stamp11127
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Doesn't sound like it is running long enough to heat the coolant to the point of opening the t stat. The radiator comes into play once the t stat opens.
Overheating
- Thread starter Canyon Man
- Start date
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Canyon Man
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There still must be air in it somewhere..
Bedrck47
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yes that should give you a good idea
Bedrck47
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with the gauge coming on at the half way point I would suspect the sensor. need to get a ohm value of the sensor
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Canyon Man
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New code...P1289, I'm researching it now.
Bedrck47
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Bedrck47
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DTC
P1289 - Cylinder Head Temperature (CHT) Sensor Circuit High Input (PCM STRATEGIES UP TO AND INCLUDING 1998)
Description
Indicates a CHT sensor circuit malfunction (shorted).
Possible Causes
Grounded circuit in CHT harness
Damaged CHT sensor
Improper harness connection
Damaged PCM
Diagnostic Aides
Using signal simulation, disconnect sensor and simulate a voltage on sensor signal circuit. Simulated 1.0V signal and scan PID voltage value should be similar. If voltage is similar check sensor, if voltage is not similar check related circuit and PCM. Note DTC P0117 may also be reported, this will activate the MIL light.
P1289 - Cylinder Head Temperature (CHT) Sensor Circuit High Input (PCM STRATEGIES UP TO AND INCLUDING 1998)
Description
Indicates a CHT sensor circuit malfunction (shorted).
Possible Causes
Grounded circuit in CHT harness
Damaged CHT sensor
Improper harness connection
Damaged PCM
Diagnostic Aides
Using signal simulation, disconnect sensor and simulate a voltage on sensor signal circuit. Simulated 1.0V signal and scan PID voltage value should be similar. If voltage is similar check sensor, if voltage is not similar check related circuit and PCM. Note DTC P0117 may also be reported, this will activate the MIL light.
Canyon Man
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dammit...Radiator is fine. As I filled it from the top it flowed now problem through the bottom. Back to the drawing board,,,,Has to be air somewhere..Also checking wiring like you stated Roxy1225
Last edited:
Bedrck47
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Going back to post #11 in this thread you reported temp gauge reading 259 but the hoses were much lower if the sensor is giving a false reading then the temp thru the hoses would seem normal
other than a high gauge reading were you having any other signs of overheating??
the gauge reading half way this morning after sitting for 12 hours makes me think the sensor is bad
other than a high gauge reading were you having any other signs of overheating??
the gauge reading half way this morning after sitting for 12 hours makes me think the sensor is bad
Bedrck47
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one way to check this would be to get a new sensor but don't install it just yet
connect it to the connector and see where your gauge reads if the gauge reads where it should be when its a cold engine then that would prove the original sensor is bad.
then with just having the new sensor connected try to put the sensor in some very hot water and see how the gauge reacts if everything then acts normal replace the sensor that's in the engine.
before doing this try to get the ohm reading on the new sensor
connect it to the connector and see where your gauge reads if the gauge reads where it should be when its a cold engine then that would prove the original sensor is bad.
then with just having the new sensor connected try to put the sensor in some very hot water and see how the gauge reacts if everything then acts normal replace the sensor that's in the engine.
before doing this try to get the ohm reading on the new sensor
