Question about 1995 GMC Yukon

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Ihave a small coolant leak looks like intake manifold just under valve cover how do i fix this

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The intake manifold gasket needs to be replaced it sounds like to me.

Posted on Oct 10, 2009

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Most likely the intake manifold gasket will need replacement. but find out exactly where the leak is first.

Posted on Oct 10, 2009

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1 Answer

Hello, i have a coolant leak i thought it was the water pump but the leak is above the mount bolt of the water pump beside the valve cover no coolant has gone in the valve interior, could it be a cracked...


A crack in that area of the block, while possible, is highly unlikely. A crack in the block usually happens in between the cylinder walls on the side of the block. It is most likely leaking from the intake manifold gasket that connects the intake manifold to the heads, or if the upper radiator hose connects to the intake manifold, it could be leaking from the thermostat housing or hose. There are also coolant temperature sensors that are mounted in that area. Or last but not least, it could be leaking from one of the freeze plugs in the end of the head. Coolant runs through the block, heads and intake manifold.

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Coolant leak at intake 1994 Buick LeSabre 3.8 ltr


There are several areas of possible leakage. One is the hose and plastic outlet from the intake manifold on the passenger side of the engine. The hose runs low, underneath the alternator. The plastic outlet cracks, the hose gets old, the clamps on the hose can also be loose. The replacement outlet from the dealer is steel, not plastic.
Another possibility for leakage is on the driver's side of the intake manifold. Underneath the air inlet is a metal cover on the end of the intake manifold. This covers the coolant passages at the end of the intake. Mine was oozing antifreeze..you don't have to pull the intake to replace this.
The other place for leaks is the intake itself..requiring removal of the intake. I've done this...I don't think it is that bad of a job. However, if you put in a new intake, don't forget to put in a pcv valve..it fits under a small cover at the right rear of the intake manifold.

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My 2000 Olds Silhouette leaks coolant.


First is to check to see if it's your intake gasket, pull the dip stick and look at the condition of the oil. Look for excessive sludge and milking, look under the oil cap and look in to the valve cover, also pull the PVC valve and look at the condition. Check to see if there is sludge and milking, if there is then you have antifreeze leaking in to you engine crank case which is very bad. The antifreeze is corrosive to the engine bearing and will soon cost you a new engine if there is no indication of antifreeze in your crank case, then it's a leak somewhere else through out your cooling system. If you see the leak from the out side then that's good, it may just be a bad hose clamp that needs to be tightened. If your not sure and want to buy some time, add about 3 table spoon of common kitchen Black Pepper. The black pepper will work it's way throughout the cooling system and will plug up the leak for now and the great thing about pepper is that it will not leave any residue when you flush out the system, not like the radiator stop leaks out in the market. Good luck and keep me posted, it could be the heater hose to the heater core.

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I have a 1998 Buick Lesabre that keeps losing antifreeze.


Buick 3.8's are notorious for intake manifold leaks. If you are sure you are not leaking externally (look under the alternator and on the top of the transmission), it could be an intake manifold leak. I've replaced mine...I didn't think it was too hard a job for an amateur.
It could also be a head gasket, but the intake leaks are much more common.

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If it is not necessary to replace the coolant tube in the intake manifold if it is leaking antifreeze, how do you fix the leak even if you do flush out the system and put green antifreeze in? I am also...


I'm assuming you are talking about the 3800 v6 engine?
I don't know what hose or tube you are talking about either. There is not any coolant going through a hose in the intake manifold. There are two bypass coolant elbos on the passenger side of the engine going into the intake and timing cover from the intake and the heater core. Is this what you are talking about.
And NO green coolant in a 97 Dexcool only!

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I have a 1999 jimmy with 115,000 miles and I,m hearing about the intake manifolds leaking antifreeze what concerns should i have with my jimmy and what type of antifreeze should I be using


A leaking manifold could cost you a VERY expensive repair. I recommend getting it fixed as soon as you can. And with the antifreeze...seeing how it it a GM it should take DEX-COOL. But look under the hood and look for a white sticker and it should say "This vehicle takes DEX-COOL coolant. Do not mix with any other coolant" and if not the cap for the coolant should say so. If so, then obviously you need DEX-COOL or universal coolant. Universal will not harm anything, but I would use the manufacters reccommendations just on the safe side.

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may be oil leaking and burning on manifold,could be small coolant leak but u would smell the coolant check valve covers maybe leakin,intake,breathers?????

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just replace the intake gasket not the whole intake manifold

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Vacuum leak


mine is doing the same, it's your pcv receptor on the manifold. that hard plastic cover is actually part of the intake itself, if it "came off" it would cut your intake in half. that seem seals the two halfs together. you gotta pull the whole intake off and replace it... or jimmy rig it.

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