Any idea as to why I have divergent exterior temperature readings? On the instrument cluster it says, say, 22F. But on the actual readings display on the climate control unit it might say 28. Do they work off of different sensors?

Not a big deal....just curious.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Yup

The cluster number comes from the sensor in the grill below the bumper.
The climate control number comes from the sensor in the air intake plenum.

The cluster number is speed compensated so that it does not go up when sitting in hot traffic. The cluster is most accurate when the car is moving.

The climate control IAT sensor is reading the actual intake temperature, the climate control needs to know this so that it can regulate properly. It is not speed compensated.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech