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Old 04-25-2011, 08:47 AM   #1  
lehmjr40
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Smile 2009 V6 mustang

Why does the temp gauge go to hot only sometimes and then comes back to the normal? Is it sticking??
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Old 04-25-2011, 08:54 AM   #2  
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welcome....
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Old 04-25-2011, 11:22 AM   #3  
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Welcome to MF! ...could be a thermostat...car over heating?
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Old 04-25-2011, 11:33 AM   #4  
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welcome to MFs... and i say.. delayed electric fans & coolant flow!
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Old 04-25-2011, 01:19 PM   #5  
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welcome to the site.
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Old 04-25-2011, 04:15 PM   #6  
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Just to be sure, check the underside of your oil cap for evidence of water (baby poop/puke yellow color) and your coolant for signs of oil. If either, then you have a head gasket problem. If not, then I'd begin checking out if it's mechanical (thermostat, fan...) or instrumentation (gauge...).

The '09 4.0L is identical to the '05, '06, '07, '08 and '10 4.0L so you have a lot of experience to draw from here.
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Old 04-26-2011, 06:15 AM   #7  
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Sounds like possibly a thermostat if the car isn't overheating!
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Old 04-28-2011, 02:22 PM   #8  
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Had the same problem with my 05.Checked temp with a pyrometer and it was fine ,ended up getting instrument cluster replaced.You do need to check for mechanical issues but do not spend money unless you can diagnose problem.Should still be under warranty.
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Old 05-02-2011, 11:00 AM   #9  
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Thanks everyone.
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