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3800 engine getting antifreeze in it and leaking should there be or not?

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More info on what vehicle your 3800 is in would help, but these engines are notorious for getting cracked intake manifolds. The EGR gasses pass thru the intake very close to the water passages around the throttle body. The hot gases will cause a crack and then water will get sucked into the intake.

Posted on Apr 21, 2013

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2 Answers

Diagram 3800 engine


There is 2 hoses that go onto tubes on the bracket, also check to see if the elbow below the bracket is not broke, It goes from that bracket into the lower intake manifold

Aug 08, 2014 | 1999 Pontiac Grand Prix

1 Answer

Car knocks when I start it


If it has the 3800 engine, usually the issue with this engine is at some time, the upper intake manifold (plenum) developed an internal coolant leak, from the plastic housing just under the throttle body, from the EGR tube that flows in to upper plenum. This causes the coolant to seep into the lower intake manifold ports and into the engine cylinder, on top of the piston, and when the engine turns over, sometimes this coolant causes this concern. If at any time you started your engine, and it stopped turning (cranking) over for a split second and then cranked over to start, this could cause the connecting rod to bend slightly causing the internal engine knock. Was your coolant/antifreeze ever low?? Is your engine oil have a milky color?

Nov 04, 2013 | 2001 Pontiac Bonneville

1 Answer

Pontiac Vibe no cabin heat


The replacement thermostat may have failed.

Sep 13, 2012 | 2006 Pontiac Vibe

1 Answer

I have a 2005 impala it blows cold air only.the thermostate is set at the hottest setting.i dont think its the heater core because it does not overheat and its not leaking antifreeze.what could it be?


It's more than likely the thermostat. If you have a 3800 V6 this is a very quick and easy fix. It you have a 3400 engine, this can be a pretty frustrating job. The bolts that hold the thermostat housing on are very difficult to get at on a 3400 engine. Either way, the thermostat itself is only $10-$12.

If your thermostat is stuck open the engine coolant will constantly circulate and won't warm up to normal operating temperature. Since it isn't warming up, you won't have any heat inside either.

Nov 06, 2010 | 2005 Chevrolet Impala

1 Answer

1998 Buick LeSabre 3800 V6. Coolant is leaking fro an "L" shaped hose that leads from the engine block to other heater hoses. Is this a major repair or can i do it myself?


My guess is you can fix it yourself if you posses rudimentary repair skills. Dump the radiator. Remove the hose, Take to parts store. Try to describe to them. Take a picture beforehand, just in case. Replace hose, refill radiator. Start engine, put heater on high, top off radiator again, close radiator, check for leaks, that's it. If you are really cautious then you will fill with all water first, check for leaks, dump and refill with proper antifreeze/water mix.

Mar 04, 2010 | 1998 Buick LeSabre

1 Answer

When I get into the car after warming (10 mins) it smells like gas. There is a small puddle on left front of the intake, and also on the right. The center one is dry. Also the area under the throttle body...


Sounds like your plastic intake manifold is leaking. This is a common problem on 3800 GM engines. They warp, leak and can ruin your engine. I'd advise to have it towed to a REPUTABLE car repair shop AFTER you call around for some estimates. It ain't cheap to have it fixed and is more of a job than the average do-it-yoourself mechanic can do.
Good Luck...

Dec 06, 2009 | 1997 Buick LeSabre

1 Answer

Need to drain coolant from 1998 Olds Intrigue. What is best way? (3800 Engine)


COOLANT CHANGEON THE RADIATOR (LOWER DRIVERS SIDE FACING THE MOTOR) THERE IS A PLASTIC LIKE PLUG THAT YOU TURN COUNTER CLOCKWISE ABOUT 3/4 OF A TURN, THEN YOU CAN PULL IT OUT ABOUT 1/2 AN INCH THIS WILL DRAIN THE RADIATOR, THEN YOU CAN PUSH THE PLUG BACK IN AND TURN IT UNTIL YOU FEEL IT LOCK BACK IN PLACE. REFILL RADIATOR WITH 3 PARTS COOLANT TO 1 PART WATER.
1998-'99 Intrigues equipped with the 3800 engine have a specific process for replacing antifreeze. It is somewhat of a lengthy process and you should refer to your owners manual for doing this. After you empty and flush your system with water (garden hose), only fill the system with green 50/50 antifreeze, NOT Dex-Cool. Avoid Dex-Cool. If you bring your Intrigue to a shop to get serviced, make sure and inform whoever doing repairs and/or leave a note (clearly visible) to NOT use Dex-Cool if they're doing any work pertaining to cooling system.

Nov 08, 2009 | 1998 Oldsmobile Intrigue

1 Answer

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!

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

1 Answer

1990 Buick 3800 Oil in the antifreeze


there are oil galleries in the had so that the valves and cam can get some lubricant so it maybe that in one of those oil galleries has a crack and same with the head gasket so it could be either one

Aug 22, 2008 | 1990 Buick Regal

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