100C seems too warm for normal operating temp. Mine runs at 80-85C generally unless more than 100f outside.

You can check operation of the Aux fans by turning key to pos 2 and then pressing and holding both AUTO buttons on the CCU for 10-15 secs. The fans should engage (pulsing initially is normal) and run at full power. Key off to stop.

If they run you can rule out the elect motors and prob the relay too and move on to sensors.

You can monitor coolant temp while driving using the CCU: hold REST for 5 secs, then using either AUTO button to toggle to screen 6. May read in C or F.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)