Teamsters Local 89 said UPS trucks frequently reach over 120-degrees in the summer.
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Wednesday marked the third day for more than 100 Sysco truck drivers in Louisville on strike in a dispute with the company.
The cabinet maker said it hopes to fill remaining positions in coming weeks.
The company said it gave its final offer last week -- and the union rejected it.
Thousands of UPS workers have been promised retroactive pay raises under a new labor contract that is still pending six months after a national vote. Workers who leave now may never get the raises.
Louisville's largest employer could face a standoff with its workers.