Question about 1999 Pontiac Grand Am GT

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My 1999 pontiac grand am coolant keeps getting low. Although the temp gauge is at half point, the engine always smells as if it is running hot. I've had the radiator hoses replaced, but it is still running low on coolant every couple days.

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This kept happening to my 99 Grand AM and it needed a new thermostat and thermostat housing..

Posted on Sep 27, 2009

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Why is it running hot while sitting in traffic?


It mite not be running hot at all , I replaced a few stepper motors for the temp. gauge inside the instrument cluster . GM products of your year ,have known instrument cluster gauge problems . Best thing is to hook up to a factory scan tool or another type of professional grade scan tool to see what the engine computer is seeing from coolant temp.sensor Do your cooling fans come on ? They should at about 221 degrees . Or you came go to harbor freight an by a temp. inferred gun. point it at the upper radiator hose near the thermostat , an see what the actual temp. is . How to repair GM Instrument Cluster Speedometer Gauge Stepper

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Just had my thermostat replaced, van smells hot, runs at just below temp midrange and the coolant bottle is empty? should I fill it with water or coolant? why is it smelling hot?


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Get hot air from heater


If the blower works and there is no hot air, you may have an issue with your heater core. Does it smell like coolant in the car?

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Is it normal on 94 grand prix 3.1 for the temp. gauge to NOT stay at a steady temp. all the time? mine seems to go up to 210 at a stop light then go back down after i start rollin again, i just had air...


Have you checked your cooling fan to see if it is working propely? Let the car idle and get warm and listen for the fan to kick in (if they are electric) or just watch to see if the fan starts to spin faster if it is the old school type with a clutch. Have you replaced the thermostat? A bad one will let the temp rise since it opens too late and then the temp will drop off. But it won't due this only at a light and it will do it infrequently.

Apr 18, 2013 | 1994 Pontiac Grand Prix

1 Answer

Why would a 2002 Pontiac Montana continuously runs hot after changing water pump, thermostat, and heater cord


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Does the engine feel hot when the gauge is reading hot ?
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1999 grand am low coolant light on but temp on car is not running hot


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Nov 07, 2012 | Pontiac Grand Am Cars & Trucks

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Cooling system problem for Pontiac Grand Am GT 1999, Starts overheating when sitting still but starting the A/C helps cool it.


If it has an electric radiator fan (not AC fan) The radiator fan is not working. Possible coolant sensor or switch.

Apr 02, 2017 | 1999 Pontiac Grand Am GT

2 Answers

My temp gauge goes to the third line before fans come on and only the low fan comes on. I already replaced thermostat, engine coolant temp. sensor and radiator flush... any idea why high fans dont come on...


CHECK COOLANT FAN FUSES AND RELAYS. CHECK COOLANT LEVEL.MAKE SURE ITS NOT TOO LOW BECAUSE IF COOLANT TOO LOW . BY NO COOLANT AROUND OR COOLANT SENSOR NOT SUBMERGED IN COOLANT COOLING FANS WONT TURN ON.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER. CHECK FOR CLAPSE RADIATOR HOSES.CHECK RADIATOR HOSE AT WATER PUMP.IF HOSE LOOK CLAPSE REPLACE IT AND BLEED COOLANT SYSTEM.IF EVERY THING HAS BEEN DONE YOU NEED ENGINE BLOCK FLUSHED OUT.HEATER CORE ALSO COULD BE STOPPED UP.A VERY HIGH MILEAGE ENGINE WILL OVER HEAT.OLD ENGINE LOSES COMPRESSION AND HORSE POWER.PUTTING MORE LOAD ON THE OLD ENGINE WILL MAKE IT OVER HEAT.IF COOLANT LEVEL IS LOW.BLEED COOLANT SYSTEM.START THE ENGINE LET IT IDLE FEW MINUTES WATCH THE COOLANT TEMPERATURE GAUGE.WHEN TEMPERATURE START RISING.TURN OFF THE ENGINE LET IT SET FOR 20 MINUTES.TAKE A LARGE RAG PLACE OVER RADIATOR CAP ON COOLANT EXPANSION TANK SLOWLY OPEN RADIATOR CAP JUST A LITTLE TO RELEASE A LITTLE PRESSURE AT A TIME.DONT OPEN CAP RAPIDLY OR YOU WILL GET SCALDED.ONCE THE RADIATOR CAP REMOVED.IF COOLANT LOW ADD MORE COOLANT IN THE THE COOLANT EXPANSION UNTIL YOU GET TO THE COLD MARK.REPEAT THIS PROCEDURE START ENGINE LET IT RUN UNTIL TEMP GAUGE START CLIMBING A BIT DONT LET CAR RUN TO OVER HEAT JUST IDLE UNTIL TEMP JUST START TO RISE.THEN YOU TURN OFF ENGINE. WAIT 20 MINUTES.THEN USE LARGE RAG OPEN RADIATOR CAP LITTLE AT A TIME. DO THIS PROCEDURE UNTIL THE COOLANT IN THE EXPANSION TANK STOP DROPPING. THEN ALL THE AIR IS BLEED OUT THE COOLANT.WHEN COOLANT LEVEL STOP DROPPING, WHEN YOU DRIVE CAR AROUND.AND TURN OFF ENGINE.WHEN ENGINE OFF CAR SET FOR A WHILE KEEP CHECK ON THE COOLANT LEVEL IN COOLANT EXPANSION TANK. THE COOLANT LEVEL SHOULD BE AT THE COLD MARK IN THE EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK.IF NOT AIR WILL DRAW IN COOLANT SYSTEM. CAUSING ENGINE TO OVER HEAT.IF BLEEDING AIR OUT THE COOLANT SYSTEM DONT HELP AND COOLANT FANS DONT TURN ON YOU HAVE PCM PROBLEMS.

Apr 22, 2011 | 2004 Pontiac Grand Prix

1 Answer

95 Pontiac Grand Prix Temp gauge pegged on hot always


yes. but check every thing else first. coolant level being the most important. then the thermostat.

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1 Answer

Needle in the temp gauge moves up and down


have you been adding coolant ? if the level is low you can experience this problem , or it could be a thermostat thats getting to the end of it's life !

Feb 06, 2009 | 1999 Pontiac Grand Prix

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