Glow plugs of the E 320s Diesel heat up extremely fast.
My question: do they use RF (radio frequency) as heat source or some other method?
I would like to know about that.
Thanks.

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Nyck - TX - USA

No just a very efficient element. It’s rated at a low dc voltage (approximately 5-7 V dc) and the controller uses pulse width modulation (PWM) to heat up the element quickly without melting it. By altering the on-off ratio it is possible to vary the energy disspated in the heater.

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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