[tyrfing]

Air conditioning was fairly easy for both parties to agree on, due to a very successful PR campaign that the company wants to bury. Something like an accelerated schedule to retrofit current vehicles would be expensive to negotiate and result in sacrifices elsewhere.

Cabin AC won't fix cargo areas hitting 140s, and most drivers wouldn't agree to lose $5/hr for AC today or something like that. The heat shield is for the cargo compartment, along with improved air intakes / ventilation and possibly other mitigations - they get absurdly hot and have minimal airflow.