A software update to some Amazon delivery vehicles is automatically turning off the air conditioning after a few seconds if the driver is not in their seat, according to multiple Amazon delivery drivers who are complaining about the update online.

According to Amazon delivery drivers, the new update is for the Amazon EDV (electric delivery vehicle), the custom-built Rivian van. Delivery drivers say that this update automatically turns off the air conditioning in the van if the driver is not in the vehicle for more than 30 seconds. Drivers are complaining about the update as the start of the summer season, which can be particularly difficult and dangerous for delivery drivers.

“As many of you are aware, the EDVs just got a software update where if you are out of your seat for 30 seconds with the side door open, the AC switches off,” one Amazon delivery driver said in an online forum for drivers. “We all hate this obviously.”