2012 Mustang GT radiator coolant change is easy if you know what to do. This procedure should be the same for all 2011- 2014 Mustang GT. If you are going to just do a partial drain and fill (just drain radiator and coolant reservoir tank) you will need one jug of Ford orange specialty radiator coolant for 2011- 2014 Mustang GT and one jug of distilled water, use only a 50/50 mix. If going to drain and fill the whole system, you will need 13 Quarts or 12.3L of the orange specialty coolant and again mix it with only a 50/50 mix of coolant and distilled water. Do not rush this job, take your time as mistakes can be very messy.
Steps To Partially Drain The Radiator Coolant:
If draining complete system, just remove bottom radiator hose, start engine over for a second or two most all fluid will drain out. This is the fastest way to do it, but it is messy, or can follow drain procedure in Ford repair manual)
1-Jack up front of vehicle just enough so can easily get to underneath radiator area.
2-Remove plastic covering under radiator area (about 10 screws), to allow easy access to radiator drain petcock.
3-Attach a rubber hose to petcock nipple located on bottom of radiator passenger side of the Mustang, to easily direct the draining coolant into a pan or bucket.
4-Remove radiator coolant reservoir tank cap, then open radiator petcock. Petcock should be easily to open by just turning it by hand, do not use any tools to turn it unless absolutely necessary, it breaks easily! Open the petcock a few turns to allow the radiator fluid to start drain into your pan until stops draining. This will have completely drained the radiator and coolant reservoir tank. If desire to drain out more fluid, just start engine for a second and more coolant to continue to drain.
Steps To Fill System With Radiator Coolant:
1-Close radiator petcock, just tighten up good by hand only, do not tighten using any tools as is not needed, petcock seals easily by an o-ring. If petcock ever leaks, you need to replace the rubber o-ring. Make sure if removed any radiator hoses to put back on securely.
2- Pour your 50/50 mix of coolant and distilled water into the coolant reservoir tank until fills just below the top fill area. Start the vehicle with coolant reservoir tank lid off and turn your heater on full. As vehicle is running, watch the coolant tank level and add some coolant as it goes down. When coolant does not go down anymore, put the coolant reservoir tank lid back on and continue letting the vehicle warm up until top radiator hose is warm/hot, which means the thermostat is now open and coolant is circulating. Let run for a while, coolant level should go down once again. Turn vehicle off and let the coolant get cool enough, so can safely remove coolant reservoir tank cap to add more coolant to top fill line.
3-Gently squeeze the top and bottom radiator hoses to burp out trapped air in system. Coolant may go down again, so fill again to fill line. Do this hose squeezing procedure a few times until coolant level does not go down, then put coolant reservoir tank cap back on.
4-Now you need to go and drive your Mustang for about 15 minutes or so, to circulate the coolant through system which will most likely cause the coolant level in reservoir tank to drop again. When done driving, let all coolant cool down until safely can remove reservoir tank cap, add more coolant if need to bottom fill line or little over. You may have to do this procedure a few times, as when the coolant completely cools, I noticed I had to add more coolant to completely fill system.
Take note of how much coolant was drained out, as the same amount of coolant should have been added back into the system. If you take your and work steadily, this radiator coolant change on 2011- 2014 Mustang GT should take you about 1-2 hours.
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