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#14733 05/11/2002 3:23 AM | Joined: Aug 2000 Posts: 197 Member | | Member Joined: Aug 2000 Posts: 197 | I have the bypass and intend to dispense with it when I replace the water pump. One point to note is that the original heater thermostat is fairly restrictive compared to the aftermarket on/off ball valve so if you use the bypass you may be further limiting flow through the heater. The gmc parts manual lists a fitting to block the bypass when installing a heater so I would venture a guess that it isn't all that important. 
Jason
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