No/Low Temp reading - how to test sensor
#1
No/Low Temp reading - how to test sensor
I got this car last year, no temp reading was occuring and radiator was leaking.
Replaced Radiator and bled system correctly (twice) -filled from upper point on this DOHC and still getting no reading. New Temp sensor was put in.
Here are the questions:
How do I test the
1) Sensor to make sure the car is in range
2) Gauge: how do I confirm the gauge is working correctly - if not how do I replace?
3) Fan: I am assuming the fan turns on by computer, what is the turn on temp and how can I test?
Thanks for your help!
Replaced Radiator and bled system correctly (twice) -filled from upper point on this DOHC and still getting no reading. New Temp sensor was put in.
Here are the questions:
How do I test the
1) Sensor to make sure the car is in range
2) Gauge: how do I confirm the gauge is working correctly - if not how do I replace?
3) Fan: I am assuming the fan turns on by computer, what is the turn on temp and how can I test?
Thanks for your help!
#2
You're going to need to back probe (stick a paper clip or something in the back of the connector) the signal wire as the engine heats up to measure the voltage it is putting out. It should increase steadily as the engine warms up.
#4
You can't test it with an ohm meter unless you just want to know it isn't literally broken inside. The resistance changes with temp. It's only a two pin sensor so just ohm across the pins.
However like I said you need to measure it's voltage output. One pin should be 5 volt reference and one signal.
However like I said you need to measure it's voltage output. One pin should be 5 volt reference and one signal.
#6
would the temp continue to remain low?
It has been my experience that a stuck open tstat will slow down the rate at which the coolant heats up, but will still get to op. temp. Since I have no history of repairs on this car, outside of the radiator and sending temp unit, I will replace the themostat if it is an easy repair. I am more familiar with 5.0, LT1 and M54 engines so not sure how difficult replacing the tstat is on this car.
#7
Either way, warm the car up so the motor is noticeably warm to the touch. Then back probe each wire one at a time. The voltage on one wire should be 5 volts. The other wire should be somewhere between 0 & 5 volts. If the sensor is working properly, and the car is fully warmed up, you’ll get a voltage somewhere in the middle.
Yes, this is true if the car is sitting still. The cooling fan will kick in to keep the engine temps in check. But if you drive the car the air flowing through the radiator will cool the coolant down lower then normal temps.
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11-10-2015 11:39 AM