Proper flush and fill method for main 6.7 radiator

RyanD

New member
Joined
Jun 12, 2014
Messages
235
Reaction score
0
Guys,

Just replaced my secondary radiator, and realized the coolant in the main radiator is 2 years old now (~25K miles). I'd like to flush and fill over the holiday, but was wondering if there was some special technique for these? My proposed method, which I've done on my other vehicales:

Drain truck
refill with distilled water
run truck until hot
drain

Repeat this process until the drain runs mostly clear, then refill with 50/50 and add coolant additive.

Is this an acceptable method or should I be careful about upsetting a true 50/50 mix?
 

Zeb

New member
Joined
Apr 26, 2018
Messages
846
Reaction score
0
Location
Downtown Marrowbone Ky
Factory orange coolant? It’s good for 5 years, or 150,000 miles on the OE fill, then 3 years, or 60,000 miles is the recommended service interval.
 

RyanD

New member
Joined
Jun 12, 2014
Messages
235
Reaction score
0
Yep, factory orange - I should read more closely - thanks!
 

Connor M

Youtube Certified Master Technician
Joined
Oct 12, 2016
Messages
693
Reaction score
6
Location
Masshole
Guys,



Just replaced my secondary radiator, and realized the coolant in the main radiator is 2 years old now (~25K miles). I'd like to flush and fill over the holiday, but was wondering if there was some special technique for these? My proposed method, which I've done on my other vehicales:



Drain truck

refill with distilled water

run truck until hot

drain



Repeat this process until the drain runs mostly clear, then refill with 50/50 and add coolant additive.



Is this an acceptable method or should I be careful about upsetting a true 50/50 mix?



Iirc you can’t just drain it and get it all.

I’ve been dreading doing the coolant in my dad’s truck for that reason.
 

Latest posts

Members online

Top