2021 Tahoe RST Duramax LOUD ticking sound before starting car, “climate system defogging reduced” notification

msnyder724 · Aug 27, 2022

I just got our Tahoe a year ago. It has been serviced back in May. This sound has been on and off since then, but now is very consistent. It is so loud and will last from 30 seconds to 2 minutes. It will stop after driving a certain speed. I’ve noticed a slow oil leak for the last two days. The sound is more prominent on passenger side. A “service climate system defogging reduced” notification popped up yesterday. Anyone know what this may be? AC unit?

Doubeleive · Aug 27, 2022

sounds like ac pump, you can take the belt off and see if the noise is gone, take it to the dealer it should be under warranty.

steiny93 · Oct 26, 2022

loud ticking before you start? does it always happen or just when you get into the vehicle? where is it coming from? seems like the dealer should be able to find the source if it lasts for a couple minutes

suterusu · Oct 27, 2022

Loud ticking combined with defogging/climate error would lead me to believe their is an issue with the A/C compressor clutch. The clicking is probably the clutch/solenoid that engages the compressor going through a pre-startup check.

abbott20 · Jul 24, 2024

msnyder724 said:
I just got our Tahoe a year ago. It has been serviced back in May. This sound has been on and off since then, but now is very consistent. It is so loud and will last from 30 seconds to 2 minutes. It will stop after driving a certain speed. I’ve noticed a slow oil leak for the last two days. The sound is more prominent on passenger side. A “service climate system defogging reduced” notification popped up yesterday. Anyone know what this may be? AC unit?

Did you ever get this fixed? I'm having a similar issue.

tschultz3030 · Sep 12, 2024

Did you get this fixed? My 2021 Z71 suburban is doing the same thing.

2021 Tahoe RST Duramax LOUD ticking sound before starting car, “climate system defogging reduced” notification

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