On Sat, 5 Aug 2017 08:21:33 -0700 (PDT), trader_4
wrote:

On Saturday, August 5, 2017 at 11:08:36 AM UTC-4, Jon Doe wrote:
On 8/5/2017 10:00 AM, Bram van den Heuvel wrote:
The question is how far can you drive on an unpressurized system?

There are too many factors (vehicle speed, engine load, ambient air
temperature) to determine if it's safe. The overheat risk and resultant
engine damage may not be worth it. YMMV

+1

If it's a minor leak and local, easy driving, I would do it. Crossing Death Valley pulling a trailer, probably not.

Death Valley recent trivia.

_Death Valley had hottest month ever in Western Hemisphere in July_

https://www.reviewjournal.com/weather/death-valley-had-hottest-month-ever-in-western-hemisphere-in-july/

You can die out there if you pull off the road and get stuck. Its
happened before. You need water.