98 temp sending unit - Mustang Evolution

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Old 07-27-2013, 07:35 PM   #1
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I got a 98 gt auto

Had a guy tell me that if I replaced my temp sending unit it well fix my hot and cold gauge on the dash, which its is not fix, well he replace it (broke the old one) and when I crank the car my gauge still didn't work
But I have notice the when you crank the car as soon as you crank the car the fan to the radiator kicks on and stays on, also I don't know if the same reason but my ac will not blow cold anymore it did when I was on the was to his shop but not anymore



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Old 07-27-2013, 08:40 PM   #2
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Anybody? I'm really wanting to know if the guy changing out the temp sending is because of the ac not blowing cold anymore and why the fan to the radiator is always running as soon as I crank my car
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Old 07-27-2013, 08:52 PM   #3
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Put key in ignition press and hold the trip reset and turn the key to the run position but do not start car. Keep holding trip reset until the dash reads test then release the trip button. This will start the gauge self test. All the gauges will go over to the right side for test. If yours doesn't then the gauge itself is bad. Also you can press the trip button to cycle thru a bulb test and lots of other info.
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Old 07-27-2013, 09:15 PM   #4
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Thanks buddy I will look into in the morning will it work if my gauge always looks like this?


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Any idea why my radiator fan always stay on?
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Old 07-27-2013, 10:14 PM   #5
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It's possible if the gauge us shorting out causing the sending unit to ground out and the fan defaults to always run so as not to burn up your engine. Not really sure but the gauge should not go that far left in my opinion
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Old 07-27-2013, 10:44 PM   #6
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Quote:
Originally Posted by Vmcgrath View Post
Thanks buddy I will look into in the morning will it work if my gauge always looks like this?

Any idea why my radiator fan always stay on?
My gauge looks like that when the car is cold but the it works fine when warmed up
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Old 07-28-2013, 09:19 PM   #7
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Well still no luck idk what to do now but stang does not want to start anymore its really making me mad
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Old 07-29-2013, 07:47 PM   #8
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There are two ect on my 96 i replaced both of mine. I would recommend checking the other one as well. As for the fan staying on at all times check the one he fixed he may have "fixed" it but fans come on if u disconnect the temp sensor and do yours stay on at all time even with the key on engine off? Here are mine

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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 07-29-2013, 07:49 PM   #9
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In my car i replaced both sensors cause mine did that as well. After that it does take a while for it to read correctly mine did it took about 5 days and haven't had an issue in iver a year and a half so far
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 07-29-2013, 10:19 PM   #10
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No it doesn't do it when the car off only when I crank it I might go ahead and change the other one I think the guy at the part store said ones for the fan and other for the gauge when this guy changed it for me he put on like white Plummer tape or something like that but any idea about my ac it stop blowing cold after he replaced the temp sending unit
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Old 07-31-2013, 05:29 PM   #11
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Originally Posted by 1996mustang View Post
There are two ect on my 96 i replaced both of mine. I would recommend checking the other one as well. As for the fan staying on at all times check the one he fixed he may have "fixed" it but fans come on if u disconnect the temp sensor and do yours stay on at all time even with the key on engine off? Here are mine
Which one is the gauge sensor and which on is the fan sensor ?
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Old 07-31-2013, 06:58 PM   #12
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here is a diagram of the sensors
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1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 07-31-2013, 08:23 PM   #13
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Thanks I finally got it turns out the person that replace the sensor replaced the wrong sensor making my car not to crank also when I unplugged it it cranked right up but made my fan stay on and keep running and my ac to stop blowing cold but I got it back to normal but the bad news is still no working hot and cold gauge which I was trying to fix in the first place
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Old 07-31-2013, 08:31 PM   #14
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Well give it a couple of hours or a day to ensure the gauge works if it was replaced. If anything replace the other sensor. Watch your gauge for any small changes if any as well mine stayed pegged to the cold side for a long time before it went back to norm when i changed both if mine
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o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 07-31-2013, 08:35 PM   #15
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I did change both of them and yes mine it pegged all the way to the cold as well, I just hope mine has any luck like yours did but I will keep a eye on it but thank you for all your help it really means a lot
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