09-26-2010, 09:01 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,405
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The bypass hose allows water to circulate through the block while the thermostat is closed. It allows for a more even warm up without hot spots. You indeed may have a sticking thermostat. You should consider using a "Balanced Thermostat" style thermostat. Better flow and I believe they fail "open". Would be interesting to run without a thermostat and see if the temp spiking still occurs. Be sure to install any new thermostat with the weep holes on the flange at the top and install the thermostat in the correct spring orientation. (engine vs. radiator)
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