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Could be your thermostat, turn the heater on it the car, let it warm up and drive the car, see if the hot air gets cooler, there are two sensors for the cooling system, the single pin sends signal to the gauge cluster to show you the temp, the other sensor (CTS) is a red 2 pin connector, right next to the the black single pin connector, the coolant temp sensor (CTS) is the 2 pin, you need to check that one, it sends signal to the ecu telling it if the car is warm or cold, if it malfunctions it will screw with your car, mine malfunctioned and it was making my ecu think my car was cold and in result it was dumping excess fuel like if my car was in the warm up process even though my car was and normal operating temp causing my car to flood with fuel and die, idle badly, fuel economy was compromised badly, and it wouldn't rev.
To test it, warm the car up and go under the hood disconnect the red two pin connector and see if anything changes.... Hope this helps
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