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Mustang GT Overheating (long)

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Old 07-30-2006, 06:56 PM   #1
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Default Mustang GT Overheating (long)

My Mustang started overheating about two weeks ago. It has overheated on me four times now. Each time it has been very hot outside, and I've been in stop and go traffic. At first it was the first time I ran the A/C this year, but it happened last night on Lake Shore Drive in traffic without the A/C on. The car temperature drops when I'm moving on the expressway or on the road not stopped at a light, but once the car is stopped it doesn't take long for the temperature to rise.

I have checked the coolant for air bubbles several times, and even replaced the thermostat with a fail-safe thermostat. I have been reading that my pressure cap may be falty, and was wondering if anybody with a highly modified Mustang can offer some insite. Could my pressure cap need replacing with a better one now that my car has all this work done to it? Also, can someone send me a pic of the thermostat proper installation position. I put the one I have in the way I took out the original, but I am wondering if the shop may have put it in backwards in the first place.

Lastly, Sutton HP who tuned my car is saying that I need to get an electric water pump. I ordered one on Friday that is supposed to keep my car 30% cooler, and is guaranteed for 50,000 miles. I've had my GT since August 02 and have 12,780 miles on it, so the miles don't worry me. I just don't know if the $360 pump is the solution to my problem. I ordered it just in case, but I am curious to know if my pressure cap may be a problem, or if my thermostat may be. Some feed back and advice please.

~Gixxer
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Old 07-30-2006, 07:16 PM   #2
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Default RE: Mustang GT Overheating (long)

A cap that does not seal properly or is letting lose before the proper PSI is reached can cause overheating. But based on you saying the car does fine once you get up to Hwy Speeds leads me to belive that the Fan is not working properly so i would check that out.

As for the thermostat usually they go with the long end down. Also after you swapped the thermostat did you let the car run with the radiator cap of and get to proper operating temps to allow the system to burp?

Richard
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Old 07-30-2006, 07:20 PM   #3
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Default RE: Mustang GT Overheating (long)

When you up the HP you up the heat....if the fan checks out in working order try setting it to turn on earlier in the tune. Also a 2 core radiator isn't a bad idea as well as some redline water wetter additive.
oh you signed your name as gixxer....how cute [8D]
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Old 07-31-2006, 12:28 AM   #4
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Default RE: Mustang GT Overheating (long)


Quote:
ORIGINAL: 06GT4RAD

A cap that does not seal properly or is letting lose before the proper PSI is reached can cause overheating. But based on you saying the car does fine once you get up to Hwy Speeds leads me to belive that the Fan is not working properly so i would check that out.

As for the thermostat usually they go with the long end down. Also after you swapped the thermostat did you let the car run with the radiator cap of and get to proper operating temps to allow the system to burp?

Richard
I am going to have to look into this fan. the thermostat is in correctly, and I did let the car run to get the burps out.
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Old 07-31-2006, 12:32 AM   #5
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Default RE: Mustang GT Overheating (long)


Quote:
ORIGINAL: 06GT4RAD

A cap that does not seal properly or is letting lose before the proper PSI is reached can cause overheating. But based on you saying the car does fine once you get up to Hwy Speeds leads me to belive that the Fan is not working properly so i would check that out.

As for the thermostat usually they go with the long end down. Also after you swapped the thermostat did you let the car run with the radiator cap of and get to proper operating temps to allow the system to burp?

Richard

I would have to agree with him. It sounds like your fan might be the culprit.
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Old 07-31-2006, 12:35 AM   #6
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Default RE: Mustang GT Overheating (long)


Quote:
ORIGINAL: droptoppony

When you up the HP you up the heat....if the fan checks out in working order try setting it to turn on earlier in the tune. Also a 2 core radiator isn't a bad idea as well as some redline water wetter additive.
oh you signed your name as gixxer....how cute [8D]
I have redline additive already, but don't have a two core radiator. How much does a 2 core radiator run?
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Old 07-31-2006, 05:54 AM   #7
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Default RE: Mustang GT Overheating (long)

Quote:
ORIGINAL: 02StanGT
I would have to agree with him. It sounds like your fan might be the culprit.
Yea, I am going to get it to Sutton very soon and see if they can't look at my car's fan. Sigh...the faster you make your car, the bigger the can of worms you are taking a chance of opening.
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Old 07-31-2006, 05:57 AM   #8
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Default RE: Mustang GT Overheating (long)

