Question about 1999 Pontiac Grand Am GT

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1999 Pontiac Grand Am with "lower intake leak"...What does this mean specifically? Would this mean the intake for the radiator, gasket, or valve?

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Known problem for v6 engine- get it fixed soon could cause major problems if internal leak into crank case, also make sure you get new upadet second design gaskets alsonet to clean & lock tight intake bolts or get new ones so this don't happen again

Posted on Sep 01, 2009

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Your Engine has a upper and lower intakes the 3100(3.1L) and the 3400(3.4L) engines both had lower intake gasket problems.Coolant runs between the 2 heads thru the intake lower portion during the cooling cycling of the engine cooling system which involves your radiator,water pump,hoses,ETC. The black plastic and rubber coated gasket crack after a period of time and need to be replaced.

Posted on Aug 31, 2009

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Usually intake has to do with the induction system, as in intake manifold , The intake manifold can have several types of leaks, the intake can have a vacuum leak, oil leak, coolant leak or a combination of any of the before mentioned....hope this helps,

Posted on Aug 30, 2009

Testimonial: "It is actually coolant leaking, I found out it is the manifold gasket that is leaking"

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Where is the water leaking from in my 1999 grandam?


Check for coolant in the the oil the 99 is notorious for the lower intake gasket going out

Jul 06, 2014 | 1999 Pontiac Grand Am GT

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Coolant leaking on grand am


Can be a cracked radiator, bad hoses leaking at the thermostat or the upper intake or lower intake maybe even a head gasket blown. Your looking at around 400 if u got a leak anywhere other that a radiator or hoses

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2001 Pontiac grand am overheating problem. I have done new head gaskets new intake gaskets, new water pump, new thermostat, new radiator, new reservoir w/ cap. system has no leaks pressurized for 2.5...


Have a cylinder leakage test or co2 test done. my prefered method is a leakage test as it checks heads, head gaskets, valves, rings all in one test.

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Do you have to lift the motor on a Pontiac grand prix 6 cyl. to get to the back freeze plug that is leaking oil?


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Oct 28, 2011 | 2004 Pontiac Grand Prix

1 Answer

Hey guys, i am no mechanic not even close, but my pontiac grand prix se 4-dr automatic with 6cyl, has been acting strange when i first start it and drive it maybe 30 min the low coolent light comes on and...


The first things to do are: 1. Make sure the radiator is full when the engine is cool (check the fluid in the radiator as well as the overflow tank). 2. Make sure the thermostat is working. 3. Have the lower intake manifold gasket checked. The Grand Prix SE came with a 3.1L engine (standard) and these engines are famous for lower intake manifold gasket problems.

Nov 18, 2010 | 1999 Pontiac Grand Prix

2 Answers

I just changed the thermostat on 3.4 L 1999 Pontiac Gr Am GT THINKING IT WOULD FIX THE OVER HEATING. But there is white steam coming out the exhaust! The oil is not milky so it's not a head gasket. There's...


Are you adding coolant?
Yes ......means it's going somewhere.
Fill the coolant tank to the top...right to the top....leave the cap off and run the engine.
If you see bubbles you need a head gasket.
The intake gasket is another source of coolant leaks and at this area the coolant can be sucked into the engine and produce a white smoke.
Does the car run rough at the first start in the morning....could be antifreeze burning off in the cylinder or area that was leaking overnight meaning cyl gasket or intake gasket.
Look at the rear head to block area below the exhaust manifold.
Is there any trace of coolant or stains of coolant......yes means head gasket time.
Pressurizing each cyl at a time with air with the valves closed in that cyl will quickly show the location of the bad head gasket with bubbles coming out of the fill tank on the bad cyl (s).
Head gasket leaks don't always mean milky oil.

Aug 12, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Overheating 97 V6 pontiac grand am


1 Inspect Cooling System Mix Coolant level low or flow is restricted. grey_line.gif 2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). grey_line.gif 3 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. grey_line.gif 4 Inspect Radiator Cap Worn or damaged radiator cap grey_line.gif 5 Inspect Thermostat Thermostat stuck closed grey_line.gif 6 Inspect Fan Blade Broken, missing, or defective fan blade(s). grey_line.gif 8 Inspect Water Pump Damaged, worn or leaking water pump. grey_line.gif 9 Inspect Intake Manifold Plenum - Perform Leaking water pump gasket. grey_line.gif 10 Inspect Cooling Fan Control Faulty cooling fan control or circuit. grey_line.gif 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch or circuit. grey_line.gif 12 Inspect Engine Temperature Sensor Faulty engine temperature sensor or circuit. grey_line.gif 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. grey_line.gif 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. grey_line.gif 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. grey_line.gif 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. grey_line.gif 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders

Dec 01, 2008 | 1997 Pontiac Grand Am

1 Answer

Car gets overheated


Better check to see if the water pump is leaking, or if the radiator hose has a leak or the radiator it self. Also, could be the thermistat sticking. Better get checked if not you'll be replacing the intake gaskets and the head gaskets. If it gets too hot the it could ruin the motor or warp the heads and that is very costly. If the heads get warped it is possible they can be fixed. Hope this helps.

Jul 30, 2008 | 1999 Pontiac Grand Am GT

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