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Either universal green or red ELC (extended life coolant), depending on what engine it has.
Either green coolant or red ECL (extended life coolant), depending on year and make and model of engine.
General Motors changed to Dexcool Extended Life coolant in 1996. It is the orange colored coolant. Green coolant will not hurt the system, it must be replaced about 5 times as frequently though. Beware that once you use green coolant in your cooling system, it is very dificult to remove completely if you want to use the extended life coolant in the future.
extended life "red coolant' Tell the people at the parts store and they will get you the oem coolant (do not mix red and green)
For the 1999 Ford expedition it is recommended that you use the Ford Premium engine coolant which is green in color. You should not use the Ford extended life engine coolant which is orange in color.
If you have the LT1 engine with alum. heads, the orange Dex-Cool extended life coolant is recommended.
The GM brand name is "DEXCOOL". This is the orange colored extended life coolant. All anti-freeze makers make this type of coolant. The older green coolant is ehtylene glycol based, then Dexcool is not. - TechJK -----------------------------------------
Any polyethylene glycol antifreeze... regular green or red Extended Life Coolant (ELC).
50% mixture of Dex-Cool and water. Other 'universal' extended-life ethylene-glycol based coolants are also acceptable but do not use 'green' coolant with silicate based corrosion inhibitors.
According to the Owner Guide , it originally came with a 50 / 50 mixture of Ford Premium engine coolant ( green color ) and distilled water The Owner Guide shows not to use Ford Extended Life coolant ( orange in color ) and DO NOT use Dexcool
1990 was before GM switched to using Dex-Cool extended life coolant, so any of the traditional green ethylene glycol or universal coolant/antifreezes would work perfectly. Any brand will suit the car well.
The Cummins ISX uses red ELC (extended life coolant).