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Comes With Own R2 Unit - 2015 Chevrolet Colorado Long-Term Road Test

Edmunds.comEdmunds.com Member, Administrator, Moderator Posts: 10,315
edited July 2015 in Chevrolet
imageComes With Own R2 Unit - 2015 Chevrolet Colorado Long-Term Road Test

Every car with automatic climate control has a sun-load sensor at the base of its windshield, but the one in our 2015 Chevrolet Colorado looks awfully familiar.

Read the full story here


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    kirkhilles1kirkhilles1 Member Posts: 863
    Haha, it really DOES look that like R2. That being said, what the heck is a "sun load sensor"? Sounds like something that can break to me.
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    s197gts197gt Member Posts: 486
    edited July 2015

    Sunlight entering a vehicle can account for up to 60% of the interior heat load that the system must overcome.

    Sunload sensors monitor the intensity of sunlight and adjust the HVAC control to improve the comfort level of the driver and passengers on sunny days. Sunload sensors are usually located at the top of the dash and are often mounted on a removable plate, speaker grill, or defroster vent. There is often one on either side of the dash to accommodate differences in sunlight exposure.

    Most sunload sensors are the photodiode type, which provides increased resistance as the light intensity increases, so the signal from the sensor drops as the sun shines brighter. The operating range is between 0 and 5 volts. As the sun load increases, the voltage decreases. The signal is sent to the unified meter and A/C amp, which provide instructions to the system to adjust blend doors and fan speed.

    Bright sunlight conditions can result in the fan speed increasing, and blend doors opening to improve cooling.
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    allthingshondaallthingshonda Member Posts: 878
    edited July 2015
    Just about every GM car has this because it serves two purposes. It is a sun load sensor for the HVAC but it also needs this for the automatic headlights.
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    quadricyclequadricycle Member Posts: 827
    Might be a great reason to buy a Colorado instead of a Tacoma...

    I'd be driving down the road and saying things like: "Surge all power units R2, stand by and reverse thrusters!"

    Seeing a Prius, "Lock on to 'em R2."

    "We got them, R2!"


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    jlaszlojlaszlo Member Posts: 60
    I would buy the Colorado just for the R2 unit. Disney owns the Star Wars franchise and GM is the Test Track sponsor at EPCOT. Make it happen!
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    lostcommalostcomma Member Posts: 13
    This R2 unit is a great thing about buying a gm. Since I drive at night mostly u see what vehicles don't have auto lights standard. Most commonly Camrys, Escapes, Grand Caravans, Journeys and oddly Lexuss although I have been told it's because the operator has turned off the auto function. Of course it's an option and comes with higher trim levels
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