It is your blower motor resistor. It's located below your dashboard on the passenger side. It's a 3 inch black piece with two screws holding it to the panel under the dash. It will have a wire harness plugged into it. Buy a new one (about $25), unscrew the old one, disconnect the wiring harness from old resistor and plug into new one. Screw new one in. Expensive for such a simple part but a helpful and super easy fix. Takes 1 minute to locate, 2 minutes to change. Sure to fix your problem.
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Out of antifreeze like you lost it all? Buy a gallon of full strength. Take it home and mix it with 1 gallon of water. Now you have 2 gallons. Assuming you didn't some how lose all of your coolant, this is more than enough for you. I don't think you can buy less than 1 gallon of coolant anyway.
fan relay more than likely, but I think think it would stay on all the time even with key off, could be wrong tho. sounds to me like you have your air condition on, or heater set to defrost as defrost basically runs the air conditioning compressor and cooling fans when defrost is on.
Top rad hose next to the engine, and yes you might want to drain the coolant before changing the
t-stat, there are 3 - 10mm bolts that hold it on, if you strip them you can get a longer bolt and install a nut to fix it. It takes a while to fill that system and for the fans to kick on, make sure you turn the heater on high when refilling with coolant.
No, it should only turn on when the temperature switch tells it to. On a hot day you may hear it running even after shutting off the engine. The fan is set up so that when you are moving at enough speed the fan shuts off to save energy, when you slow down or stop the fan should come on to maintain airflow. If you check it at this point yes it should be running. When you start it cold the fan will not turn on for maybe 10 or more seconds when the engine starts to warm up. Hope this helps.
Things to be concered about; 1.) the fan never seems to turn on. This will cause your engine to overheat when you stop. 2.) Your heat is not working. The heat going away can be a sign that you antifreeze is low and that you are about to overheat.
Check to see if their is power and ground at blower motor with test light. It is located under glove box area.you can make a test light with a tail light bulb and two wires. If no power the fan resister, fan switch, fuse or wiring is bad.