Today I moved on to the next issue with my car. The gauge for the temperature shows above 270 all the time. I noticed that the sensor on the black line coming from the water pump was broken in half. I bought a coolant temperature sensor and when I went to remove the old one, I noticed that there were two almost identical plugs, the only difference was the squared off portion for the sensor. So I replaced the coolant temp sensor, but wondered what goes into the other plug. I read some posts and it says the ACT goes there, but then another talks about the ACT is in the Mass Air Flow, which I have on my car. So my two questions are, do I need to hook the ACT sensor up to the connector, and if so, where does it go, as I do not see a spot near where this connector can reach. Second, I learned that the gauge inside is controlled by the temp sending unit, which I found behind the distributor area. Is there a way to test this to determine if its bad, like the resistor test for the fuel sending unit? Thanks in advance for any help, you guys have already helped me solve so many issues with this car.