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Super Moderator
2021 TB Zues Bronze Activ
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286 Posts
Discussion Starter #1
I am at 5500 miles now. For some time now when the car has sat over night when you first start it you can here a few seconds of water swoosh right in from on the drivers side dash. I know it is the cooling system, perhaps heater core filling as water pump moves the water. I assume there is not reason to worry. I just ask because I don't hear it in others cars I own.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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232 Posts
My Colorado does the same thing and I've heard it once or twice in the Trailblazer although it's not as noticeable. It's just air pockets inside the cooling system, mainly the heater core.

Steve
 

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Super Moderator
2021 TB Zues Bronze Activ
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286 Posts
Discussion Starter #3
it is only been more noticeable since the temps outside have dropped.
 
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