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Unread 06-14-2010   #1 (permalink)
travisp11 is offline Made Member


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Default 4.6L Mustang frost/freeze plug location.

Hey guys, Ill try to make this short and sweet. My friend has an anti-freeze leak in his car. Everything is fine up front, we checked all hoses and lines, pumps, etc. Does anyone know where the frost/freeze plugs are located on the engine block of a 4.6L? Also, if these plugs go bad, does the anti-freeze leak from them? We have checked everything we could think of. I believe the GT is a 1996. We just can seem to find where the anti-freeze is coming from but it is running down the main seal between the engine and tranny. We checked the tranny cooler lines and they are fine, too. Thanks guys!!
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Unread 06-14-2010   #2 (permalink)
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i had a frost plug blow out on my 96 and lost all my coolant in seconds. if it is a leak check the manifold valley under the intake manifold see if its wet under there. there is a hose that runs under threre that may be leaking.
good luck
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Unread 06-15-2010   #3 (permalink)
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Default Thanks!

You know what, the top of the engine was the one place we didn't check but when we did, sure enough, there was a small pool of antifreeze on top of the intake manifold. How do we get to that hose? Do we need to remove the throttle body and would you recommend a mechanic for this one? We are o.k. shade tree mechanics but when you start messing with throttle, throttle cables, we would really hate to ruin anything associated in that area. Thanks again!
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Unread 06-16-2010   #4 (permalink)
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you need to remove the intake manifold.
if yours hasnt been upgraded, now is the perfect time to do it.
it really isnt that hard to do. get yourself a Haynes/Chiltons manual and do some searching on the net. its worth saving all the labor costs IMO
good luck
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Unread 06-17-2010   #5 (permalink)
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Make sure it's not the intake manifold itself, the NPI one are prone to cracking on the plastic crossover. When mine went, I couldnt figure out where the fluid was coming from, even at idle it wasn't leaking, but once I revved it up I could see it squirting out.
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Unread 12-31-2012   #6 (permalink)
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mine is leaking from the same area between the engine and transmission.i know my heater core inlet line is bad.im replacing that but it seems like the ammount of watet water coming out would be comming from somewhere else.iv pulled the intake manifold and i dont see any cracks.the top of the engine block is dry as a bone.am i just being paranoid and its just that line or is there somewhere else i should look ? thanks for your help guys
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Unread 12-31-2012   #7 (permalink)
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TRAVIS, did you find where your leak was comming from?
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Unread 03-19-2014   #8 (permalink)
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Default I'm having the same problem with my gt

Quote:
Originally Posted by jb6870 View Post
mine is leaking from the same area between the engine and transmission.i know my heater core inlet line is bad.im replacing that but it seems like the ammount of watet water coming out would be comming from somewhere else.iv pulled the intake manifold and i dont see any cracks.the top of the engine block is dry as a bone.am i just being paranoid and its just that line or is there somewhere else i should look ? thanks for your help guys
Hey I'm having the same prob with my gt pouring out near the tranny did you find out what it was ??
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Unread 04-10-2014   #9 (permalink)
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Default 4.6L Freeze Plug Locations

Quote:
Originally Posted by travisp11 View Post
Hey guys, Ill try to make this short and sweet. My friend has an anti-freeze leak in his car. Everything is fine up front, we checked all hoses and lines, pumps, etc. Does anyone know where the frost/freeze plugs are located on the engine block of a 4.6L? Also, if these plugs go bad, does the anti-freeze leak from them? We have checked everything we could think of. I believe the GT is a 1996. We just can seem to find where the anti-freeze is coming from but it is running down the main seal between the engine and tranny. We checked the tranny cooler lines and they are fine, too. Thanks guys!!

I'm having the same issue with trying to find them. Did you ever figure out where the plugs were located?
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