Motor Noise in Rear

[Deke736]

Hi all, I have a 2018 Tahoe RST Premiere 4x4 and I need some help. When I start up and sometimes while driving, I hear a motor sound coming from the rear. It sounds somewhat like a fuel pump or water pump, but it only runs for around 10-15 seconds. Any ideas of what it is?

Also, after parking I hear air pressure release in the rear as well. I have magnetic ride, so I know it can’t be an air pump or air ride. What would that be?

Sorry for the dumb questions, but I’ve been under the truck and I can’t figure out what these are!


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[humer101]

Hi all, I have a 2018 Tahoe RST Premiere 4x4 and I need some help. When I start up and sometimes while driving, I hear a motor sound coming from the rear. It sounds somewhat like a fuel pump or water pump, but it only runs for around 10-15 seconds. Any ideas of what it is?

Also, after parking I hear air pressure release in the rear as well. I have magnetic ride, so I know it can’t be an air pump or air ride. What would that be?

Sorry for the dumb questions, but I’ve been under the truck and I can’t figure out what these are!


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The air from the back id the auto leveling system that is to prevent that the truck sink in the back.

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[Big Mama]

You can also hear it from time to time while driving. The air compressor kicks on (the motor sound) to raise the back and the air sound you’re hearing is letting it out.

 

[humer101]

You can also hear it from time to time while driving. The air compressor kicks on (the motor sound) to raise the back and the air sound you’re hearing is letting it out.

I don't think that is any way you can hear the compressor click on & off while you are driving making noise with the wind and surface.

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[Deke736]

I didn’t think there was a compressor for the ride level on a 2018. I know it has the magnetic ride shocks. When I leveled the rear with the NorcalSS kit I never saw any air lines. Is the auto level system separate from the magnetic shocks?


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[humer101]

I didn’t think there was a compressor for the ride level on a 2018. I know it has the magnetic ride shocks. When I leveled the rear with the NorcalSS kit I never saw any air lines. Is the auto level system separate from the magnetic shocks?


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Yes, it is a compressor from 2009 till today, if you want to hear go to home depot and an 80 pounds cement bag in the back, and you will listen to the compressor lifting the car.
However if you don't have a magnetic ride, you will not hear the compressor, just confirm that you have magnetic ride.

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[Deke736]

Yes, it is a compressor from 2009 till today, if you want to hear go to home depot and an 80 pounds cement bag in the back, and you will listen to the compressor lifting the car.

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Thanks! I had no idea there was still a compressor back there. That’s definitely what it sounds like and it makes sense. I just didn’t know it was there on these newer Tahoe’s.


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[humer101]

Thanks! I had no idea there was still a compressor back there. That’s definitely what it sounds like and it makes sense. I just didn’t know it was there on these newer Tahoe’s.


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Tahoe's do not have a magnetic ride except the LTZ package.

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[Deke736]

Tahoe's do not have a magnetic ride except the LTZ package.

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The Performance packages do too. I have a RST with the Performance Package.

http://gmauthority.com/blog/gm/chev...2018-chevrolet-tahoe-performance-package/amp/

I know it’s there because I swapped the rear springs and the suspension wiring for the system is the same as on my Camaro ZL1.



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[humer101]

The Performance packages do too. I have a RST with the Performance Package.

http://gmauthority.com/blog/gm/chev...2018-chevrolet-tahoe-performance-package/amp/

I know it’s there because I swapped the rear springs and the suspension wiring for the system is the same as on my Camaro ZL1.



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Can you show a clip of cold start on sport exhaust muffler?

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