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Old 10-16-2015, 12:03 PM   #1 (permalink)
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OK, so I was working on the car, and had drained the coolant out for the work. I replaced it from what I THOUGHT was my 75/25 bottle of coolant that I made, but it turns out, it was pure antizfreeze. Needless to say, that shit boiled off really quick, halfway to Kansas City. I drove about 5-7 miles on it from when I noticed the burning rubber smell, then promptly pulled over and popped the hood, to find EVERYTHING steaming/smoking. Took off the oil cap, it was even smoking in there.

Long story short, I towed it home, let it cool off and replaced the following:

-Oil and Oil Filter
-Coolant
-Thermostat
-Coolant Reservoir (there was a hole in the cap, where most of the coolant boiled out)

The car starts and runs fine, and I didn't see any metal shavings in the oil when I drained it. Is there anything else I should check before I call it safe to drive again?
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Old 10-16-2015, 12:30 PM   #2 (permalink)
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Default Re: Overheat Damage Checklist

Depending on how long you were driving while overheating, you may have warped your heads. Do everything properly and see if you overheat again or lose coolant. If not, consider yourself lucky!

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Old 10-16-2015, 12:33 PM   #3 (permalink)
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What else is there that I should do? Not sure what else to check, as everything seems alright?

There was also no cross contamination between the oil and coolant too. Forgot to mention that.
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Old 10-16-2015, 12:57 PM   #4 (permalink)
It's a dry heat!
 
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Make sure you get all the air bled out of the system and fans kick in.
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It's a dry heat..like a convection oven.
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Old 10-16-2015, 01:19 PM   #5 (permalink)
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Default Re: Overheat Damage Checklist

weird, so running pure antifreeze (100% antifreeze) will boil over?
I thought that only running pure water (100% water) will boil over.
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Old 10-16-2015, 01:34 PM   #6 (permalink)
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Default Re: Overheat Damage Checklist

Fans definitely kick on, and I burped the hoses, and I'm letting it cool, and then I'll put in more coolant.

If memory serves, pure antifreeze actually has a lower boiling temp than water.

EDIT: Let me clarify the immediate above statement- the higher viscosity and features of ethylene glycol make the exchange of heat far lower than water for transport of the energy away from the motor. In turn, the motor heats up, and eventually the antifreeze is forced to follow suit. The more correct term is antifreeze has a lower boiing point IN PRACTICE compared to water in the pressurized cooling system. Technically though, it has a higher boiling point than water, but for the application, it boils faster.

Can anyone proof me on that?

Last edited by Hackurs; 10-16-2015 at 01:41 PM.
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Old 10-16-2015, 02:22 PM   #7 (permalink)
It's a dry heat!
 
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The more antifreeze the hotter they run, tested it many times in the 70s. Just get premix or run 50/50 with non mineral water.
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Old 10-16-2015, 02:24 PM   #8 (permalink)
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Default Re: Overheat Damage Checklist

Quote:
Originally Posted by Hackurs View Post
Fans definitely kick on, and I burped the hoses, and I'm letting it cool, and then I'll put in more coolant.

If memory serves, pure antifreeze actually has a lower boiling temp than water.

EDIT: Let me clarify the immediate above statement- the higher viscosity and features of ethylene glycol make the exchange of heat far lower than water for transport of the energy away from the motor. In turn, the motor heats up, and eventually the antifreeze is forced to follow suit. The more correct term is antifreeze has a lower boiing point IN PRACTICE compared to water in the pressurized cooling system. Technically though, it has a higher boiling point than water, but for the application, it boils faster.

Can anyone proof me on that?
I believe you are correct. It has a lower freezing point BUT also a lower boiling point IN PRACTICE. it doesn't have the same heat exchange properties as Distilled Water.

68WM6
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Old 10-16-2015, 03:47 PM   #9 (permalink)
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Default Re: Overheat Damage Checklist

good article here--> Things you should know about coolant | hellafunctional

essentially running 100% antifreeze does not reduce the boiling point, rather it greatly reduces the heat transfer capability. This, in theory would then cause the car to overheat.
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Old 10-16-2015, 04:32 PM   #10 (permalink)
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Default Re: Overheat Damage Checklist

Quote:
Originally Posted by gawdzinner View Post
good article here--> Things you should know about coolant | hellafunctional

essentially running 100% antifreeze does not reduce the boiling point, rather it greatly reduces the heat transfer capability. This, in theory would then cause the car to overheat.
Technically, it'll boil over first, THEN the car will overheat, but yes, that's basically what I was saying when I clarified 'lowering boiling point'.

Speaking of boiling over, I just tested the car out. It starts up, seems to run fine, but something happens that I don't understand. The coolant temp sensor reads no higher than 182*, but the coolant is boiling over and out of the reservoir, along with lots of steam. Now granted, the reservoir IS way overfull. Like, to the brim overfull. But I can also hear a popping from the coolant cap, and small drops of coolant escape around the seal. So what is faulty? The temp sensor, or some other part on the coolant system? doesnt make sense. The rest of the motor seems to be functioning just fine, but I don't have a way to read the oil or EGT, so I don't really have any other way to measure the temp of the motor.

Or is that boiling over normal due to excessive coolant?
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