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Is there a drain tube besides the drain on the firewall that i can try to unclog? Ive tried a thousand times to unclog it but its not working. And why do the cobalts have a double barrel drain from the firewall? There's actually two sides to the drain and I can get in the right side (drivers side) but cant get anything on the left side.
 

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The evaporator drain tube is located on the right side of the firewall, or passenger side. If it’s got debris in it, it will likely have to be cleared from the inside. You will need to remove the dashboard and hvac box and open it up. Unless you can get a super strong vacuum to suck it through, but it doubt it.
 
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