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Old 03-16-2019, 06:47 PM   #1
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Coolant leaks when I run the engine block heater

I've noticed the coolant leaks whenever I run the engine block heater, but don't notice any lose of coolant otherwise. Any ideas, has anyone heard of this unusual problem?
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Old 03-16-2019, 06:51 PM   #2
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Originally Posted by larliebler View Post
I've noticed the coolant leaks whenever I run the engine block heater, but don't notice any lose of coolant otherwise. Any ideas, has anyone heard of this unusual problem?
AC block heater?

Or aqua hot coolant heater ?
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Old 03-16-2019, 07:05 PM   #3
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are you sure it's coolant, could be condensation maybe
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Old 03-16-2019, 07:06 PM   #4
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AC block heater?

Or aqua hot coolant heater ?
Diesel engine block heater. Around here it's below freezing, so I turn it on the night before I pull out and turn the heater off right before I start the engine.

I have found a small puddle of coolant each time I have used the engine block heater.
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Old 03-16-2019, 07:36 PM   #5
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are you sure it's coolant, could be condensation maybe
It's red in color, and there's plenty of it. Here are two pics on two different occasions.Click image for larger version

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Old 03-16-2019, 07:47 PM   #6
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AC block heater?

Or aqua hot coolant heater ?

Diesel engine block heater. Around here it's below freezing, so I turn it on the night before I pull out and turn the heater off right before I start the engine.
The question was whether is is an electric heater, ie an electric element that you turn on and of by plug/switch/breaker or whether it's part of the Aquahot, which also makes your hot water and cabin heat.
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Old 03-16-2019, 08:17 PM   #7
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The question was whether is is an electric heater, ie an electric element that you turn on and of by plug/switch/breaker or whether it's part of the Aquahot, which also makes your hot water and cabin heat.
I don't have an Aquahot or equivalent. I have two 10 gallon gas/electric water heaters and a conventional propane furnace.
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Old 03-16-2019, 08:27 PM   #8
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So then you have an electric plug in block heater, 120V.

It's a screw in element, a lot like an electric hot water heater. First step is to locate it and see if it's loose.

Looks like a lot of them are behind the fuel filter, directly into the block. No guarantees that's where yours is, but it's a place to start.
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Old 03-16-2019, 09:15 PM   #9
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Well,
So far, you've not stated just WHERE the coolant is leaking from. You've stated it may be related to the operation of the engine block heater but, have you actually laid down and looked at where EXACTLY the coolant is coming from?
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Old 03-16-2019, 09:17 PM   #10
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Am I right that it only leaks when the element is activated? It does not leak if started from cold at above freezing temps? I'd plug it in, let it start dripping, and slide under with a rag and a flashlight.
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Old 03-16-2019, 11:20 PM   #11
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Well,
So far, you've not stated just WHERE the coolant is leaking from. You've stated it may be related to the operation of the engine block heater but, have you actually laid down and looked at where EXACTLY the coolant is coming from?
Scott
I did try to locate where the leak is coming from, but so far I have not able to determine the origin of the leak. I can see it dripping from above when I'm flat on my back but not exactly where it's coming from. I've also tried to eyeball it from the interior hatch, but from that angle I don't see much of anything.
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Old 03-16-2019, 11:24 PM   #12
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Am I right that it only leaks when the element is activated? It does not leak if started from cold at above freezing temps? I'd plug it in, let it start dripping, and slide under with a rag and a flashlight.
Well since I noticed it, it's two for two, both times I have used the heater it has leaked. I'm still monitoring to make sure there is no evidence of it leaking regardless of the heater being used.
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Old 03-16-2019, 11:27 PM   #13
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So then you have an electric plug in block heater, 120V.

It's a screw in element, a lot like an electric hot water heater. First step is to locate it and see if it's loose.

Looks like a lot of them are behind the fuel filter, directly into the block. No guarantees that's where yours is, but it's a place to start.
I'll look some more tomorrow. Thanks for the picture, hopefully I can find it.
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Old 03-17-2019, 11:48 AM   #14
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I'll look some more tomorrow. Thanks for the picture, hopefully I can find it.
So the leak is there even when I don't run the engine block heater, but I still believe running the block heater exacerbates the problem because I have a lot more coolant on the ground.

Tried my best with a flashlight, but just can't see where the leak is originating. I will bring it into the freightliner authorized service center and hope they can find it and fix it on the first attempt. I will post the fix after I get it repaired. Thanks for everyone's input.
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