20 Most Recent 1999 Pontiac Grand Am GT - Page 4 Questions & Answers

The water pump is leaking

A strong odor of gasoline is sometimes caused by a failed coolant temperature sensor. If this is your problem the car will be slow to start the first time, turn it off and it will start right up.

Leaking coolant where? What engine does it have? Where does the coolant seem to be coming from? Front of the car, right front (in front of the passenger), left front, middle? Need more information than what you are giving...

Have you checked the high and low pressure switches ?

Yes.

Check normal things test drive for noise in front end usually pretty dependable car check for trany slip

just put in * knock sensor location for a 1999 grand am * in your browser, then hit search. It will pull up a few different images for where the location is. Just inlarge which ever image you need.

Behind the carburetor it's round valve with 1 acumen hose

Gm used the Barrs stop leak right from the factory to seal up new blocks. It was the kind made from walnut shells not the metal sealant. He may have used too much if you are overheating. I would do a good flush and go get the bars stop leak in the tablet form, follow directions and see if that helps. I had a persistent leak from my lower intake manifold, already replaced it once, put some Barrs in and now have zero leakage, no overheating either. I would have re-replaced the manifold's gasket but the car is just a beater. Now this stuff is a bandaid not a repair. So if you push the car hard the leak will reemerge.

Have you ever changed the fuel filter? If it's not that, and it's not a vacuum leak, it is probably your idle air control valve.

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

With a over heating problem the first place you always check is the thermastat.Thermastats ALWAYS go.In fact every two years I change the thermastat wether or not it needs it just to be safe than sorry,I live in a snow belt and nothing worst than having no heat in the winter.Something else you might keep in mind, over heating can do allot of damage most people don't consider, the transmission lines are connected to the radiator which cool the transmission

You need to look at the Caliper pistons to see if they are seized in?

it sounds like you might want to scan your vehicle for sensors evaluation to determine what causing your rough idle if you have engine light on

On the front side of the motor it's 2 4 6 and on the back side it's 1 3 5.