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I have never noticed this before. Cold startup noise lasts about 3 seconds comes from the passenger side. 2006 Monte Carlo. 13K miles

What might cause this?
 

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there is a bulletin for this. you have to remove one of the heater hoses and fill up the hose with coolant, and that will fix it. not sure all the details, but the ones i have had, it has fixed the problem.
 
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