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Rediator fan should turn on when the temperature sensor goes overs certain value. Probably when you are using a heater, outside temperature is quiet low and air cooling helps to keeps water temperature lower then the minimum to turn the fan one.
Now , this is just a guess! To se sure, turn on your car parked and check the temperature. If goes over the value where fan should turn on, you've got a problem with the termostat or the relay.
I looked at info for the 2.5L engine. The violet wire at the coil pack is primary voltage, goes hot with on. Use a test light, is that wire hot? If not back track the circuit. Check fuse 4--20 amp in the diagram for voltage, key on, also check if fuse is blown. Note the diagram. Sorry if diagram is a little small, maybe you can enlarge?
Sorry Olivia this is probably going to be one of those cases where it's an intermittent problem you're going to have to wait until it completely stops working to find. When it goes out try banging the dash near the controls, if it comes back on we know it's a bad connection but finding exactly where won't be easy
All I can think of is something is plugging up your heater core. When you turn it on--the coolant tries to rush into the heater core (which in case you didn't know is behind your glove box) and it pushes said obstruction to the point where it closes off the line.
When you shut the heater off--the coolant is not trying to pass tthough the heater core any longer--so the obstruction follows gravity to the lowest point away from the heater core.