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My 1997 mitsubishi galant temperature gauge is on hot

My 1997 mitsubishi galant temperature gauge went to hot, when I turn off the car, it goes back to cold. What's wrong?

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Posted on Jan 02, 2017

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SOURCE: Temperature Gauge Is Pegging at HOT

Same problem on 2002 Montero XLS. Since manuals are impossible to acquire, I subscribed to (not as good as a Haynes or Chilton's, but better than nothing). From there I was able to get the resistance tolerances for the gauge sending unit and computer temperature sending unit.

The temp gauge sender should have a resistance of 73 ohm at 176 degrees. Since the thermostat is 180, I figured once the engine warmed up, it would be close to that value. The resistance started out at ~700 ohms and gradually dropped to 50 ohms and was still dropping. But it had no wild fluctuations, so assumed it was ok. The computer temp sending unit has a resistance of .26k ohms to .38k ohms. It was rock solid at .24k.

Initially I had replaced the thermostat prior to finding this thread regarding the CPU board problem. Now after checking the resistance, I still wasn't confident that the gauge sending unit was ok (dropping down to less than 50 and still dropping - who knew how the firmware was programmed to translate that data?). Therefore, I went to Carquest and got a new gauge sending unit. Put it in and as you can expect, the problem is still occurring. However, the resistance value of the new one is a rock solid 59.4 ohms. So I question the reliability of the other unit, even though it didn't fix the problem.

AllDATAdiy also mentions a multi-function thermal sensor/switch. Unfortunately, the site does not show where this sensor is located, so I cannot even test.

At this point, I do not feel like taking it in to the dealership and spending money to have my dashboard sent to Michigan (bad design in my opinion that they can't reset/recalibrate at dealership), so I'm going to just buy a separate temperature gauge to mount under the dash. At least I will have peace of mind on the actual temperature. Although I have a feeling at some point in the future I will be replacing the circuit board in question since other gauges in the cluster will probably begin flaking out as well.

Posted on Sep 06, 2008

  • 14 Answers

SOURCE: High temperature gauge reading, low battery voltage reading

The loud whine you speak of indicates one of two things a bad serpentine belt or alternator, The first thing would be to check the belt.Look for cracks worn spots or glazing. If the belt looks ok then take the belt off and start the engine for a minute or so and listen for noise.

Posted on Jan 01, 2009

  • 5158 Answers

SOURCE: 2000 Nissan Altima temperature gauge and heater problem

sounds like you need to replace the thermostat.

Posted on Jan 29, 2009

  • 5158 Answers

SOURCE: oil is milky, ran hot, gauges went crazy, no heat being blown

hate to be the bearer of bad news... it is very likely a blown head gasket...

Posted on Mar 14, 2009

  • 183 Answers

SOURCE: OD on Auto gearbox goes into neutral when cold

You need to have your transmission serviced. The fluid has gotten so thick in there that it builds up too much pressure and your transmission will either kick it out of gear or blow up. I'm glad it actually still works. Once the oil warms up it thins right out and it works no prob. Just service your tranny, and you'll be fine.


Posted on Apr 24, 2009

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2002 Mitsubishi Galant starts when cold but once you turn it off it won't start again....sometimes it'll start after it cools down and sometimes I have to check the sparks plugs and then it'll start...

I went through a the same problem with a Toyota it would start perfect in morning and if I shut it off it wouldn't start hot anyway I would be willing to be it's the ect(engine coolant temperature) sensor. If your car has 2 it's the one for the computer

Aug 15, 2013 | 2002 Mitsubishi Galant

2 Answers

Where is the coolant temperature sensor located on a 2006 mitsubishi galant

Hi and welcome to FixYa!

Just like any other Mitsubishi Galants, the coolant temperature sensor is located underneath the radiator, just besides the big hose. You will need to turn it counter clock wise to let loose of the sensor.

Hope this helps and thank you for using FixYa! Have a good one!

Feb 16, 2011 | 2006 Mitsubishi Galant

1 Answer

Weird problem just started. Noticed the other day when I turned off the car, the fan continued to run for about another minute. Then, this morning, I was sitting in the car with it running and...

the first thing to try is turning the heater upto full heat(a/c off)if the temp guage goes down THEN CHANGE THE THERMOSTAT...(hot oil,if too hot, is thinner than the normal sae rating so the oil pressure will be lower.otherwise no real problem.

Sep 23, 2010 | 2001 Pontiac Firebird

1 Answer

Temp gauge shows hot even if engine has been off overnight?

Locate the temperature sending unit and pull the wire off of it. Turn the key to the on position (do not start) then have someone touch that wire to a ground source and the temp gauge should go from one extreme to another (cold to hot). If the gauge does that, you have a bad sending unit...if it does not move, you have a bad gauge or problem with the wiring to the gauge.

All the temp sending unit does is act like a variable resistor depending on the coolant temp...if it is bad, it will give you a false reading.

Mar 28, 2009 | 2003 Mitsubishi Galant

1 Answer

Check Engine Light On

it sounds like the cooling fans are not working correctly you need to take it in. or you will have very bad damage later. good luck

Nov 24, 2008 | 2002 Mitsubishi Galant

1 Answer


Hi again,

Did the negative battery terminal removal able to reset the instrument CPU?

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 19, 2008 | 2002 Mitsubishi Montero

1 Answer

Have you repaired the temp gauge issue

I have a 2002 Mitsubishi Montero Limited. The other day the temperature gauge went from normal temp to Max HOT. The radiator is still cool enough to touch, it is not boiling over, and there is still coolant in the resivour. The gauge would go back down to normal in a few minutes, but now it immediately climbs to Max Hot within 1-2 minutes of turning the car on.

Jul 22, 2008 | 2002 Mitsubishi Montero

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