Question about 1999 Pontiac Grand Am GT

4 Answers

99 GrandAm GT v6 3.4L overheating

My GrandAm GT keeps overheating. I have replaced the thermostat, water pump, coolant temp sensor, recovery cap, done a flush and fan switch relays. I can only get heat thru my vents at 240 degrees. My upper radiator hose gets hot and I pulled the new thermostat, put it in a pan and boiled it til it opened at 190. The 2 lines that run from the top of the recovery tank (I think they are air lines) we took those off and cleaned them out. The one that goes into the thermostat had like a foam material in it so we cleaned that up and the other one had a lot of grime in it. I also bled the air out of the system after I put everything back together. Please someone help, my car is making me go crazy!

Posted by on

  • toriandnick Oct 01, 2009

    fan now come on

  • toriandnick Oct 01, 2009

    oh, and I have 2001 cleaner that I am going to try but I have to tow my car to a friends house to do it cause I live in the city and can't dump my coolant. but I am in the process of removing the radiator and taking it to a radiator shop so he can test it?

×

Ad

4 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

1999 Grand Am Se 2.4L- We Checked The Relays And They Worked. Then We Checked All Fuses And They Were Good. But The Fans Still Dont Come On At 200 Degrees. When We Turn The AC On Both Fans Come On And Stay On After We Turn Off The AC Then When We Shut The Car Off They Dont Come Back On? And The Car Normally Runs At 180? Any Solutions?

Posted on Apr 04, 2010

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Pontiac Master
  • 6,982 Answers

Can't give you a definite "fix" only because I'd need to do testing. But, two items you need to have checked are: 1. have a hydrocarbon test done fro the cooling system to verify that you do or don't have a head gasket problem. 2. have someone check the radiator with a "heat gun" to see if there are any cold spots. Home flush kits and sometimes even shop flush equipment will force cleaner around, not through heavily plugged areas and not clear the obstruction. Heat gun is best way of finding cold areas that are not flowing.
also...you mentioned fan relays...does the fan come on?

Posted on Oct 01, 2009

  • Richard Scordino Oct 01, 2009

    You can do an out of the car flow test but it is less reliable than the in car heat test. I have no info on that cleaner.

×

Ad
  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 4 Answers

Have you checked the fuse for your fan, and made sure your fans are kicking on I had a similar prob and that fixed mine

Posted on Oct 03, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

If you have no heat at 240degrees and you know you have water. then you have air in your lines. these cars have major issues with dex cool older than about two years ago being corrosive when mixed with clorinated water. first thing to go is your manifold gasket then if not careful head gasket or cracked block. Take it to a shop and have them pressurize your engine cylinders with air to tell if anything is wrong. then have them get the air out of your coolant. the radiator sits lower than the maotor or heater core creating air locks in the lines. trust me have read hundreds of stories on line about this and had it happen to me.

Posted on Apr 03, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2000 Pontiac Sunfire GT 2.4L Low coolant light on, even with coolant reservoir full, car is overheating.


I think the first thing I would do is take the thermostat out and run the engine without it.
If the engine stops running hot, try a 180 degree instead of the 195.
As for the low coolant light, can you unplug the sensor and make the light go off ?

Jul 28, 2012 | 2000 Pontiac Sunfire

2 Answers

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

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

Engine keeps overheating


I'd start with replacing thermostat (that's the most common fault) Other possibilities; waterpump,leaky hose, radiator cap (not holding pressure), fan belt broken. I'd inspect for belt & leaks - if good replace thermostat.