True dat
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Old 07-31-2006, 08:21 AM   #9
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Default RE: Mustang GT Overheating (long)

Maybe your cooling system needs to get flushed? Are you using any of that extended-life coolant? That stuff is poison to any cooling system. Debris/crap in your cooling system would also cause overheating issues...
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Old 07-31-2006, 02:15 PM   #10
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Default RE: Mustang GT Overheating (long)


Quote:
ORIGINAL: myk

Maybe your cooling system needs to get flushed? Are you using any of that extended-life coolant? That stuff is poison to any cooling system. Debris/crap in your cooling system would also cause overheating issues...
Now, just to regular stuff. I'm using PEAK.
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Old 07-31-2006, 02:35 PM   #11
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Default RE: Mustang GT Overheating (long)

Hmmmm, I am leaning towards the fan as well. Did you put a new water pump in when you had all your engine work done?
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Old 07-31-2006, 05:41 PM   #12
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Default RE: Mustang GT Overheating (long)

Check the fan. When the car is hot just watch it with the hood up to see if it comes on.
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Old 07-31-2006, 11:14 PM   #13
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Default RE: Mustang GT Overheating (long)


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ORIGINAL: code3GT

Hmmmm, I am leaning towards the fan as well. Did you put a new water pump in when you had all your engine work done?
No, I did not put in a new water pump. I am using the same one I always have. I have ordered a new electric one though.
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Old 07-31-2006, 11:16 PM   #14
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Quote:
ORIGINAL: gjscott

Check the fan. When the car is hot just watch it with the hood up to see if it comes on.
Gonna go do that in a bit.
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Old 08-01-2006, 12:24 AM   #15
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Default RE: Mustang GT Overheating (long)

I had the exact same problem...

i started but cutting the center section out of my t-stat, i run 100% water with water wetter, new pressure tank cap, replaced the radiator...


it ended up being some ****ty wiring job someone did to try and fix the fan, it was basically turning off randomly and not coming on when it needed too. it would ALWAYS overheat when i was sitting at a light, CHECK THE FAN.
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Old 08-01-2006, 12:36 AM   #16
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Default RE: Mustang GT Overheating (long)

OKAY! I started my car up and let it warm up. My radiator fan DID turn on, and when I turned on the A/C the a/c fan turned on also. The car was blowing cold air too! Now, after letting the car run and run, I gave it some revs and let her get pretty hot with the air on. All of a sudden my radiator fun stops moving and my A/C turns hot! Mind you, both fans work, but something is shutting them off when they get up to temp very hot temperatures. Now what?!
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Old 08-01-2006, 12:38 AM   #17
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Default RE: Mustang GT Overheating (long)

they should only spin WHEN it gets to a tempature like...190-210 degrees. if your radiator fan is spinng while its cold or semi-hot, and then shutting off when its hot, thats your problem, maybe in the tune, or some wiring like that other guy.
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Old 08-01-2006, 12:41 AM   #18
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Default RE: Mustang GT Overheating (long)


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ORIGINAL: ackuric

they should only spin WHEN it gets to a tempature like...190-210 degrees. if your radiator fan is spinng while its cold or semi-hot, and then shutting off when its hot, thats your problem, maybe in the tune, or some wiring like that other guy.
Temp sensor maybe?
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Old 08-01-2006, 12:56 AM   #19
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Default RE: Mustang GT Overheating (long)

im sure you have a tuner...
anyways

fan is programmed to turn on at a certain temp, and turn off at a certain temp, you want it on at 190-210+, off at 189 and below. i dont know if the temp sensor can fault and make it read low temps when its hot, and vice versa.
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Old 08-01-2006, 01:01 AM   #20
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Default RE: Mustang GT Overheating (long)


Quote:
ORIGINAL: ackuric

im sure you have a tuner...
anyways

fan is programmed to turn on at a certain temp, and turn off at a certain temp, you want it on at 190-210+, off at 189 and below. i dont know if the temp sensor can fault and make it read low temps when its hot, and vice versa.
Okay, well I am going to get it checked out asap, because I had it tuned by Sutton HP.
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Old 08-01-2006, 01:01 AM
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