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Maintenance Service Interval questions, oil change info.

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Old 10-21-2008, 05:18 PM   #16
aceyx
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There are two main areas to watch for leaking coolant.

The first at the bottom of the expansion chamber like Jess described. The second is a hose fitting on the back of the engine that is known to break.

Replacing the latter is a good preventative measure, but the former is somewhat expensive.


If it's troubling you, have the system pressure tested and have them do UV leak detection. If there's a problem with air entering your system, those two tests will find it pretty quickly.
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Old 10-21-2008, 05:43 PM   #17
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The two plastic coolant fittings that are prone to failure are as follows:

"Y" fitting located on back of cylinder head between engine and firewall. This fitting is difficult to access but can be accessred easier by removing the valve cover. If doing so, you may want to purchase a new valve cover gasket and spark plug seals as well. The part is rather cheap, I think around 7 bucks.


And the other fitting located on the block underneath the lower intake manifold. This part requires removal of the upper and lower intake manifold. It's not as common to break, but should still be replaced. IIRC it costs about 15 bucks.


And a link to a great cooling system rebuild thread where those pictures were found, written by CirrusSR22:
http://318ti.org/forum/showthread.php?t=18066
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Old 11-01-2008, 12:08 AM   #18
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I have teh same problem. i change the water pump and thermostat.
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