Coolant temp not reading correctly...

[BlackHalo]

Both my dash gauge and my ecu are reading super low coolant temps. I let the car idle for about 20 mins and the temp went from 20-90 and ended up staying in the 89-91 range once the car warmed up at idle. And the gauge was held steady at the first line on the stock cluster.

This sound like a coolant temp sensor problem or???

 

[knochgoon24]

Check to make sure the connector isn't corroded.
If that's fine, replace the sensor.
If you still have problems, the wiring between the sensor and the ECU may be bad.

 

[kersed]

have you checked for air in your cooling system I heard that makes it do funny things it made my fans not run

 

[TrevorS]

Both my dash gauge and my ecu are reading super low coolant temps. I let the car idle for about 20 mins and the temp went from 20-90 and ended up staying in the 89-91 range once the car warmed up at idle. And the gauge was held steady at the first line on the stock cluster.

This sound like a coolant temp sensor problem or???

Thanks...

Are you sure your thermostat is good? If it's stuck open, it will drop your temps.

 

[Defiant]

Sounds like a thermostat that is no longer closing all the way.

 

[MuffinMan7580]

It sounds like you have the coolant temperature being shown in celsius instead of fahrenheit.

 

[spyderturbo007]

You have 2 coolant temp sensors on the thermostat housing, one feeds the gauge and the other feeds the ECU. If both sensors are reporting a cold temperature, I can't see them both going bad at the same time so the readings are probably good. As Defiant said, look to the thermostat first.

 

[Mrdrd_Laser]

Definately sounds like a thermostat problem. Take it out and throw it in some boiling water and see what it does....Then run it under cool water to see if it closes all the way

 

[nyTalonTsi]

Sorry to bring it back from the dead. I got a weird problem i think the cts is to blame.

My car is hard to start in the morning, now that the cold is here it takes even longer to start plus it has a little misfire at idle. And sometimes in idle my temp gauge rises then all of a sudden goes back to normal.

I just bought a new coolant temp sensor( the ecu one) from autocrapzone. I take out the old one, put in the new one, plugged on the clip went to start the car up and nothing it wouldn't turn over.

I was like wtf??? I grab the old cts take the connecter off the new one and put it on the old one the car started up. I didn't have anymore time, im still at work to throw the old cts back into the therm. housing.

So yeah the new one is plugging up the hole while the old one is hanging there not reading coolant.

I pull into work in idle all of a sudden the temp needle went sky rocket. The radiator fan didn't come on and the motor wasn't really running hot, when i put my window up the gauge got even higher so its grounding somewhere.

I turn it off for a couple minutes, put the key in the ON pos. the temp needle is back in the middle.

I have three questions......

Would the coolant temp sensor that has the connecter plugged on it give me these crazy reading because its not seeing any coolant?

Ive seen many dsms run without having the connecter plugged into the cts, they just have hard starts. Mine wouldn't start without the cts plugged in?

How do i buy a coolant temp sensor that actually works? Mitsu?

 

[kyanox]

Bump. Anyone ever purchased a coolant temp sensor from the parts store, only to have it read 33 deg Fahrenheit when installed by the ECU?