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Hello all, first time poster, I have a 2007 equinox with roughly 200K miles. Started having a coolant loss issue, replaced intake, loss still present. Moved on to head gaskets, heads tested out fine and machined reinstalled everything and still have coolant loss. Its been 2 weeks since getting it back and the coolant loss seems to be speeding up. NO visible leaks or puddles. Getting milking in the valve cover but not in the crankcase. Any advice or direction would be much appreciated. Thanks!
 

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To me, it still sounds like either a head gasket or intake manifold issue.
 

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hoot73:

First of all, congratulations on making it to (or about to reach) 200,000 miles. As for the coolant loss issue, I had a similar problem with my '02 Impala. It was the Lower Intake gaskets leaking, and I *think* the leaking started very insidiously at around 75,000 miles. At 104,000, I finally got around to replacing the gaskets. Now, with almost 205,000 miles on the vehicle, it's starting to lose coolant again. This time, I'll probably replace *both* the head and lower intake gaskets.

More than likely, this is your problem. When you replaced the intake, what gasket set did you use for the replacement? I used the metal-backed Felpros. When I did my replacement, GM had already issued "re-designed" intake gaskets, but when I went to look at them at the dealer, I wasn't impressed: looked like the same thing to me! Just couldn't feel good about putting those in there.

You know - you might want to first verify those LIM bolts are torqued down properly. On my engine, they're really l-o-n-g and narrow bolts installed with very low torque. Maybe they're not installed properly. Also, unlike the head bolts, I don't recall them being "torque-to-yield" bolts, so I re-used mine, but maybe you might want to try installing new bolts while you check the torque on them? And double-check that valley seal connecting the two sides. Maybe not enough sealant there?
 

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I just had the weirdest revelation and hopefully, it can help you.... And I know exactly how frustrating it is. There is a design flaw that most do not catch. First thing you might want to do to check if this is happening is lift the vehicle up and check for signs of coolant on the rear, left corner of the oil pan and other components nearby. What I'm about to tell you is going to sound funny: The engine is not leaking. Believe it or not, there is a 3 way plastic coolant junction directly above this side of the engine that connects from engine to heater core, and, to the coolant reservoir. Look for signs of leakage at this junction. Most likely, due to it being plastic, it's cracked. One of the weirdest signs is after running the engine, if you open the hood, you'll hear coolant drip once on that side of the engine and onto the exhaust manifold. You won't be able to tell right away where it's coming from unless you look under the vehicle first.


I hope this helps,


Starflare5.
 
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