Question about 2001 Chevrolet Venture

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Replaced coolant thermostate sensor and temp gauge is still reading below the cold line. what else could it be?

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If you are getting good heat from your heater chances are it's the gauge that's faulty; however, often new thermostats can be defective. Put the thermostat in a pot of water & bring it to a boil observing when it opens. If it opens when the water is only warm then it's no good. If it's stuck open when cold, it's no good. Hope this helps, Good luck!

Posted on Mar 16, 2011

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Engine temp gauge not reading and ac will not turn on due to engine hot warning, diognostics say its a sensor, need to know which one and can i do it myself?2003 saturn vue


What diognostics say its a sensor ?????? No diagnostic's ever tell's you it's a sensor . You as a technician would need to prove that by testing electrical circuits , viewing coolant temp sensor . Hooking scan tool and trying to command the gauge with by directional control . The temp gauge not showing any temp. ? No movement ? Engine Coolant Temperature Gage Inaccurate or InoperativeStep Action
Yes
No
Schematic Reference: Instrument Cluster Schematics
1
Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
2
Install a scan tool.
Turn the ignition ON, with the engine OFF.
With the scan tool, perform the Lamp and Gauge Check in the IPC Special Functions list.
Does the engine coolant temperature gage move up and down when commanded?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
3
Replace the IPC. Refer to Instrument Cluster Replacement .
Did you complete the replacement?
Go to Step 4
--
4
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
Would hate for you to replace the coolant temp sensor an find out that's not the problem ! Does the vehicle start an run good ,trans mission shift good ? If so it's not the coolant temp sensor .
Engine Coolant Temperature Gage
The ECM sends coolant temperature as determined by the coolant temperature sensor to the BCM via CAN serial data. The IPC displays the engine coolant temperature with the gage when the BCM sends a class 2 message to the IPC indicating coolant temperature percentage. The engine coolant temperature gage defaults to cold (0°) or below if:
• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of class 2 communications with the BCM.
• The BCM detects a loss of CAN communications with the ECM.

Aug 19, 2017 | AC Cars & Trucks

1 Answer

Truck never reaches operating temperature


low operating temperatures is an indication of an air lock in the cooling system
gauges need the sender unit to be fully immersed in coolant to work but if they are not then the variable resistance material in the sender bulb cannot accurately relate to the coolant temperature
example if you have leak develop in a good system and you do not regularly scan your gauges like a good drive will do. it is possible that you will smell a dying engine yet when yo look at the gauge it will be reading cool to cold because the coolant has dropped to a point where the sender is no longer in contact with the coolant

May 21, 2015 | 1989 Ford F 150

1 Answer

Cause no heat temp gauge red lined in


sounds like the thermostat is stuck shut..unless the head gasket is blown somewhere.. it will pump the antifreeze level down to form an air pocket.. this will cause overheating constantly check each cylinder for even compression..the lowest reading will most likely be the blown cylinder..

Dec 15, 2013 | BMW Cars & Trucks

1 Answer

Hard to start when cold. . . ive herd it runs rich when first staring because of the tbi system. what i herd is the coolent sensor on the left side of the block tell the pcm or pcu to give a hotter spark...


the engine coolant temp sensor tells the PCM to regulate fuel control until the truck warms up and then the O2 sensor then controls the fuel . the computer can't adjust the amount of spark(hotter or colder spark) only the timing. the engine coolant temp sensor will have 2 wires going to it while the temperature sending unit(the one for the gauge) has only 1 wire going to it.YES, if the engine coolant temp sensor is bad and is telling the PCM that the truck is already warm or hot at cold start up then it makes the truck harder to start.

Aug 12, 2011 | 1992 Chevrolet S-10

2 Answers

2005 trailblazer code 0126 checked reset didnt come back on yet'but dont show that code in my list


www.obd-codes.com/trouble_codes insufficiant coolant temp for stable operation thats an uncommon one. unless u have no thermostat or to cool of one u shouldnt have that code again usualy comes on when a seensor is wrong, bad but not out of range for the computer to show coolant temp sensor. very uncommon. if it comes back on again then check ur sensor and wires also it may have just been ur thermostat stuck open. u may want to put a new one in it it runs cold. u should be able to tell by the gauge if ur temp is ok. most gm engines have two sensors. one for the computer and one for the gauge. not always though.

Nov 18, 2010 | 2005 Chevrolet TrailBlazer

1 Answer

Getting codes PO431, PO421, PO128


2003 saturn vue, we dont have the engine size, the codes should be and are the same, po 128 means; cooling temp is out of spec, make sure the coolant is full, then replace the coolant emp sensor and make sure the connection is good, i would also replace the thermostant, this is a common code on these and most of the time its the coolant temp sensor or thermostant, ive learned to replace then both to avoid future engine lights with code po128. next we will check the code # po421, this code is that the computer sees that the cat converters are taking to long to warm up, code po 431 is also the same as po421, this code is related to the thermostant and sensor, the sensor give the computer the wrong temp readings and then the compuetr thinks the engine is hotter than it is and thinks the converters should be also hot like the motor but the coolant temp is giving a false reading, if you replace the coolant temp sensor and the thermostant and fill coolant , then reset the light and you will solve the problem, i hope this is helpful, also the sensor is located to the right of the engine if you are standing in front of the motor, heres a picture of the sensor, remember to check connector heres a pic of the connector, good luck.johnjohn2_20.jpg

Nov 10, 2010 | 2003 Saturn VUE

2 Answers

2005 chev equinox,check engine light on,was diagnosed as engine coolant temp sensor,replaced and light came back on,also engine is running cold will not generate any heat... had car back to shop and they...


Lots of newer GM vehicles have a code that reads, engine temp below regulated temp or voltage, thats a thermostate issue. Also as mentioned this is a good time to do a flush.

Dec 26, 2009 | 2005 Chevrolet Equinox

1 Answer

I have a 2003 volkswagen jetta, no owners manual, outside temps have been really cold, below the temp gauge a temp light comes on and a chime sounds, temp gauge runs fine, had a friend ck coolant, it...


does it do this first thing when its cold out ?? if so, fill the coolant res to the max line when cold, if light still comes on, it could be either the coolant leven sensor (my guess) or the temp sensor for the engine- these are known to go bad every few years

Dec 11, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Temp Gauge Reads Hot all the time and i have heat


as soon as you turn it on after it has been shut off for how long? you could have a bad sensor. if you have a sohc (single overhead cam) engine you have a coolant temp sensor. if you have a dohc (double overhead cam) engine you have a cylinder head temp sensor. either way you will need to start with everything cooled off, drain the coolant, remove and replace the sensor. for the sohc engine you have to remove the ignition coil to get to the sensor, for the dohc you have to remove the alternator. in both engines you are supposed to torque the bolts that hold the sensor in place to 89 in-lbs, tight enough to not have a coolant leak at that point, and not so tight that you stretch the bolts or break them off in the block. if you still have a problem after you replace the sensor then you probably have a bad water pump. hope that helps.

May 26, 2009 | 2000 Ford Focus

1 Answer

Temp gauge


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.

Jun 11, 2008 | 1998 Chevrolet Cavalier

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