Sounds like you replace the temperature sending unit(for the gauge on dash) what you need to replace is the Temperature sensor for the computer (ECM)
SOURCE: code PO118 chevy blazer 2002,after intake gasket replacement
hi john , sure sounds like you may have unplugged the coolant temp
sensor or didn't get a good connection at the sensor , location , in
between two exhaust ports on the side of the engine that has the oil
fill and pcv .
J5
SOURCE: 1994 Chevy Cavalier runs rough with a bunch of codes
24 is speed sensor. Has no bering on a stationary car.
15 is the coolant sensor circuit. (which you already replaced)
66 is AC refridgerant.
19.... i have no idea.
From what you have described, i would almost have to say it's the idle control sensor, or intake manifold vacuum leaks. Make sur everything is tight, and wiggle all the hoses around to make sure none are cracked or loose. Use a length of fuel hose held to your ear, or a stethoscope if you have one, and listen and wiggle hoses with the engine running. If there are no leaks, go for the idle control sensor. If that doesn't do it, it'll be the mass air flow sensor. But usually when they act up, the car will start and die, start and die. Good luck.
SOURCE: 1999 Chevy Cavalier Z24 2.4L cooling fan inoperative
yes you could have a bad ECT or the relay could be bad it sounds more like the relay is heating up and kicking out
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