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Old 07-18-2013, 12:47 AM   #1
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Mustang overheating!

Hey guys I need some advice. I recently bought some BBK under drive pulleys for my 2000 GT and ever since they got installed my car has been over heating. I had the thermostat and temperature sending unit replaced as well, figuring this could solve the problem, but now my fan won’t work and my car still overheats. The only time my car will not overheat is when the sending unit is unhooked, and then the fan will start working. I just need to know something so I can fix this.
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Old 07-18-2013, 01:00 AM   #2
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Strange. You say it has a new sending unit huh? Was the fan not working before the pulleys were installed? Or did you just notice it?
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Old 07-18-2013, 01:06 AM   #3
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Strange. You say it has a new sending unit huh? Was the fan not working before the pulleys were installed? Or did you just notice it?
I replaced the sending unit. I believe my fan was working, but just to make sure, I used the fan out of my cobra and it worked as well.
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Old 07-18-2013, 01:14 AM   #4
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I replaced the sending unit. I believe my fan was working, but just to make sure, I used the fan out of my cobra and it worked as well.
And the tfan will run if you unplug the sending unit? Does it cycle on and off or just run constantly?
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Old 07-18-2013, 01:22 AM   #5
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And the tfan will run if you unplug the sending unit? Does it cycle on and off or just run constantly?
Yes, that's correct. The fan does run constantly when the car is sitting still. I tried driving it down the road, and the fan quit working and antifreeze went everywhere.
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Old 07-18-2013, 01:37 AM   #6
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This is a tough one. How about the tune? Is it stock or do you have a tuner?
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Old 07-18-2013, 11:25 AM   #7
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I don't have a tuner yet, but it's on my list!
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Old 07-18-2013, 11:43 AM   #8
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I looked in my repair manual and there is a relay that could be at fault. I can't remember the name of it at the moment. I wrote up what the manual said last night but the battery on my phone died just as I was about to submit the post. Lol. I lost everything and said F it, it was late. Ill try to post what I found a bit later if no one else chimes in.
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Old 07-18-2013, 11:49 AM   #9
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Thank you, it would be appreciated.
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Old 07-18-2013, 11:55 AM   #10
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No problem
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Old 07-18-2013, 09:05 PM   #11
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Ok. First, there are two coolant sensors. As you are looking at the engine, from the front, the one on the right is the sensor for the computer. The one on the left is the sending unit for the temperature gauge. Obviously, its the one on the right that the computer gets its information from to control the fan. Hopefully that is the one you replaced. If that is the case, the next place to look is the Constant Control Relay Module. This is located IN the right fenderwell, under the plastic inner fender shield. There is a test procedure for this if you are handy with a volt meter. If not, I recommend taking it to someone who can properly diagnose the problem without taking your car halfway apart and replacing unnecessary parts. Make absolutely certain that you replaced the correct sensor. That is the most common cause for the fan not coming on at the correct temperature.
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