Question about 1999 Pontiac Grand Am GT

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1999 grand am

Engine overheating. Thermostat has been replaced..There is no water in the oil, and I am not sure where the coolant is going.

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  • Anonymous Aug 22, 2008

    Car is overheating, thermostat has been replaced supposeably. I'm getting ready to change out thermostat again. I've also done a radiator flush.

  • stutts824 Sep 03, 2008

    System randomly overheats and the heater blows cold but when I check coolant level it is low. no smoke no water in oil. Thinking it is either a sticking thermostat (going bad and does not open at times)) or bad overflow cap.

  • athena69 Feb 20, 2009

    i have a 99 pontiac grand am gt v6 3.4. i just had the intake gasket replace,thermostat replace, they it started overhearting again, and he came and bled the air out of it and it run fine for 2 weeks and on the 19th the heater started blowing cold air and today it started overheating again.

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'99 Grand Am have a plastic water outlet located on the back of the engine. (Same side as the battery). It is installed using a thin O-ring. Antifreeze is corrosive and weakens the O-ring causing a leak. Because of the location the leak can be almost undetectable. Replace the O-ring, but becareful not to break the water outlet.

Posted on Sep 18, 2008

Does the car run rough when you first start the car

Posted on Sep 11, 2008

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Do you get any white smoke out of the exhaust? if so you have a blown head gasket or your water jackets are leaking the water out.either way youll have to replace the head gasket

Posted on Aug 22, 2008

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1 Answer

My 99 grand am is overheating. I changed the thermostat and it still over heats. what else can cause it to overheat?


How hot does it get in degrees F? Does the radiator fan work? Some fans won't turn on till about 220 degrees F.
Could have blockage in radiator or engine block? Check the water pump. Your serpentine belt ok? Could be gasket issues? Any coolant in the oil or oil in the coolant. Check your coolant temp sensor. Don't replace anything unless your testing points in that direction. Are you losing coolant?

Nov 04, 2016 | 1999 Pontiac Grand Am

2 Answers

Overheating problem


overheating sound like faulty thermostat.thermostat either sticking close or could have blown headgasket if you see a lot of white smoke coming out of exhaust.if headgasket is leaking check engine oil should look milky.also check water pump look around weep hole or see coolant leaking around water pump replace water pump.also check water pump drive belt.make sure drive belt not loose slipping.

Mar 26, 2013 | 1991 Plymouth Sundance

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I have a 1999 oldsmobile intrigue with a 3.5 engine and it is overheating what might be the problem?


It's usually the thermostat, I woud pressure test the cap. It may need to be flushed. Are the fans working? Is there a 50/50 mix of anti-freeze

Sep 11, 2011 | 1999 Oldsmobile Intrigue

2 Answers

My car overheats very easy.i can drive 1 exit on the highway and the temp goes up very fast. i dont know what it could be. there is always fluid in the reserve area and doesnt seem to be getting low or im...


COULD BE THERMOSTAT IF TOP RADIATOR HOSE IS NOT HOT AND BOTTOM RADIATOR HOSE GOING TO WATER PUMP IS HOT THE THERMOSTAT STICKING PARTIALLY CLOSE.IF TOP HOSE IS HOT THE RADIATOR,ENGINE BLOCK HEATER CORE NEED FLUSHING OUT.IF WATER PUMP WEEP HOLE LEAKING REPLACE WATER PUMP, FAULTY WATER PUMP WILL CAUSE ENGINE TO OVER HEAT.REPLACE RADIATOR CAP MAKE SURE YOU HAVE 50 / 50 MIX SOLUTION ANTIFREEZE AND WATER IN COOLANT SYSTEM. IF ALL LOOKS GOOD CHECK ENGINE OIL ON DIP STICK, IF OIL IN DIP STICK LOOK LIKE MILKSHAKE YOU HAVE BLOWED HEAD GASKET THAT WILL CAUSE ENGINE OVERHEATING WHILE DRIVING CAR IN SHORT DISTANCE AND ENGINE OVERHEATING.

