After coolant cap fix my radiator blew up! will post pictures soon - Mercedes-Benz Forum
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post #1 of 20 (permalink) Old 07-25-2016, 01:27 AM Thread Starter
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After coolant cap fix my radiator blew up! will post pictures soon

The passenger side of my radiator where it is plastic busted open after driving while i was in park, but the engine did not over heat, i had 30 min to fix it, because i still had to drive. Thank god i had JB steel on me, i sanded the radiator down and filled in the crack, and drove for 3 hours non stop with no issues. Now it is stronger than the original part, but i need to replace the radiator now that i know it is weak. I think i know what is happening, any weak part in the system is failing under extreme driving conditions. After the upper and lower hoses blew a year ago. Then the coolant tank blew, after that the coolant cap failed, & now the radiator. I realized on hot days like 104 Degree temp, running my AC on max, and running my rpm's to 5000 - 5500 when i am in a rush is just way too much for my ML320. She is 18 years old and i can't drive her like she is a Porsche anymore, or like i am in a lethal weapon movie! I also noticed that any time i fill the coolant to the cold line the Ml320 hates it, and something goes wrong. In fact i was having no issues until i decided to fill the coolant to the proper level. it is just strange? Oh yea and having tap water in my system did not help matters either i think?

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post #2 of 20 (permalink) Old 07-25-2016, 01:47 AM
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Sounds like you have a blown head gasket with that mush pressure in the system. Is there bubbles in the coolant tank with the cap off.


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post #3 of 20 (permalink) Old 07-25-2016, 02:04 AM Thread Starter
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Only time my tank bubbles is when the car is turned off and the coolant seems to be pumping back into the tank I think? The head gaskets has been a focus of mine. I took it to a test station to see if there was coolant in my exhaust and it came out negative. Is there any other ways i can check the gaskets that is cheap? But with the cap off the coolant sits their like a pond; no movement at all.

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post #4 of 20 (permalink) Old 07-25-2016, 02:17 AM Thread Starter
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Sounds like you have a blown head gasket with that mush pressure in the system. Is there bubbles in the coolant tank with the cap off.


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Also the only time when my oil is milky is when i add special fluids like when i put sea foam in the engine by adding it directly to the oil. Other than that like as of this very minute the oil is still brown with no milky residue at all.
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post #5 of 20 (permalink) Old 07-25-2016, 03:57 AM Thread Starter
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Update

Update. I was informed that running my AC actually creates more heat in my engine. So when i also am accelerating fast in stop and go traffic on a hot day with the AC running it becomes to much for the system to handle. Especially with 18 year old parts!
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post #6 of 20 (permalink) Old 07-25-2016, 04:34 AM
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After coolant cap fix my radiator blew up! will post pictures soon

Have you checked your engine fan clutch. Your engine may well be overheating if it's not working properly.
Check the function of all your fans to make sure there working.
With your fans working you should be able to run the A/C in any weather. I never turn mine off. Summer or winter.

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post #7 of 20 (permalink) Old 07-25-2016, 05:23 AM Thread Starter
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Have you checked your engine fan clutch. Your engine may well be overheating if it's not working properly.
Check the function of all your fans to make sure there working.
With your fans working you should be able to run the A/C in any weather. I never turn mine off. Summer or winter.

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I am sure i could use a new fan clutch. I did do the spin test with the engine off and the fan clutch does not keep spinning, but it does spin a little. I heard the fan clutch with the car off shouldn't spin past 1 rotation when you spin it by hand. And i need to clean the radiator and the condenser, but i need to remove the AC fans first and i am having a hard time understanding how to do it

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post #8 of 20 (permalink) Old 07-25-2016, 07:32 AM Thread Starter
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These pictures are after the repair, i wish i pulled out my phone when it happened, I put way to much steel clay on, but more is better when it comes to reinforcing the radiator!
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post #9 of 20 (permalink) Old 08-02-2016, 02:40 PM Thread Starter
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After some heavy thinking, i decided to put some 2 in 1 Bar's leak in my Mercedes. I couldn't fix the leak 100% it had a little drip that was small, but it drove me crazy, I went with the weakest stop leak, because i have a microscopic size hole. So far no leak any more! I drove the ML320 very ruff yesterday with AC on and no issues. I am replacing the radiator very soon in fact it is a top priority. The clear liquid is the stop leak the metal liquid is the coolant / anti corrosive. I am running 100% filtered water only. The last thing is i can't replace the radiator until i know for 100% that this is not another issue
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post #10 of 20 (permalink) Old 08-02-2016, 02:55 PM
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Never, ever, EVER put bars leaks in a cooling system. It will clog up your aux. pump and toast your heater core. Seen it many times. It is nothing but sludge.

2005 S430 4Matic 'Morton' W220.183 722.671 Rest in Peace

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