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Losing antifreeze from intake manifold pours it all out

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Replace the intake manifold gaskets and check the manifold for damage, if damaged replace the manifold

Posted on May 18, 2009

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Thermostat


Are you losing coolant? Low coolant will cause fluctuations and overheating as air gets trapped in the system. There was a class problem with this vehicle with regard to the lower intake manifold gasket breaking down under the use of Dexcool antifreeze. Many vehicles developed external leaks as a result, but some leaked into the cylinders and the problem is less noticeable. If you are losing coolant and can't see or smell it, have the engine checked for the intake manifold gasket.

Dec 15, 2011 | 2002 Chevrolet Impala

1 Answer

Losing antifreeze changed thermostat and resivoir cap


Check you oil for signs of coolant contamination. If coolant is present in the oil, you may have a leaking head gasket or intake manifold gasket. If there is no sign of coolant in the oil, the antifreeze could be leaking past the intake gaskets and into the combustion chamber. It could also be a leak that only shows up when the engine is running, and you are losing the coolant as you drive. This kind of leak is very difficult to locate. You will have to look for signs of antifreeze around the upper and lower intake gasket area with a strong flashlight. Also check for signs of leakage at the upper and lower radiator hose connections and the drain valve at the bottom of the radiator. If you smell antifreeze inside the car, check the carpet for dampness caused by a heater core leak. Sounds like a lot of work, but these mystery leaks as I like to call them, can take repeated inspections before you finally locate them. I hope I have been of some help. Good luck and let me know what you find.

Feb 22, 2011 | 2002 Oldsmobile Intrigue

1 Answer

Just pulled the intake manifold on my BBC and found antifreeze in all of the closed intake valves, what caused that??


Not sure what engine you are speaking of, (other than BBC) but if you did not drain your cooling system before removing the intake manifold, any coolant in the manifold distribution channels would pour out through the easiest path once the gasket seal was broken.

Jan 02, 2011 | 1998 Pontiac Grand Prix

2 Answers

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.

Nov 05, 2009 | 1989 Buick LeSabre

1 Answer

My haynes manual mentions pressure testing my cooling system to check for a leak. However, it doesn't mention how much pressure to apply to the system or what reading I should be looking for. Any Help? My...


are you losing antifreeze and not sure where its going?? if this car is a non supercharged 3.8 it will most likely be the upper intake manifold leaking antifreeze into the egr passage,this in turn will put antifreeze into the cylinders and act just like a head gasket problem,its a very common problem with these engines.what happens is near the throttle body in the intake itself there is a coolant tube and an egr tube next to each other and after a while the plastic intake starts to break down from the antifreeze and it starts dumping antifreeze in to the egr tube,this is caused by the dexcool antifreeze (the orange stufff) i suggest flushing the system and putting green antifreeze in it,but do not mix the two-if mixed it will gel up and cause problems,hope this helps

Oct 23, 2009 | 1997 Pontiac Grand Prix

1 Answer

Antifreeze leak


DO NOT DRIVE THE CAR until this problem is fixed! You could destroy the engine.

Many GM V6 engines of 1995-1999 had defective Upper Intake Manifold (UIM) gaskets (this is especially true for 3800 V6 engines). The antifreeze/coolant (especially orange DEX-Cool) will deteriorate the gasket material over time. If there are abnormal exhaust noises accompanying the leak, and/or the oil appears cloudy (check this immediately), you may have a blown head gasket or Lower Intake Manifold (LIM) gasket. Start with the UIM gasket.

The repair is detailed in the Haynes manual for that car ($17 at NAPA and Carquest), and (DIY) will take 5-8 hours plus a new gasket and RTV sealant (parts should be under $40 for all). A shop will charge $250-350 for this job.

Oct 08, 2008 | 1995 Pontiac Grand Am

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