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So the blower is on a 30 amp fuse. To blow the fuse you need to draw more than 30 amps. If the small wire going up to your relay shorted out it would probably melt / catch fire before it drew 30 amps of power. That's why you need to put the 12v source for your relay on a lower amp fuse, like the one for the dome light or radio, both of which are 8 amps in my car.
In your case you might just want to jumper the two wires going to the high pressure switch and have your fan run whenever the key is on. When it cools down in the fall you can simply return the wiring to stock.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket 
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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