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Old 11-17-2007, 12:28 AM   #1
tahoeman21
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Default Intake manifold leak


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wassup? I am having coolant leaking from underneath the intake. I did some research and concluded that I have to change the gasket. My question is, what is the complexity of changing the intake manifold gasket? thanks

tahoeman for ever!!!:cool2:
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Old 11-17-2007, 12:43 AM   #2
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Are you talking air intake manifold?:skep:
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Old 11-17-2007, 12:55 AM   #3
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You don't say what year or engine, so no specific answers for you. Whatever you have, you need to get some instructions, Chilton's or Haynes manual, or a service manual on DVD or something like that. The job is not rocket science, but there are some things that should be done in sequence and some pitfalls to avoid by knowning the proper procedures.

Good luck.
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Old 11-17-2007, 01:46 AM   #4
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Fore example when reinstalling the manifold if you don't torque it in the proper sequence you will warp it.
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Old 11-17-2007, 10:57 AM   #5
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Whats up tahoeman dude i'm having the same problem now with my 99 tahoe i knew it was leaking but soon as the cold weather hit it must of contracted and now its leaking like my ac drips its bad. i'm going to check mine out within a day or two let me know what you come up with. is your leak coming from the back of the motor?
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Old 11-17-2007, 09:56 PM   #6
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Are you sure it's your manifold gasket? There's a coolant hose that connects to the manifold close to the throttle body on the passenger's side. Water seeping from this will drip from the engine and make you think it's coming from the gasket. Check it out before you tear into it.
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Old 11-18-2007, 01:43 AM   #7
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The 5.7 Vortec engine is notorious for the intake manifold leaking coolant. I had a 97 Chevy pickup with this engine, and it leaked coolant badly. At the suggestion of a mechanic friend of mine, I removed a few of the intake manifold bolts, coated them with RTV, and re-installed them. If I remember correctly, it was the front two on both sides. This worked for a while, but it started leaking again after about 6 months. So far, my 97 Tahoe hasn't had this problem (knock on wood).
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Old 11-18-2007, 02:11 AM   #8
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I hope this isn't a problem with the 07 on up, well I guess that is why I have the 100,000 mile warranty.
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Old 11-18-2007, 03:05 PM   #9
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wassup guys? thanks for the replys.... btw, i have a 5.7 vortec, 2wd... it seems that it leaks from underneath the air intake manifold, the leak comes from the front of the motor. it leaks when it is park on my hill driveway.... the tahoe does not overheat though when i am driving it.... i am constantly adding coolant to the resouvier compartment,, but the radiator is full.... weird. i must fix this leak until it gets worse. I hope as well the new tahoes don't have this flaw as well, because i love them so much!
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Old 11-19-2007, 09:54 AM   #10
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My understanding (non-GM-Technician here..) is that the intake manifold gaskets were each made of 2 materials, a plastic and a metallic. The issue was that they would either seperate, or not expand at the same rate, and it would leak typically as the engine was cold.. as the engine heated up, enough swelling occured to seal off this leak.

Again just my understanding of it as told to me by a few various yukon/tahoe owners... it is not the same block as the new ones.. this problem should be confined to 96-99s.. possibly it was even fixed in 98 or 99.
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