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Re: Any Partial Coolant Drain Advocates ? [Re: doitmyself] #5386051 03/26/20 09:58 AM
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ChrisD46 Offline OP
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*Great Info !
Originally Posted by doitmyself
Originally Posted by FordCapriDriver
Now what do we exactly mean by partial drain.

On nearly all vehicles approximately 1/2 of the coolant is in the radiator/overflow tank and the other 1/2 is in the engine block. Most here refer to a partial drain as draining and replacing the 1/2 that is in the radiator/overflow tank only. Because today's coolants keep the systems so clean, it is felt unnecessary to do an entire coolant flush. It's similar to just doing a pan drop and refill on a transmission, where 1/2 (+/-) of the old fluid remains in the torque converter, etc..

The logic of the partial drain done more often is that it is just so easy to drain and refill the radiator compared to attempting to flush out the entire engine. And again, we just don't seem to see the crud buildup in cooling systems with the newer coolants like we did several decades ago. Save the complete fluid exchange for neglected systems or when changing coolant types.


'17 Hyundai Sonata 2.4L GDI 5W30 PUP / Fram Ultra #9688
'10 Hyundai Elantra 2.0L 5W30 (50%) / 5W20 (50%) QSUD / Fram Ultra #9688
'07 Kia Sedona 3.8L 5W30 Castrol EP / Fram Ultra #9999
Re: Any Partial Coolant Drain Advocates ? [Re: ChrisD46] #5390092 03/31/20 10:33 AM
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Propflux01 Offline
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By draining the radiator, are you not draining the block as well, considering the lower radiator hose gets drained along with the radiator, and the lower hose drains what’s in the block? Seems to me the only thing that should be left is maybe what’s in the heater core, and the top hose at the thermostat.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: Any Partial Coolant Drain Advocates ? [Re: ChrisD46] #5390129 03/31/20 11:37 AM
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Olas Offline
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partial drains are very uncomfortable.
cooling systems probably don't mind as much as we do

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