Got a temperature gun -- Measured the cooling system
Pro Wrench
Joined: Dec 2016
Posts: 1,603
Likes: 229
From: Fall City, WA
Based off the comment of going up hill the temp spiked would leave me to believe the air pocket moved to where the sensor is located and not the sensor itself
Yeah it could be in the area of the sensor for sure (I’ve dealt with plenty), but highest I ever got was 229F to 235F tops with an air pocket. 260F just sounds a bit high to me.
Does the heater have a good heat output? I could certainly see a pocket of air stuck in that area with a blocked heater core. The air bubble really wouldn’t have anywhere to go.
If the heater core isn’t clogged with good heat the air pocket should make it’s way to the T eventually after several hot/cold cool down cycles.
Does the heater have a good heat output? I could certainly see a pocket of air stuck in that area with a blocked heater core. The air bubble really wouldn’t have anywhere to go.
If the heater core isn’t clogged with good heat the air pocket should make it’s way to the T eventually after several hot/cold cool down cycles.
Last edited by Best4x4; Mar 20, 2018 at 04:13 PM.
Pro Wrench
Joined: Nov 2015
Posts: 1,935
Likes: 189
From: Coastal Georgia
Rare but they can be faulty
You can get a very good idea of sensor accuracy by taking a IR reading right there at the manifold where sensor is mounted. My sensor/ScanGauge was about 5 degrees warmer than the IR indicated.
The lower sensor should not cause an erroneous temp reading. It's role is to monitor temp differences no to indicate ETC. '01 probably doesn't have the lower sensor but if it does no harm in changing if it makes you feel better.
You can get a very good idea of sensor accuracy by taking a IR reading right there at the manifold where sensor is mounted. My sensor/ScanGauge was about 5 degrees warmer than the IR indicated.
The lower sensor should not cause an erroneous temp reading. It's role is to monitor temp differences no to indicate ETC. '01 probably doesn't have the lower sensor but if it does no harm in changing if it makes you feel better.
The thermostat monitoring sensor is located in the radiator, adjacent the bottom hose. The ECM compares the
temperature measured by the thermostat monitoring sensor to the temperature measured by the ECT sensor. If the
difference between the two readings is too great, the ECM determines the thermostat is stuck. In this case, the ECM
registers a fault code in its memory.
temperature measured by the thermostat monitoring sensor to the temperature measured by the ECT sensor. If the
difference between the two readings is too great, the ECM determines the thermostat is stuck. In this case, the ECM
registers a fault code in its memory.
On a few SAI equipped D2’s I worked the system set faults and was basically acting like the old days with Prince of Darkness electronics. New Bosch sensor on the SAI’s extra temp sensor and no more stupid P0126 or irrelevant fault codes.
I had an 02 that was a nightmare with codes that wouldn’t pass state inspection and SAI was my nightmare. All other SAI trucks I’ve had zero issues.
SAI was around from 99-04. On earlier models it had to be a low emissions CA sold vehicle. 03-04 = it was pretty much standard equipment although some 03’s have passed thru my hands without SAI and were imported into TX or LA.
I had an 02 that was a nightmare with codes that wouldn’t pass state inspection and SAI was my nightmare. All other SAI trucks I’ve had zero issues.
SAI was around from 99-04. On earlier models it had to be a low emissions CA sold vehicle. 03-04 = it was pretty much standard equipment although some 03’s have passed thru my hands without SAI and were imported into TX or LA.
Last edited by Best4x4; Mar 20, 2018 at 08:27 PM.
