[vereshchak]

I have a 2000 Mustang GT and Im losing a lot of coolant. I recently changed my thermostat so I opened it up to make sure everything is clean and sealed properly. After trying this twice it is still leaking! Its not leaking on the ground but there is a big pool on the block under my alternator. I dont see any visible cracks but my sight is very obstructed. It doesnt always leak but mainly when my cooling system is under a lot of pressure. Regular driving while my thermostat is open isnt bad, but harder driving makes a complete mess of coolant. Im thinking my intake manifold gasket? Please help!

 

[fordman777]

Is your intake all plastic? Meaning you don't have the updated PI intake with the alluminum cross over. If it is all plastic then look at the thermostat housing really good again and make sure it doesn't have a crack in it.

Look at this link it is the newer PI intake and what you will need if you have to replace it.

Ford Racing 4.6L Performance Improvement (PI) Mustang Intake Manifold M-9424-P46 - Free Shipping!

 

[SoCal2V]

Agree with the above, likely the manifold is cracked at or nearby the thermostat housing. Fire it up, drive around the block or wait for the engine to get up to 'normal' operating temp and then pop the hood and start looking - shouldn't be too hard to find where it's coming from.

 

[southern stang]

Ford lost a class action lawsuit for this problem in early 2000. Happened to my 99 gt. ford replaced manifold for free. Before buYing a new one check with dealer and mention the class action lawsuit that they lost.

 

[vereshchak]

Ford lost a class action lawsuit for this problem in early 2000. Happened to my 99 gt. ford replaced manifold for free. Before buYing a new one check with dealer and mention the class action lawsuit that they lost.

And they should replace it free??

 

[SoCal2V]

Pretty sure the claim period for that is long expired.

 

[vereshchak]

Well im definitely feeling a nice crack under the first coolant cross over... thisll be fun

 

[Hood Time]

Your glass is half full my friend. Take the opportunity to upgrade. :bigthumbsup

 

[fordman777]

Do not do nothing more than the stock PI intake. It will be a waste of money. Unless you have a setup that is not stock and would benefit from the intake that loves the higher RPM's and also reving higher than your factory rev limiter is set at. The PI intake is a very good intake and shouldn't be upgraded unless it would be beneficial.

I'm not going to say that you wouldn't gain anything but I would bet that you would lose some power somewhere also. The few HP you would gain is not worth the money.

 

[Hood Time]

Unless he wants to put a KB blower on. :naughty

 

[fordman777]

If that is in his budget. They make good power but ain't cheap.

 

[SoCal2V]

You really still need cams (and heads, honestly) to make the purchase of an aftermarket manifold worthwhile. Great, it makes good power at 6500 rpm - doesn't mean crap if your cams and headflow limitations choke off power at 5600, and yes Fordman from what I've seen there isn't one aftermarket manifold yet that doesn't lose at least a little power vs. a PI manifold below 5000 rpms (on an otherwise stock engine, just to clarify).

 

[fordman777]

Thanks SoCal!

Damn 15 word min limit ********

 

[danieljag1]

I had to replace my intake with a PI a while back. There wasn't any coolant around my block, but it was getting into my spark plug holes somehow and causing misfires. It was my first "big" job on my Mustang. It wasn't hard, but it just took me a while. I hear of people doing it in a day, even a few hours. It took me three days. Still, it was an easy job and gave me a lot of opportunities to clean some different parts along with some hard to reach places.


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