Question about 1999 Pontiac Grand Prix

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99 Grand Prix 3.8 Temp Gauge

Hi, My Car was linking coolant but the temp gauge in the car always stayed at 210 or little lower, so the mechanics tooks out the lower and upper intake Manifolds and they were fine, they replaced the gaskets and clean and sealed the valve colvers, then the gauge started to go up to coolant indicator icon or close to red, so they replaced the thermasat, coolant temp sensor and radiator and they bleeded the system. but the temp still stays aroudn the the coolant indicator. they then hooked up thier system meter and it showed that the engine tempe was running normal but the gauge was showing higher then the temp actually was. any help on this would be awesome

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Posted on Jan 02, 2017

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SOURCE: 1992grand prix red light comes on for a little

these cars were famous for the low coolant sensor failing. if the level and temp is ok, and the light is still on, replace the coolant level sensor. i think it is located on the passenger side of the rad, about 6 inches down on the tank.

Posted on Nov 29, 2009

  • 5370 Answers

SOURCE: 2008 grand prix gxp. there

The fan are controlled by the engine computer based on input from the coolant temperature sensor. unplug the Coolant temperature sensor and see,if the other fan comes on.There are three wires from the Engine Coolant Temperature sensor or CTS for short (Coolant Temperature Sensor). One wire gives the temperature signal to your dash temp gauge, one gives a temperature signal to the PCM, and the other provides a low reference signal to the PCM and provides the signal to turn on the fans.If the CTS wire is short then it will not signal both or any one fan to come ON.---------- To check Coolant Temperature sensor wiring.Click this link below:-- http://i266.photobucket.com/albums/ii259/SyntheticShield/Grand%20Prix%20Diagrams/Electrical%20Diagrams/Coolant_Temp_Sensor_Connector.gif ----------- Also you check the fan connections and wiring too,this will help to locate the exact short in wiring:--- To get the exact wiring.Please click on the link below:---- http://i266.photobucket.com/albums/ii259/SyntheticShield/Grand%20Prix%20Diagrams/Electrical%20Diagrams/Cooling_System_Schematic.gif
You can see in the last diagram that the fan relays go directly to the PCM to get the ground (or low reference) signal in order to engage and that comes directly from the CTS.You can see in the last diagram that the fan relays go directly to the PCM to get the ground (or low reference) signal in order to engage and that comes directly from the CTS.You can see in the last diagram that the fan relays go directly to the PCM to get the ground (or low reference) signal in order to engage and that comes directly from the CTS.
You can see in the diagram that the fan relays go directly to the PCM to get the ground (or low reference) signal in order to engage and that comes directly from the CTS. ----------- This should help.Thanks.Helpmech.

Posted on Feb 04, 2011

  • 14036 Answers

SOURCE: 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 ai

temperature should stay mid range on temperature gauge.if car comes to a stop temperature should not jump high in 5 to 10 minutes.if so coolant too low or have too much water not enough coolant to raise boiling point make sure you have 50/50 water and coolant mixture.have coolant sytem flushed could have restricted radiator or heater core and engine block could be restricted. water pump could be failing.your coolant fan should be running when engine temperature rises to 190 degrees if not engine coolant temperature sensor faulty or could have bad fan relay blowed fuse.make sure see if coolant fan running when engine getting hot.replace thermostat and radiator pressure cap also see what happens.

Posted on Apr 18, 2013

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1 Answer

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the temp gauge works of a different sender to the coolant sensor. IT has 1 wire only and changes resistance as the water heats up there by moving the needle on the gauge up the scale Check that the wire is tight on the sender unit and if so then replace the sender unit.. The difficulty in re starting the motor may be because it is over heating but you would not know this because of the faulty sender unit.

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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.

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I have a 2005 Pontiac Grand Prix. the other day my check engine light came on. I took it to O REILEYS this afternoon and hooked up the computer to the car and what came up was something like COOLANT...


IF CAR TEMP GAUGE IS GOING ABOVE 200 DEGREES, CHANGE THEMOSTAT IMMEDIATELY BEFORE YOU DO DAMAGE TO THE ENGINE. IF THE TEMP STAYS AT 195 DEGREES, THE THERMOSTAT IS STUCK OPEN AND THE ENGINE WILL TAKE LONGER TO WARM UP. IT IS AN EASY FIX IF YOU ARE MECHANICALLY INCLINED. BUY NEW THEMOSTAT- ABOUT 10 -15 DOLLARS - AND CHANGE. HAD THE SAME PROBLEM WITH MY 04 GRAND PRIX.

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1 Answer

I noticed my engine light on the dash of my 2004 Grand Prix was on so checked code with tester. Said coolant temp below thermostat temp. Replaced thermostat drove car for 30 minutes. Popped hood fixed top...


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Jan 20, 2011 | 2004 Pontiac Grand Prix

1 Answer

My check engine light is on, and today my temperature gauge stopped working and we have replaced the engine coolant sensor and the connector and temperature gauge still not working. PLEASE HELP


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Coolant was okay, so took it to my mechanic. His netbook sized computer showed it was the Thermostat. He reset the codes and the temp guage went back to normal. Was short on $40 for the fix at the time, so I parked the car and promised to bring it back in 3 days. Went out and checked the car a day later at 25 degrees outside without starting the car... gauge still sitting at the normal level. No question it's the thermostat. That car will not be driven again until T.stat is fixed in 2 days.

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Feb 06, 2009 | 1999 Pontiac Grand Prix

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