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Old 08-07-2020, 03:49 PM   #5
sweetk30
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Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
Re: Vortec Coolant Bypass

my new gm L31 i installed was burping and girggling until i did the little bypass hose from the water pump to intake like a BBC engine has from the factory .

i read a lot and asked a lot on this and it seems 50/50 mix of problems or no problems so try it and you will know . mine would pass gas in to the overflow bottle and then when the blower fan was on you would smell coolant like a bad heater core leaking . also if the vehicle is quiet i was hearing the rad cap letting it past .
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