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Another question about the cooling system

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Old Jan 19, 2019 | 06:49 PM
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Another question about the cooling system

I filled my coolant reservoir between the minimum and maximum line (coolant was a little closer to the minimum line); however, it was well over the max line after i drove somewhere about 45 minutes away (i’d say about 1.5-2 inches over max). The car does not overheat, but does that mean there is still air in the system?
 
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Old Jan 19, 2019 | 11:20 PM
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No, coolant expands as it gets hot, the reservoir exists so the extra volume has somewhere to be stored. As it cools there will be a vacuum siphon effect that draws coolant back into the radiator.
 
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Old Jan 19, 2019 | 11:53 PM
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Originally Posted by cleric670@gmail
No, coolant expands as it gets hot, the reservoir exists so the extra volume has somewhere to be stored. As it cools there will be a vacuum siphon effect that draws coolant back into the radiator.
Sorry, let me illustrate a better picture of how much the coolant has risen to explain this better; if i were to fill the coolant up to the max, the reservoir would basically be full of coolant after driving 45 minutes away to that destination. I do not think coolant should rise that much, but i also do not know what the issue could be
 
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Old Jan 20, 2019 | 12:09 AM
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The reservoir shouldn't be close to full if it's 2 or 3 inches above max. Are you sure you filled it up to the right line? It can be hard to see on a dirty tank
 
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Old Jan 20, 2019 | 12:18 AM
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Originally Posted by FreshLikeAG
The reservoir shouldn't be close to full if it's 2 or 3 inches above max. Are you sure you filled it up to the right line? It can be hard to see on a dirty tank
I was just trying to give him a better picture of how much the coolant has risen. I filled it up slightly above minimum. After i was done driving it was about 2 inches above max. That is probably a 5 inch rise in the reservoir, and I think that is way too high
 
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Old Jan 20, 2019 | 12:20 PM
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Here's the thing though, if the car is NOT overheating and you DO have hot air blowing from the air conditioner then it's working as intended. Yes it seems a little high but there's a lot of variables that go into fluid expansion, glycol expands less than water, perhaps your 50:50 ratio is off and you have too much water in the mix. A coolant tester, the kind where you suck up some coolant out of hte radiator and read the floating gauge, can verify your mix.

If you do have too much water and not enough glycol you can siphon or use a turkey baster to remove coolant from the radiator. Pull out a half gallon and replace with concentrated glycol instead of glycol mix. It's easier than removing stuff to get to the petcock valve on the radiator usually.
 
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Old Jan 26, 2019 | 08:33 AM
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Originally Posted by cleric670@gmail
Here's the thing though, if the car is NOT overheating and you DO have hot air blowing from the air conditioner then it's working as intended. Yes it seems a little high but there's a lot of variables that go into fluid expansion, glycol expands less than water, perhaps your 50:50 ratio is off and you have too much water in the mix. A coolant tester, the kind where you suck up some coolant out of hte radiator and read the floating gauge, can verify your mix.

If you do have too much water and not enough glycol you can siphon or use a turkey baster to remove coolant from the radiator. Pull out a half gallon and replace with concentrated glycol instead of glycol mix. It's easier than removing stuff to get to the petcock valve on the radiator usually.
I am noticing that the coolant is not returning into the radiator. What is the reason for that? I have new cap.
 
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Old Jan 26, 2019 | 01:30 PM
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With a cool engine, take off the cap and see how much fluid is in the radiator, it might just be full.

If it is still low in the radiator, take the single 10mm bolt off of the reservoir and lift it straight up, remove the coolant hose where it connects near the radiator cap. Pour the coolant out into a safe container as you do the net tests. Now tip it to the side and see if you can get coolant to pour from the hose, tip it the other way and see it pours from the overflow.
 
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Old Jan 26, 2019 | 01:44 PM
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Originally Posted by cleric670@gmail
With a cool engine, take off the cap and see how much fluid is in the radiator, it might just be full.

If it is still low in the radiator, take the single 10mm bolt off of the reservoir and lift it straight up, remove the coolant hose where it connects near the radiator cap. Pour the coolant out into a safe container as you do the net tests. Now tip it to the side and see if you can get coolant to pour from the hose, tip it the other way and see it pours from the overflow.
I unbolted it and tilted it to the right and the coolant was going back into the radiator. Heres the thing though. The coolant from the reservoir filled the radiator back up to the neck and the reservoir was back between the min. and max. line where i had it before. So, does that mean i just need new hose and/or radiator? Something is preventing the coolant from going back into the radiator. I already have new cap.
 
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Old Jan 26, 2019 | 02:38 PM
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I would rent a pressure test kit for the coolant system, I think you have a leak, also pressure test the cap to verify it's actually working. It might be escaping as steam so it won't necessarily be dripping.

If the system is not completely sealed then it won't create the vacuum effect needed to draw coolant back from the reservoir.
 
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Old Jan 31, 2019 | 07:18 PM
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Originally Posted by cleric670@gmail
I would rent a pressure test kit for the coolant system, I think you have a leak, also pressure test the cap to verify it's actually working. It might be escaping as steam so it won't necessarily be dripping.

If the system is not completely sealed then it won't create the vacuum effect needed to draw coolant back from the reservoir.
Head gasket. Might as well start on a 2j swap. Thanks, i really appreciate your help
 
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