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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#39568 02/24/2002 6:40 AM | Joined: Aug 2000 Posts: 197 Member | | Member Joined: Aug 2000 Posts: 197 | I have what looks like it might be a water pump bypass on my gmc. Didn't notice/think much about it til today when I pulled it out of storage and was checkin it over. It connects from the lower part of the thermostat housing to the water pump. My truck likes to run warm (190) on the interstate and I am wondering if this bypass is really necessary since water is going around in circles instead of through the radiator. Before I blindly rip it off I have to ask: Why did gm put it there in the first place?
jason
Jason
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