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Old 3/19/17, 05:55 AM   #1
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Thermostat

Hello, its time to change thermostat. Everything is stock on engine so, will an aftermarket one, like Mishimoto wich open at 160 will help , or just stay with oem part ? The summer here its hot , if this matters .
Thank you !!
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Old 3/19/17, 12:05 PM   #2
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Dan, as long as it's a good one it should be OK. I usually just stop by the Auto Parts store, and buy mine.
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Old 3/19/17, 01:47 PM   #3
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If your car is stock and a driver, go with OEM. The car is designed to operate at a higher temp and efficancy will suffer because it is colder. If you truly wanted the car to run cooler you would also need the PCM programmed to turn on the fans at lower temps as well.
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Old 3/19/17, 05:28 PM   #4
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Quote:
Originally Posted by SplitSecond View Post
If your car is stock and a driver, go with OEM. The car is designed to operate at a higher temp and efficancy will suffer because it is colder. If you truly wanted the car to run cooler you would also need the PCM programmed to turn on the fans at lower temps as well.
Thanks Split, I didn't realize that. It's true, you do learn something new everyday.

I've never bought a thermostat for a Mustang, so I figured it would be the same as the others I've purchased.

Last edited by wanted33; 3/19/17 at 05:30 PM.
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Old 3/19/17, 06:20 PM   #5
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Been running "OEM" 190 degree stat on my S/C 06 GT for well over 11 years.. Haven't run across any issues as of yet.. There's also no mention nor recommendation from Saleen to upgrade from OEM to lower degree stat as apparently they don't consider it as a requirement or necessary
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Old 3/19/17, 07:41 PM   #6
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Thanks Split, I didn't realize that. It's true, you do learn something new everyday.

I've never bought a thermostat for a Mustang, so I figured it would be the same as the others I've purchased.
Yup, most manufacturers have designed their engines to run around the boiling temp of water, around 200. Engines will run around 10-15 degrees hotter than what the termostat is set at so most cars will have a 185-190 degree thermostat. That is just about as high as you can get without needing more complex and expensive cooling systems.
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Old 3/21/17, 01:59 AM   #7
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I m trying to figure wich is the rigt part number for OEM thermostat. I google it but it seems they are more than one! And also they are w/o Rubber Valve and w/ Rubber Valve. Whats the difference ?
I have to order it on line so , anybody have an ideea ?
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Old 3/21/17, 03:09 PM   #8
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If you still have your original "OEM" stat.. There should be a part number stamped on it.. That is the correct part number you want to provide for a replacement.. You can also get the "OEM" part number from any Ford dealership parts dept, local auto parts stores and Ford service/repair manuals as well..

Last edited by m05fastbackGT; 3/21/17 at 05:03 PM.
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Old 3/29/17, 12:13 AM   #9
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Quote:
Originally Posted by SplitSecond View Post
If your car is stock and a driver, go with OEM. The car is designed to operate at a higher temp and efficancy will suffer because it is colder. If you truly wanted the car to run cooler you would also need the PCM programmed to turn on the fans at lower temps as well.
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