They should open fairly quickly once they hit operating temp. If one is dragging open, once under pressure it may not open at all. If there out and unknown age, change them to be safe. And I'm a stickler for oem for parts like pumps and stats. Had to many aftermarket impellers spin for my liking, and had some aftermarket stats corrode out in just a few years, so I stick to oem there too.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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