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If you want to use the van before the new resistor arrives, it will overheat to some extent for sure, because when the first (lower) temperature threshold is reached and the PCM instructs the fans to switch on at low speed, nothing will happen. Same if you switch on the A/C - the low speed cooling fan circuit should activate but nothing will happen.

In both cases, no cooling will happen until the second (higher) threshold is reached, upon which the high speed cooling fan circuit will be activated and the fans will indeed run at that point.

So I'm going to suggest that you fit a bypass wire in place of the resistor for a few days, just until the resistor arrives, and that way your fans will still operate. I want to have a look at the wiring diagram first though so I'll go and make a cup of tea and check the diagram, and I'll post again later.