2015 6.2 Coolant Flush
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2015 6.2 Coolant Flush
Hello all,
I'm doing a coolant flush on my 6.2L F-250 Super Duty. Most of the information I've found online seems to be for the diesel models, so I'm left making a lot of guesses. I just want to be sure I don't do anything stupid that could damage the truck, so I’m here looking for advice. Thanks in advance!
Petcock Question:
I’m not sure how to open the radiator petcock, and I’m paranoid about breaking it since it's plastic. I’ve read a few conflicting things:
Refill Process:
I’ve only ever done coolant changes on older trucks—just refill the radiator, run the engine with the cap off, and top off as needed. This 6.2L doesn’t seem to have a traditional radiator cap, just a single cap on the overflow/degas bottle.
Can someone explain the correct way to refill the system on the 6.2L gas engine?
Vacuum Fillers:
I don’t have a vacuum fill tool, but I do have plenty of time to do the job the old-fashioned way. If there’s a reliable way to fill and bleed the system without a vacuum pump, I’d appreciate any tips.
Thanks again for any help!
I'm doing a coolant flush on my 6.2L F-250 Super Duty. Most of the information I've found online seems to be for the diesel models, so I'm left making a lot of guesses. I just want to be sure I don't do anything stupid that could damage the truck, so I’m here looking for advice. Thanks in advance!
Petcock Question:
I’m not sure how to open the radiator petcock, and I’m paranoid about breaking it since it's plastic. I’ve read a few conflicting things:
- Some say to open the petcock, drain the coolant, then remove the lower hose for more complete drainage.
- Others suggest skipping the petcock entirely and just pulling the lower hose.
Refill Process:
I’ve only ever done coolant changes on older trucks—just refill the radiator, run the engine with the cap off, and top off as needed. This 6.2L doesn’t seem to have a traditional radiator cap, just a single cap on the overflow/degas bottle.
Can someone explain the correct way to refill the system on the 6.2L gas engine?
Vacuum Fillers:
I don’t have a vacuum fill tool, but I do have plenty of time to do the job the old-fashioned way. If there’s a reliable way to fill and bleed the system without a vacuum pump, I’d appreciate any tips.
Thanks again for any help!
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To open the petcock I used a 1/4" ratchet with a 6 point socket and carefully opened it and installed a small hose on the nipple above the fitting. Just remove the cap on the tank and let it drain. What came out was clean so I just refilled with 50/50 Motocraft yellow coolant and didn't bother flushing. The yellow stuff is compatible with gold that's in there so that's not a worry mixing them. You will get new protective additives with the new yellow to protect the motor. You will notice the gold antifreeze looks red and the yellow looks green when they mix it makes a odd looking color in the tank. If you trace the hose coming out of the bottom of the tank you will see that it connects to the bottom hose so it freely drains out.
Denny
Denny
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Ah, thanks. I ended up pulling the lower radiator hose, which I believe also drains the radiator. A little over 3 gallons came out.
I filled the system with RO water and drove it for 20 minutes with the heater on full. The second drain looked about half diluted, which makes sense if the system holds a little over 6 gallons. I did one more flush, and the water was looking pretty clear.
Next, I’ll drain that out, confirm the total system capacity, then add 3.5 gallons of concentrate. That should leave me with just over 50% antifreeze.
Probably overkill flushing it that thoroughly—but I’m weird like that. Thanks again
I filled the system with RO water and drove it for 20 minutes with the heater on full. The second drain looked about half diluted, which makes sense if the system holds a little over 6 gallons. I did one more flush, and the water was looking pretty clear.
Next, I’ll drain that out, confirm the total system capacity, then add 3.5 gallons of concentrate. That should leave me with just over 50% antifreeze.
Probably overkill flushing it that thoroughly—but I’m weird like that. Thanks again
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