Feb 28, 2011 | 1998 Cadillac DeVille

1 Answer

How do i replace the water thmostat 99 6 cylider


WELL YOU NEED TO DRAIN COOLANT LEVEL BELOW THERMOSTAT LEVEL.YOU HAVE TO DISCONNECT MAF SENSOR LOOSEN AIRDUCT 2 LARGE CLAMPS LOOSEN REMOVE 4 SCREWS TO AIR FILTER COVER LIFT UP REMOVE COVER. THEN REMOVE AIR FILTER AND HOUSING, FIRST DISCONNECT MAF SENSOR.YOU HAVE TO DISCONNECT THROTTLE CABLE AND SHIFT CABLE.YOU HAVE TO DISCONNECT REMOVE THROTTLE BODY COOLANT HOSES DISCONNECT IDLE SPEED CONTROL VALVE CONNECTOR AND DISCONNECT TPS SENSOR CONNECTOR. THEN REMOVE THROTTLE BODY ASSEMBLY. YOU NEED TO BUY NEW THROTTLE BODY COOLANT HOSES AND NEW THROTTLE BODY GASKET FOLLOW TOP COOLANT HOSE TO ENGINE BLOCK.NOW YOU SEE CAN AND REMOVE THE THERMOSTAT HOUSING REPLACE THE THERMOSTAT.BESURE TO HAVE EXTRA COOLANT ON HAND.BLEED COOLANT SYSTEM WHEN DONE.TO BLEED COOLANT SYSTEM REMOVE RADIATOR CAP ON OVERFLOW JUG.THEN OPEN BLEED SCREW ON THE WATER PUMP BYPASS HOSE PIPE JUST A LITTLE.POUR COOLANT IN THE OVERFLOW JUG UNTIL LEVEL STOP DROPPING.STOP AT COLD MARK ON JUG.CLOSE BLEEDER SCREW ON WATER PUMP BYPASS HOSE PIPE.CRANK VECHICLE CHECK FOR LEAKS. START UP ENGINE LET IDLE FEW MINUTES THEN CHECK COOLANT LEVEL ADD MORE UNTIL UNTIL LEVEL STOP DROPPING.PUT RADIATOR CAP BACK ON OVERFLOW RESERVOIR. LET ENGINE IDLE WATCH COOLANT TEMPERATURE GAUGE.WHEN GAUGE START CLIMBING. TURN OFF ENGINE WAIT FEW MINUTES TAKE A LARGE RAG OPEN RADIATOR JUST A LITTLE YOU HEAR HISS NOISE.WHEN PRESSURE STABILIZE DONT GET SCALDED BECAREFUL.OPEN CAP LITTLE MORE.IF COOLANT PRESSURE STILL BOILS OUT WAIT 20 MINUTES ADD MORE COOLANT TO RADIATOR OVER FLOW WHEN COOLANT LEVEL STOP DROPPING.PUT RADIATOR CAP BACK ON START VECHICLE UP LET IDLE UNTIL THERMOSTAT OPEN. THEN FEEL TOP RADIATOR HOSE FEELS HOT THERMOSTAT OPEN WATCH TEMPERATURE GAUGE.IF GAUGE TEMP START CLIMBING TURN OFF ENGINE WAIT A WHILE.CHECK AND ADD MORE COOLANT.WHEN THE ENGINE CAN IDLE TEMP GAUGE STOP CLIMBING YOU HAVE BLEED COOLANT SYSTEM.KEEP CHECK ON COOLANT LEVEL.

Dec 29, 2010 | 1999 Oldsmobile Alero

1 Answer

How do i replace the temp sensor, to keep it from over heating?


Replacing the temp sensor will not keep the vehicle from overheating. There is another reason why it is overheating.
Most common problem is a bad thermostat.
Next most common is the water pump.
Another common problem is low coolant.
I would suggest check you coolant first. It is the easiest, and cheapest. Then the thermostat. It is more than likely one of these two.

Oct 19, 2010 | 1998 BMW 7 Series

1 Answer

Son has a 1997 contour with 2.0l overheated


hard to get to and difficult job...are you sure you dont have cracked head? is there water in the oil....does the oil look milky? look in the radiator is there oil residue in the coolant........

Nov 08, 2009 | 1997 Ford Contour

3 Answers

99 GrandAm still overheating after replacing comon problem parts.


did you bleed the air from the system? how do u know u don't have a leaking head gasket, have u had it checked with a gas analyzer?

Sep 29, 2009 | 1999 Pontiac Grand Am GT

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

Not finding what you are looking for?
1999 Pontiac Grand Am GT Logo

1,099 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...