Cory S
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- Joined
- Dec 10, 2019
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- Bradford, NH
- First Name
- Cory
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- 2016 Mustang GT Premium
Yeah. That’s normal. As the coolant temperature goes down, so will the pressure in the system. Unless the coolant was 100% cooled down and stable, but even then, anything at 1psi or less, is margin of error.Also I pressure tested the system again at 21 psi and it lost 1 psi of pressure after about 3.5 hours. Don’t think that’s enough to cause issues.
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