C.T.S. Coolant temp sensor

6000 Le 135k miles. '90
Is the coolant temp sensor in the water neck? Reason I'm asking is I had a code come up and used a code reader that will flash the engine service light, then match up the flashes with the code in there book. The book states it's a bad C.T.S. but they say it's in the engine block. Just want to make sure. Thanks.

Upper front of engine kind of behind the thermostat housing. Drivers side next to the Throttle Body.