Question about 1999 Chevrolet Malibu

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My daughter has a 1999 malibu and it keeps overheating and is running a little rough we already changed the intake gaskets any ideas?

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Is the radiator thermostat sticking also check the spark plugs make sure there set right

Posted on Sep 05, 2009

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On a 3500 dulley 4x4 big block chevy gas engine, I have a cylinder 8 misfire and engine light. It also had a mass aire flow indication but that was replaced. only 86000 miles on 03 truck


Check the intake manifold gasket. If it leaks it will draw air into engine and this air bypasses the mass air flow sensor which will cause a rough idle or running symptom from running too lean. If you change the intake manifold gasket you should probably change the valley pan gasket at the same time. A dealer will change both for less than $500 and you might save some more if you dig around on GM Service website and find a coupon discount (Usually 10%-20%). You might save more at a local shop if you trust them and they do this type of work. Getting to the intake manifold gasket also exposes the valley pan and since you are already there it only takes a little more to change that gasket too. Some GM V-8 engines use a little oil between oil changes and if both gaskets are meticulously changed at the same time it will sometimes fix the oil usage. It did for me on my Tahoe (126k miles).

Jun 10, 2014 | 2002 Chevrolet Tahoe

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What are the symptoms of a bad intake gasket on a 1999 buick century?


Coolant leaks,When the intake manifold gasket cracks or blows out, coolant will leak out of the intake manifold. You may see puddles underneath your car or notice smoke or steam coming off of the engine and exhaust from the coolant dripping onto it and then burning.Overheating, If the intake manifold gasket fails and allows coolant to leak out into the engine, your car will begin to overheat. If your car frequently runs low on coolant or begins to overheat, check the intake manifold gasket.Running poorly, When the intake manifold gasket falters, it affects the way the motor handles its emission gases. The change in pressure can affect the vacuum in the intake as well as how smoothly your car runs. Mainly, it will idle roughly and may hesitate, cough or sputter.

Oct 27, 2013 | 1999 Buick Century

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My 99 malibu continues to overheat. We have changed the head gaskets, replaced the theromostat and waterpump and the "air flow sensor"(connected to airfilter housing). Any ideas as to why the...


I would certainly give attention to the radiator.
I am assuming that the engine overheated and the heads warped causing the head gaskets to "blow".

I would consider inveting in a new radiator.

Sep 29, 2011 | 1999 Chevrolet Malibu

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1999 chevy malibu ran hot and would not crank. changed egr valve and not cranks but runs very rough and not sure oil is getting to head.


you overheated it and then it would not turn over?i would check for anti freeze mixing with the oil and then do a compression test on all of the cylinders in case you blew a head gasket

Sep 25, 2011 | 1999 Chevrolet Malibu

2 Answers

1999 Pontiac Bonneville-My fans don't work, lose coolant very fast not sure where it's going? Hasn't overheated, but I don't drive far. Planning to take 1500 mile trip at end of month?, no...


I assume it's the 3.8 V6? They are notorious for intake gasket problems. The fan problem could be a few things, fuse, relay, ECT (electronic coolant temp sensor), ECM, Do the fans come on when you run the A/C? Hope this gives you some ideas. Let me know a little more and I'll try to help. TJ

Aug 06, 2011 | 1999 Pontiac Bonneville

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1998 Chev 1500. 305 T.B.injection. Engine runs a little ruff when first started hot or cold but smooths out perfect after about 10 min of running. Check engine light on.


If you haven't already changed plugs and wires, do that first, but i suspect you have an intake gasket or a head gasket leaking. It runs rough when you start it because of coolant in the cylinder. After it clears out and dries, it will run fine. That would especially be the case if you have to add coolant occasionally.

Aug 15, 2010 | 1999 Chevrolet Silverado 1500

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Had a problem with the heater working then not on my 1999 malibu. Then this week the car overheated. Any ideas on the problem?


start affordable way first change your thermostat and make sure the fan in the motor is turning on when runing,worse case your head gasket blew and the only way to see is if its mixing oil and antifreeze and your car is spewing white smoke out your tail pipe if you want to know if its ur head gasket you would have to do compression test to look for leakage

Feb 05, 2010 | 1999 Chevrolet Malibu

2 Answers

Why am i overheating


Most likely have a bad intake gasket, or clogged radiator. make sure your fans are coming on also.

Jul 23, 2009 | 1999 Chevrolet Malibu

2 Answers

1999 Olds Alero leaking coolant and running rough


in my experience it sounds like a head gasket problem it maybe leaking into the cylinders or could be a small leak from one of the hoses I would do a compression test just to make sure and then pressurize the entire system using radiator and coolant tester if pressure holds then its not a leak as far as the fans go just have the car running when it reaches the middle of the temp gauge it should come one if not you may need to run check on temp sensor or fan switch and fans them selves I would follow repair manual troubleshooting section on heating and cooling haynes or chiltons will do.

Jan 31, 2009 | 1999 Oldsmobile Alero

1 Answer

Gasket is blown, water in my oil.


As long as the heads are not damaged from overheating repairing would be an option rather than replacing the engine. Get advise from a mechanic you trust. The intake manifold gaskets are the most common problem with this vehicle if you have the V6 engine.

Jan 30, 2009 | 1999 Chevrolet Malibu

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