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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
hey guys i have a wierd thing going on, i have a lot of pressure in my coolant system when i start the car and drive it a quarter mile and turn it off. i take the cap off and it blows like crazy! and the water is still cold. the other thing i noticed was that i have pressure after the car sits over night? should i always have this pressure in the coolant system?
A little pressure is normal as the coolant heats up.
The only other thing would be a whole lot of air in the system. I only run a 7psi cap and it has never blown from pressure.
yea i know i should have some pressure, but i have pressure way before the car even gets warm, i can still touch the headers cold haha. i would say i have a leak in a line somewhere but that wouldnt hold the pressure then.