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Old 01-04-2014, 06:01 AM
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Straight coolant

Working on a fleet of 6.0. guy ran straight antifreeze in four of them, been doing it for a few years. all of them that had the straight coolant are having heating problems. Will not give heat at idle on and off heat while driving. changed heater core,thermo,and water pump in one and same problem egr has been deleted in this truck. Any answers?
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Old 01-04-2014, 12:03 PM
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Most coolants are slightly corrosive which us why most manufactuers recomenc a 50/50 mix with distilled water only.

Scale that forms gets eaten and can flake offcoating the heater core and any heatexchangers there may be.
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Old 01-04-2014, 07:34 PM
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Sure sounds like a head gasket issue to me. Testing cooling system pressure or test strips will rule out.
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Old 01-04-2014, 07:36 PM
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Agreed
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Old 01-04-2014, 08:06 PM
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Quote:
Originally Posted by midnite View Post
Working on a fleet of 6.0. guy ran straight antifreeze in four of them, been doing it for a few years. all of them that had the straight coolant are having heating problems. Will not give heat at idle on and off heat while driving. changed heater core,thermo,and water pump in one and same problem egr has been deleted in this truck. Any answers?
He obviously has no clue as to boiling and freezing points of glycol. The reason there's no heat is probably because the glycol has jelled up in these cold temperatures and ain't moving thru the cooling system. Even if it was warm enough to keep it from jelling up 100% is way more thicker than water and much harder to pump around. I use a max of 70/30 glycol to water ratio to get the best cold and hot weather protection. With normal coolant temperatures glycol isn't corrosive but if it is used at 100% strength and isn't moving because its jelled up then you are creating extreme hot spots that are actually breaking down the glycol into corrosive byproducts. Localized overheating in your engine can cause warped heads.


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Last edited by Term3; 01-04-2014 at 08:15 PM.
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