Question about 1999 Pontiac Grand Prix
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
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
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:--
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:----
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
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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