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Old 10-14-2010, 08:42 PM   #2
old_master
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Re: Temp gauge acting funny and van surging

Your 2000 4.3L has 2 temp sensors. The one for the ECM is located next to the thermostat housing. The sensor for the temp gauge in the dash is located in the driver side cylinder head between cyls 3 & 5. Two totally separate circuits, not related to each other in any way.

Might want to check the connections behind the underhood fuse panel, common for them to corrode and loosen up. There's a wad of red wires back there, check them all very close.
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