Aug 16, 2011 | 1999 Oldsmobile Alero

1 Answer

Overheating


OVERHEATING CAN BE CAUSE BY MANY THINGS LIKE FAULTY THERMOSTAT AND FAULTY RADIATOR PRESSURE CAP,TOO MUCH WATER IN COOLANT SYSTEM NEED 50 / 50 WATER AND ANTIFREEZE.LOOK FOR WATER PUMP WEEP HOLE LEAK, IF COOLANT LEAKING OUT WEEP HOLE WATER PUMP BAD NEED REPLACING.CHECK FOR LOW COOLANT LEVEL, YOUR RADIATOR OVERFLOW JUG SHOULD HAVE COOLANT AT THE FULL COLD MARK IF NOT KEEP ADDING COOLANT INTO COOLANT OVERFLOW JUG UNTIL COOLANT STOP DROPPING AND FULL COLD MARK, IF OVERFLOW COOLANT JUG WAS EMPTY RADIATOR IS LOW ON COOLANT.WHICH CAUSE AIR IN COOLANT SYSTEM KEEPING THE ENGINE COOLANT TEMPERATURE SENSOR FROM BEING SUBMERGE IN HOT COOLANT WHICH TURN ON THE COOLANT FANS.WHEN ENGINE COOLANT TEMPERATURE GET CERTAIN SET TEMPERATURE LIKE 190 DEGREES THE PCM AND COOLANT SENSOR WILL TURN ON COOLANT FANS, IF VECHICLE OVERHEATING COOLANT FANS NOT WORKING EITHER YOU HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR CHECK COOLANT FANS FUSE AND RELAYS. YOU CAN CODE SCAN CAR TO SEE IF YOU HAVE FAULTY PCM, FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FAN RELAY.IF COOLANT FAN AND ENGINE COOLANT TEMPERATURE SENSOR OKAY,YOU HAVE CORRECT COOLANT LEVEL IN COOLANT SYSTEM, THERMOSTAT AND RADIATOR PRESSURE CAP BEEN REPLACED, YOU COULD HAVE BLOWN HEAD GASKET CHECK ENGINE OIL LOOKS LIKE MILK SHAKE HEAD GASKET BLOWED ALSO WHEN HEAD GASKET BLOWED YOU CAN DRIVE CAR SHORT DISTANCE START OVERHEATING AND YOU LOOSE ENGINE POWER SUSPECT BLOWED HEAD GASKET.

Aug 04, 2011 | 1999 Oldsmobile Alero

3 Answers

We just replaced the radiator and the thermastat but the needle still goes to hot


replace the temperature sending unit. Its right there by the thermostat. You can get this at any auto parts store. just need an open end wrench to change it. they do go bad(found out the hard way several years back). I hope this helps you

Jan 13, 2011 | 1999 Plymouth Voyager

1 Answer

My car overheated and leaked coolant everywhere once i shut it off.. i just got my water pump replaced back in april i believe so i'm pretty sure it's not that should i just flush the old coolant out and...


Did you have the thermostat replaced when they did the water pump, as this might be stuck closed and preventing circulation of the water and overheating.....

To check, top the system back up with just water, and run until hot. Switch engine off and feel both radiator hoses, they should be the same temperature, if one is hot and the other cold/lukewarm, the thermostat is stuck closed or partially open.

Oct 01, 2010 | 1999 Jeep Grand Cherokee

2 Answers

Pontiac gp 02 overheating


thermostat should be replace on over heated engine, the spring loses tension, probaly not problem, most like head gasket if over heated severly, if you have a air pocket & wornt purge thats one sign,press test on cold engine let sit at start up run slightly rough may see & smell coolant at tail pipe, could also pull plugs may have one wet all crude checks, there is also chemical you put in coolant & use a a stripe for combustion I think napa or snap on sells, alsoyou could do tear down & inspection wish you luck not sure what engine or car you have grand am or grand prix my guess a GP with poss 3.4 more likely then 3800 engine

Aug 28, 2009 | 2002 Pontiac Grand Am

2 Answers

Engine overheating


The best way to flush it would be to take off the bottom radiator hose and pump water through the fill nozzle after all the coolent is out you can then hook the hose back up and replace it with new coolant.

Feb 01, 2009 | 2000 Pontiac Grand Am GT

2 Answers

Car overheating


you have to change your Heater Core. Your Antifreeze moves in a circular motion from Radiator to Thermostat through engine to your heater core back to your radiator. If there is no circulation, your engine is going to overheat. I had the same problem with my Pontiac Grand Prix.

Nov 22, 2008 | 1999 Pontiac Grand Am GT

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