Question about Hyundai Motor 1996 Elantra

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Hyundai Elantra Antifreeze Leak

   I had a leak in my coolant system ( adding about a 1/2 gallon of antifreeze a month or so) and it was coming from around the water pump area.    I took it to a mechanic and had it pressure tested twice with no problems. They told me that some water pumps leak a bit after time. Offered to replace pump but informed me that it was a 6 hour job plus cost of part and that I may be better off just topping off the coolant weekly.    I decided to buy some radiator sealant (Prestone) and it took care of the leak! I was overjoyed....however.....    Since then (about two weeks) I have seen major fluctuations in my temperature gauge (runs very near red) when I am at a stop sign/light. As I drive the gauge returns to normal.    I have also noticed that the fan NEVER runs anymore. I can go for a drve for an hour, come home and park it, and no fan. Before the sealant the fan would be running after a 20 mile drive.    The last oddity that happened was yesterday. I was on my way home form work and after the first light the gauge was not going down like it normally does. I turned on the A/C on a whim and the gauge almost immediately went down.    So what *** you think? Sensor, thermostat, fan motor? I wish I could put a bullet in it and leave it for dead, but unfortunately that isn't n optiion.

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  • soap_box Oct 14, 2008

    Sorry, My husband changed the waterpump at the end of August. I never got a response here and it completely slipped my mind to update the issue as resolved! 

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If the fan NEVER comes on anymore, then that's why your engine is getting hot. You need to figure out if the fan switch relay is bad, or if the motor on the fan is bad, or something in the electrical system with the fan is not working. if the temp. sensor wasn't working, then your guage wouldn't work. I would never have used any type of stop leak in an engine cause it can clog up your return ports from your engine's cooling system and then you have real problems later with your engine. There is so much to have to check with this vehicle to see what's the problem. However, you can check to see if the fan motor works, by unplugging the fan electrical plug, and using a direct wire from your battery to give it electricity to it directly, if it comes on, then the motor isn't the problem, it's something else like a relay or something. you can also use a test light to check the plug for the fan coming from the engine to see if it's getting any electricity to it with the key turn on, just plug in the test light to each wire in the harness coming from the engine, and making sure you have a good ground connection your tester by clipping the tester to the neg battery cable, then touch each wire to see if either of them light up the tester. if they don't, then you are NOT getting fire(electricity) to the fan through the wiring which could indicate a fan relay gone bad, broken wire someplace or burned wire someplace. Takes alot to track down electrical stuff, takes time, alot of knowledge and patience. i would take your car to the dealer, unless you know a really good shop that does this kinda work. You need to be informed of this though....YOUR HEAD ON YOUR ENGINE IS MADE OF ALUMINUM AND IT DOESN'T TAKE MUCH OVERHEAT TO WARP IT AND CAUSE MORE DAMAGE THAN YOU CAN AFFORD TO PAY OUT ON . SO DON'T KEEP DRIVING THE CAR UNTIL IT HAPPENS. GET IT TO A SHOP AND MAKE SURE THEY TEST THE HEAD FOR LEAKING WATER AND LET THEM KNOW IT'S RUN IN THE RED BEFORE.... THAT'S A NO NO FOR ALUMINUM HEADS... WILL WARP THEM IN A HEARTBEAT. GOOD LUCK.

Posted on Oct 13, 2008

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