It’s to never leave a child or pet in a vehicle, not even for a quick stop,” said Bernalillo County Fire and Rescue Engineer William Harris. With temperatures like we’ve seen in recent days, there is absolutely no safe amount of time for kids or pets to be left in a hot car. “So, no, cracking the window provides very little cooling and does not prevent the temperature inside from reaching the dangerous levels,” said Harris. KOB 4 tested the idea that cracking a window could help lower the temperature inside a car Thursday afternoon. So, that’s a scary, scary thing that could happen as well,” said Harris.