Question about 2003 Mercury Sable

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Temperature Gauge Stays Cold on 2005 Sable

The needle on my temp gauge stays below the first line all the time. The check engine light is on and the code is for "coolant temperature below thermostat threshhold". I replaced the thermostat, but didn't have an impact. The heater warms up and blows hot air without any problem, even in 10 degree weather. I'm thinking the ECT Sensor may be faulty. Does that sound like the case to you? If so, where can I locate the ECT Sensor on my engine? It's a DOHC 3.0 liter engine. Thank you much!

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Look on the intake it should be there

Posted on Jan 26, 2009

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1 Answer

Looking for wire for heater gage temperature


Depending on the year there isn't any . All done by computer on serial data bus communication network. The coolant temp. is supplied to the engine computer By a ETC - engine coolant temp sensor . All the modules on the vehicle ( ABS , air bags , BCM , instrument cluster , RKE module etc... ) Share info on this data bus network . If the gauge isn't working probably bad ,If a communication network problem the gauge will default to fixed temp degree . This is for a 1999 Buick , out of factory service repair manual . But all vehicles are pretty much the same .
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The Powertrain Control Module (PCM) via the class II serial data line to the instrument cluster, broadcasts the coolant temperature. The instrument cluster compares the temperature data using a 16 point look-up table in order to determine the needle deflection. A smooth filter is used in order to secure a continuous response. The instrument cluster drives the temperature gauge to C (cold) under the following conditions:
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1 Answer

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Yadayada ,don't know where you came up with that . This vehicle has just one ECT - engine coolat temp. sensor . It's an input for the PCM - engine computer . The PCM sends this info to the instrument cluster over the class2 serial data bus. . The proper way to diagnose a problem like this would be to hook up a professional scanner an check input data to the PCM , an instrument cluster . Not guessing an replacing parts .
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What engine ? could have come with a 3.4 or 3.8 L .
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Left side of the engine, below the thermostat outlet

Engine Coolant Temperature (ECT) Sensor (LA1)
LH side, top of the engine

Both are close to the thermostat housing , do you know what an where that is ? Follow the top radiator hose to the engine , should be near there . Look at the new part ,can't you match it up.

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The sensor you replaced was the ECT (engine coolant temp)? Check your coolant level and air in the lines. Do a coolant pressure test to make sure the cooling system holds pressure, If it doesn't, you may have a head gasket problem.

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