New coolant

[adavis11]

I have a 99 7.3 and am wanting to change out the coolant. I called ford and they told me to use any 50/50 mix. I just wanted to get a second opinion to see if this is right or if I should be using something else. Also should I be adding a additive to the coolant and what are the intervals the coolant should be changed? Sorry for all the questions.

[gomer pyle]

Ford Super Duty Coolant Flushing Procedure | Superdutypsd.com
this should answer all your questions

[jesilvas]

Use a 50/50 final mix. It's an 8gal system. So you use that flushing procedure and at the final drain, you add the 4gals (1/2 the whole system) of ELC and top off with distilled and water and, voila, 50/50 mix.
The only time you can use a 50/50 premix is when the ENTIRE system is 100% bone dry.

[rufushusky]

Originally Posted by adavis11

I have a 99 7.3 and am wanting to change out the coolant. I called ford and they told me to use any 50/50 mix. I just wanted to get a second opinion to see if this is right or if I should be using something else. Also should I be adding a additive to the coolant and what are the intervals the coolant should be changed? Sorry for all the questions.

The link above will answer any question you could possibly think of regarding coolant. The dealership said that cause to many shops draining the radiator and refilling it with 50/50 is a "flush." Which of course is not the way your supposed to do it IMHO.

[Bill Kay]

If you have an Early 99 then DO NOT PUT ELO (extended life coolant) IN IT!!!! You have to use the old style with the SCA additive in it.

[Galaxie]

Originally Posted by Bill Kay

If you have an Early 99 then DO NOT PUT ELO (extended life coolant) IN IT!!!! You have to use the old style with the SCA additive in it.

Why? I am not super familiar with E99s.

[JEL]

Originally Posted by Galaxie

Why? I am not super familiar with E99s.

It can cause the injector cups to start leaking, apparently the sealing materials on the E99 and earlier trucks' injector cups doesn't mix with the OAT technology in the ELC, which is a bummer becuase I'd love to run it.