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Car- Outside Temperature Indicator
Posted on 8/5/23 at 4:55 pm
Posted on 8/5/23 at 4:55 pm
Where is the temperature sensor that displays on a cars AC "outside temperature" display? Mine always shows a temp that's about 3-5 degrees higher than the actual temperature. I assume it's picking up engine heat or heat from the body of the car. Any of you mechanic baws know?
Posted on 8/5/23 at 4:57 pm to Shanegolang
Is that the dash of a 99 Buick Century?
Posted on 8/5/23 at 4:57 pm to Sp0728
quote:
Called the sun
Oh ok, thanks. The sensor is on the sun. You've been most helpful.
Posted on 8/5/23 at 4:58 pm to Shanegolang
Because the sensor is in direct sun. Heating up the element/probe.
Posted on 8/5/23 at 4:58 pm to SuperSaint
quote:
Is that the dash of a 99 Buick Century?
2004 Mercury Grand Marquis
Posted on 8/5/23 at 5:00 pm to fightin tigers
quote:
Because the sensor is in direct sun. Heating up the element/probe.
True but mine even shows wrong under my carport......
Really curious about where the sensor is located.
Posted on 8/5/23 at 5:01 pm to Shanegolang
quote:that was my second guess
2004 Mercury Grand Marquis
Posted on 8/5/23 at 5:06 pm to Shanegolang
quote:
True but mine even shows wrong under my carport......
Really curious about where the sensor is located.
Well, you can google, but it is the same idea.
Some materials store heat.
Posted on 8/5/23 at 5:06 pm to SuperSaint
quote:
2004 Mercury Grand Marquis
You let yer grandma out in this heat! Shame on you!
Posted on 8/5/23 at 5:06 pm to Shanegolang
That’s a 96 Chevy Lumina ain’t it??
Posted on 8/5/23 at 5:07 pm to Shanegolang
I think it’s under the car so it picks up hotter temps from the ground or even the surrounding metals.
Posted on 8/5/23 at 5:08 pm to Shanegolang
When I had Avalanches, they would read crazy numbers on days like today.
Posted on 8/5/23 at 5:08 pm to Shanegolang
quote:
Oh ok, thanks. The sensor is on the sun. You've been most helpful.
I agree with you. I think that is heat absorbed by the metal and then radiated. That's different than ambient air temperature. I see the same thing and it usually cools down two to three degrees when air moves over the car while in motion.
Posted on 8/5/23 at 5:10 pm to Shanegolang
Being over superheated asphalt or concrete probably bumps it up a few degrees.
Posted on 8/5/23 at 5:12 pm to Shanegolang
quote:
2004 Mercury Grand Marquis
Probably behind the grille on that car.
Posted on 8/5/23 at 5:12 pm to Shanegolang
quote:
2004 Mercury Grand Marquis
No shame in my man's game. Respect. New cars are expensive.
Posted on 8/5/23 at 5:16 pm to Shanegolang
I wondered the same.
I took my infrared thermometer out with me. Asphalt road was 132, concrete parking lot was 121 with an outside temp of 98.
So I assume the car is measuring the actual air temp the car is passing through.
I took my infrared thermometer out with me. Asphalt road was 132, concrete parking lot was 121 with an outside temp of 98.
So I assume the car is measuring the actual air temp the car is passing through.
Posted on 8/5/23 at 5:17 pm to Shanegolang
Mine said 111 10 minutes ago.
Covington. Black vehicle
Covington. Black vehicle
Posted on 8/5/23 at 5:21 pm to Shanegolang
Part of the reason is because it’s not actually a standard thermometer, it’s something called a thermistor. A thermistor measures the change in electrical current as a result of heat added or removed, rather than directly measuring temperature. It’s usually pretty accurate… except when you mount it in a car engine where it is exposed to re-radiated heat from the asphalt surface. That makes it read a higher temperature than it actually is because the re-radiated heat gives a higher reading since the thermistor is based on the electrical current.
This post was edited on 8/5/23 at 5:22 pm
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