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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.
So I just put a new water pump and thomentor in my 1990 mustang gt..put band new 50/50 antifrezze in it(green) and i found that the hose connect to my heating core was off so i put it back on...it ran great for a day then when i got home from work the low coolent light was on so i went to put more in and coolent shout out and it was a white formy with brown whirls in it...is it oil is it bad leak stoper....when i bought mustang it had been setting for a year plz help
Hose to heater core disconnected. Might be the heater core was leaking thus the low coolant light on. Flush coolant system when finish the heater core.