothing to worry about.

lxtauto

possible abs actuator releasing pressure