Question about 2004 Lincoln LS

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Temperature gauge climbs to high, overheat temp indicator illuminates and audible alarm signals displaying temperature high on my 2004 Lincoln LS, this car exhibited the same problem about 3 weeks ago, the mechanic replaced the thermostat which seemingly corrected the problem, until it started again yesterday, when you shut the car off and restart it after a short period of time the gauge stays in the middle for about 2 miles of driving, then will start climbing again quickly, what could be the cause of this?

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Hi as the thermostat has been changed it would rule out that being the fault, but you need to check that when the coolant was filled up that it was done correctly as you can get an air lock and this will cause it to over heat.

when you fill the coolant up you need to make sure any air bleed screws are undone if you have them then when you fill the coolant up you need to make sure its just trickled in to prevent air lock, then when its up to its proper level you need to start the engine and let it get to normal running temp with the coolant filler cap off then when its up to temp put the cap back on then see if it over heats.

if after doing the above it still over heats then you may have one of two problems you could have a faulty water pump or worse case head gasket failure.

make sure the coolant was filled up correctly then i would get a gasses test dont on the coolant this can be done at most garages for a small fee getting this done will tell you if the head gasket has gone or not. if its still over heating its not worth doing any work until you have checked the head gasket as you could throw new parts on just to find out the head gasket has gone.

let me know how you get on or if you need further assistance ok

plz rate this solution as i have a whole page of unrated posts, thanks

Posted on Aug 27, 2010

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Temp guage not working 1999 alero


One advantage us dealer tech's have over a week end warrior is that we have factory service repair information and have factory scan tool ,Tech 2 , to check data coming into the instrument cluster . Most of you probably don't even think about how that coolant temp infor shows up on the gauge , except by a coolant sensor !

High Temperature Indicator
The high temperature Indicator function handles the control of the Engine Temperature Gauge Display and the red High Temperature indicator. The Powertrain Control Module (PCM) reads the Coolant Temperature Sensor, filters the messages, and sends the coolant temperature to the instrument cluster via a Class 2 serial data message. The PCM monitors the coolant sensor in order to determine a fault. The PCM transmits the Class 2 serial data coolant temperature report messages to the instrument cluster for the temperature gauge display and for the high temperature indicator control.
The instrument cluster receives the engine temperature data in the Class 2 serial data message from the PCM. The instrument cluster converts this data into a temperature gauge pointer position which drives the gauge pointer. The instrument cluster also uses this data in order to determine the high temperature indicator control.
The Body Control Module (BCM) looks for the high temperature indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is ON.

Your best bet , take it to a qualified repair shop , rather then just replacing parts .

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The gauge in the instrument cluster could be going bad ! maybe. Is that what your going by ? You need to have it hooked up to a scan tool ,not a code reader . It will tell what the ECT - engine coolant temperature sensor is reporting to the PCM - engine computer .The PCM turns on the cooling fans when the temp. reaches 262 degrees ! Are the cooling fans coming on ? Thermostat sticking ! Go to harbor freight an buy a Laser Temp Gun Infrared Thermometer , $30.00 . point it at the upper radiator hose an see what the actual temp is !
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The instrument panel cluster (IPC) illuminates the TEMP indicator when the powertrain control module (PCM) determines that the coolant temperature is more than 128?°C (262?°F). The IPC receives a discrete input from the PCM requesting illumination.

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Is the cooling system full of coolant ?
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?€¢
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?€¢
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I think first of all you need to verify that it is really overheating and isn't a sensor that has become faulty and is sending false information to the management computer that these days will drive the cooling fan, the temp gauge and any alarms.
An obd scanner should show a similar coolant temp and air temp when the engine is cold and then register a fairly smooth increase after starting until it drops when the thermostat opens and begins to climb again until working temperature is reached and the cooling fan begins to cycle (if electric).

A failure to register and then suddenly jump could be a faulty sensor but could also be indicative of a blocked degassing system or an excessive amount of gas in the cooling system.

It is important to observe the engine during warmup and keep monitoring the heat of various hoses, the thermostat operation and so forth.

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2005_cluster_01s.jpg
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