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If its only getting hot on interstate you have a plugged radiator, or since it is new aftermarket perhaps inadequate capacity? Did you doublecheck the sensor by shooting with the IR gun at the locations I suggested?
If its only getting hot on interstate you have a plugged radiator, or since it is new aftermarket perhaps inadequate capacity? Did you doublecheck the sensor by shooting with the IR gun at the locations I suggested?
I was going to ask about the radiator. Highway use should see plenty of airflow past it and not much heat from the engine unless towing.
If its only getting hot on interstate you have a plugged radiator, or since it is new aftermarket perhaps inadequate capacity? Did you doublecheck the sensor by shooting with the IR gun at the locations I suggested?
I did and the numbers were all over the place. Pasted them above but they were kind of buried.
Here are the temp readings from various place while idling after the Interstate run with the AC/Fans on and OBD Coolant temp reading 188.6F.
Metal coolant tube on the lower intake: 3 readings 156.6, 162, 175.8 On the hose before the inline thermostat: 141.1 Heater Hoses: Intake Manifold beside coolant sensor: 161.2 Oil Pan: 3 readings 122.7, 135, 139.5
I did and the numbers were all over the place. Pasted them above but they were kind of buried.
Here are the temp readings from various place while idling after the Interstate run with the AC/Fans on and OBD Coolant temp reading 188.6F.
Metal coolant tube on the lower intake: 3 readings 156.6, 162, 175.8 On the hose before the inline thermostat: 141.1 Heater Hoses: Intake Manifold beside coolant sensor: 161.2 Oil Pan: 3 readings 122.7, 135, 139.5
These were with no thermostat element installed, correct? If so I would say you have sensor problem or your IR gun is out of calibration. The intake manifold and coolant pipe should be reading the same as the sensor. There might be some slight skin cooling, but not more than 2-4 degrees. Aluminum is a great conductor and the coolant temp and aluminum intake are going to be very close to the same temp. Also, the intake has so much thermal mass it will be hard for it to cool down quickly.
These were with no thermostat element installed, correct? If so I would say you have sensor problem or your IR gun is out of calibration. The intake manifold and coolant pipe should be reading the same as the sensor. There might be some slight skin cooling, but not more than 2-4 degrees. Aluminum is a great conductor and the coolant temp and aluminum intake are going to be very close to the same temp. Also, the intake has so much thermal mass it will be hard for it to cool down quickly.
Correct, still with no thermostat. I have an adapter that should be showing up Sunday to put a sensor in the thermostat housing to verify the data from the Delphi sensor that I installed a little while back.
Last edited by Sandman614; Jul 21, 2022 at 08:54 AM.
Although I have an LS swap and I my right is heavy, I was experiencing some temps I wasnt that comfortable with. I just installed the Hayden 2991 and doreman 620-112 and my temps on highway at 70mph in summer with AC where getting 215-225 degrees. After clutch and fan install I am not breaking 195 degrees...
Got my 3/8-1/8npt adapter to install my external temp sender today. Wouldn't ya know it the Delphi temp sender I installed a while back is apparently not the right resistance and reads 10-20F higher than the external gauge. I didn't have a reason to suspect the temp sender because the temp readings seemed realistic for the original cooling system. New NTK temp sender should be here Tuesday and I'll make a few more runs and post new graphs.
Nothing is ever as easy as it should be.. I jumped on RockAuto and grabbed a part number for a NGK/NTK Coolant sensor to order from Amazon. It showed up 3/4 days later and I got the A/C compressor out of the way to remove the old one and realized it was not the right sensor... Apparently SAI models have a sensor in the Radiator as well and this was that one.. I got back on RockAuto and looked for the right sensor, they only show Beck/Arnley and Standard Motors.. I searched around and found the correct NGK/NTK one and it's $80... So I ordered the Beck/Arnley.
The Beck/Arnley sensor is reading similar to the Delphi one, closer to correct at lower temps and progressively worse at higher temps, compared to the External Sensor. I have the OE LR sensor still, I will clean it up and test it against the External Sensor.
Although I have an LS swap and I my right is heavy, I was experiencing some temps I wasnt that comfortable with. I just installed the Hayden 2991 and doreman 620-112 and my temps on highway at 70mph in summer with AC where getting 215-225 degrees. After clutch and fan install I am not breaking 195 degrees...
i wouldn't think a fan and clutch would affect highway driving. isn't the clutch disengaged at those speeds?
I have not. That seems counter intuitive for interstate running?
Sure, bypassing is not intended for normal operation, but it could be interesting to see the effect of the maximum airflow vs. the regulated airflow. This will be an indication how much the fan is utilized in normal operation and how much reserve is left.
