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Discussion Starter · #1 ·
Recently picked up an 03 Duramax and am slowly fixing all the things wrong with it.
The coolant bypass valve above the thermostat (#7 in this diagram) has a hose that goes up and to the back, mine has a hole in it.
Whats that hose part number?
I cant find the hose in any diagram.
Or if you could point me to the diagram that would be helpful. Didn't see it on www.wholesalegmpartsonline.com
 

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just use bulk coolant line and hose clamps.
That's a coolant return line from the turbo.
 
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