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|my electric fan came with a 165 -185 thermostat, my heater hose line had old rusted out manual on/off valve which i removed to replace with my thermostat tee fitting. (ps the valve was rusted in close position). michigan temps are not that warm, so needing a heater is required. during the summer i keep my dash heater slide bar set to mostly defrost setting or closed.ps if your heater valve is working, putting the thermostat forward of the valve should not affect its performance even if the valve is open or closed position.