Just had a new rear glass and gasket replaced on my car is there any way to tell if the defroster element is working without snow or ice on the glass, does the glass get warm to the touch?

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84 300 Turbo / 320,000
96 E300 D / 55,000

I use the defrost to help clear the dew in the morning

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project

The glass will not get warm to the touch, but you can take a bowl of hot water and put it on the parcel shelf and see if the defroster works. I've done this!