I have a 2000 Silverado and the overflow reservoir has a fill and pressure release in the lid. This pressure tester did not work for this application. During the day I work as a ventilation and air conditioning technician and at night as a gear specialist. I even tried taking it to a local workshop to see if they could get it to work but it didn't work on my truck. They tried it on a Honda that was there and everything worked fine.
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