Car stopped running on the freeway. I pulled over and the check engine light came on and went off. I tried to start it and it wouldn't. Let it sit for a moment and it started up just fine. What could this be?
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Unplug the fan on sensor. It should have one green wire and one black wire. Use a paper clip and jump the two wires. Turn the key to the run position, the engine does not need to be running. Does the fan come on? If not check the green wire for 12 volts and the black wire for ground. If there is no ground than run a new ground wire. If the is no power check the heater/air conditioning fuse in the under dash fuse block. If there is power and ground make sure both the cooling fan fuses are good and both the cooling fan relays are good.
I suppose its possible the alternator stopped charging the battery enough at the low engine speed but then worked on the way home. The alternator will charge 12 - 13 volts at idle, but you could have enough accessories and the cooling fan running to use more voltage or amps than it is producing. Stopping at a traffic light for a couple of minutes does not hurt anything since the battery is usually fully charged. But idling for an hour or more with everything on could run the battery down. You might want to have the computer checked for codes even tho the check engine light may not have been on. Also have the alternator and battery tested again to see if something happened while in heavy traffic.
I have a 2002 Honda Civic Ex, it has been over heating but only in stop and go traffic, never on the freeway, i have replaced, timing belt, water pump, cooling fan relay, cooling fan switch, flushed radiator. There is no white smoke coming from the tail pipe and the oil is clean, when the car gets hot i can smell the coolant pretty strong, car has never completly overheated gets about 3/4 of the way til red.