V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

96 3.8L 6 overheating & most everything changed

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Old 12-27-2010, 08:45 PM
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96Purpleboy
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Unhappy 96 3.8L 6 overheating & most everything changed

Question, for the last 10 months my stang has been overheating. First I replaced the thermostat, then then the radiator, hoses (top/bottom), fuses, it's been cleared of air bubbles 4 times (after each repair) and now it's leaking anti-freeze and overheating according to the gauge but the radiator cap isn't hot. I'm replacing the cap tonight and wondering if the heater core needs to be next. It has 138k miles and other than the overheating runs good. Any thoughts?
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Old 12-27-2010, 09:01 PM
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NeoTokyo
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Where is it leaking coolant at?

Have you changed your water pump yet?

Before you change your heater core you can try to bypass it to see if that helps, if it doesnt help then your problem isnt there.

You might want to have a leakdown test done to make sure you dont have a bad head gasket.

Here is some good reading material for you; note the paragraph on "Gasket Problems."
http://en.wikipedia.org/wiki/Head_gasket
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Old 12-27-2010, 09:34 PM
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petrock
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I'm guessing a bad water pump, blown head gasket, or bad radiator cap. Either the coolant isn't flowing, or the fluid leak isn't allowing the system to get up to pressure so its boiling too quickly.
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Old 12-27-2010, 10:32 PM
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96Purpleboy
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Default Overheating 96 Mustang

I did forget to mention the water pump is new too but I will try the other suggestions. The leak appears to be on the right side (by the radiator cap) but there hasn't been any anti-freeze by the cap itself, it starts about an inch below it and down what looks like the seem of the radiator.
Thanks for the input.
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Old 12-27-2010, 11:03 PM
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mustangted
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head gasket
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Old 12-27-2010, 11:03 PM
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. .
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Old 12-27-2010, 11:03 PM
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head gasket ..

Last edited by mustangted; 12-29-2010 at 10:41 AM. Reason: opps didnt realize it posted 3 times
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Old 12-27-2010, 11:04 PM
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petrock
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Originally Posted by 96Purpleboy
I did forget to mention the water pump is new too but I will try the other suggestions. The leak appears to be on the right side (by the radiator cap) but there hasn't been any anti-freeze by the cap itself, it starts about an inch below it and down what looks like the seem of the radiator.
Thanks for the input.
The leak would explain the overheating. The cooling system keeps the coolant under pressure which increases its boiling point. Without that pressure the boiling point is lower then the temp the motor gets to. So you overheat. Fixing the leak should fix the overheating. Good luck...

Last edited by petrock; 12-27-2010 at 11:06 PM.
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Old 12-27-2010, 11:04 PM
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blown head gasket

Last edited by mustangted; 12-29-2010 at 10:41 AM. Reason: opps didnt realize it posted 3 times
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Old 12-28-2010, 02:03 AM
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NeoTokyo
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Originally Posted by mustangted
blown head gasket



║ Post *****


Sounds like the plastic side cap on the radiator may have cracked or is separating.
Change that out, a leaky rad is never good.

If you go with a mishimoto radiator be sure to get their rubber isolator bushing kit with it otherwise the flexing from the front end will stress and crack the radiator.

A lot of people hate Mishimoto for the cracking problems they have had but these issues were fixed once they offered the softer rubber isolators.

Last edited by NeoTokyo; 12-28-2010 at 02:12 AM.
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