W124 Weird Noise, Leaking Coolant, and Loud engine noise - Mercedes-Benz Forum
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post #1 of 19 (permalink) Old 06-12-2019, 10:36 PM Thread Starter
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W124 Weird Noise, Leaking Coolant, and Loud engine noise

Please Help I am having so many issues with my beautiful W124, It is going over the 100-degree mark that isn't labeled probably to about like 105 degrees Celsius when in stop n go traffic or at a light. It heats up very quickly. When the engine temp goes over 83-85 degrees Celsius it makes this really loud fan rev noise and the rpms are a lot higher and the car is a lot slower. There is this little leak( I think) under the water pump and I am scared that I have a coolant leak, but my coolant tank looks the same. Now there is this weird pulley noise. Please check the video:

Please help could it be my thermostat?, I have no idea if the fying coolant has ever been flushed. I have read about the cool harness mod, and that it could help but is just a band-aid for the real problems, but I still might do it to be safe after solving this issue. This car is giving me hell i just hope the head gasket doesn't blow in this insanely hot 100 degree cali weather, Please Respond ASAP.
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post #2 of 19 (permalink) Old 06-12-2019, 10:41 PM Thread Starter
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Oh and to add to that my heater doesn't work, maybe cause heater valves stuck or something haven't bothered with it yet. I don't see any leaks or puddles under my car. Also, My differential is leaking, but not on the ground it is just covered in oil. Looks like its leaking at shaft seals maybe, when it was changed a lot came out. I also feel like I'm hearing a hissing noise from my engine. I love this car and interior and exterior is amazing, but it hasn't been serviced that much.
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post #3 of 19 (permalink) Old 06-12-2019, 11:12 PM
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Appears your car needs a thorough service of the cooling system. Hopefully the previous owner didn't have a head gasket problem and pour some "magic" elixer into the system to stop the head gasket issue. Locate a good independent MB shop and have your car attended to. If you truly love your car then show it some love in return. Everything on these cars can be brought back to proper operating order. This and a lot of searching on this forum will help you out. Everything you have mentioned has been addressed many times over the years. Good luck with your adventure.


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post #4 of 19 (permalink) Old 06-13-2019, 02:39 AM
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I would put a copper pipe - bend - in to the heater pipes that go up to the heater mono valve so coolant returns to the catch tank rather than circulation being cut off by a faulty mono valve or faulty heater controls .Any thought on this guys ?

This is a retro ride .
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post #5 of 19 (permalink) Old 06-13-2019, 08:00 AM
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man, you take lousy videos.

WHen it gets to about 105, the electric fans are supposed to kick in.

Are they doing that?

If there's a tiny leak under your water pump, and it's making a racket, it most likely is your water pump.

Get it pressure-tested.

If you are getting no heat out of your heater, either you're low on coolant, a big huge air bubble in the system, or the water pump is not doing its job and circulating water.
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post #6 of 19 (permalink) Old 06-13-2019, 08:25 AM Thread Starter
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Yeah, the fans do that.
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post #7 of 19 (permalink) Old 06-13-2019, 08:26 AM Thread Starter
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I'll try some stuff, what if my heater isn't working because of the heater valve assembly.
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post #8 of 19 (permalink) Old 06-13-2019, 08:54 AM Thread Starter
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The previous owner happened to be my grandpa and he passed away a while ago, so my grandma started driving the car, I know for a fact he didn't work on it, just took it to the local Benz stealership. It got it's oil changes on time and whatever they said to do, I went to the stealership and asked them to print all the work they have done, I read through everything no mention of cooling system work. Just some brakes and fluids topped off at like 30,000 miles fuel pumps were done, they said wiring harness was cracked a while ago and in 2017 diagnosed the car on two seperate occasions for a data malfunction code 17 cel, and told me 02 sensor was bad, after hours of research I changed eco-junk harness and throttle body, and recently isc/cc module not a cel since. The only mention of the cooling system was in 2010 and they said radiator and water pump look brand new! So idk, and sorry for the bad video, I just want to help my daily driver without pouring money into it, I also want to do most the simple work to save lots of money like an ac recharge, thermostat, and a very deserved coolant flush, silly question can I do a coolant flush on my sloped driveway without jacks??? I also pray that head gasket doesn't blow.
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post #9 of 19 (permalink) Old 06-16-2019, 04:38 PM Thread Starter
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Quote:
Originally Posted by Robert Kyle View Post

If you are getting no heat out of your heater, either you're low on coolant, a big huge air bubble in the system, or the water pump is not doing its job and circulating water.
Could my heater valve also be bad, because I turned the heater on after a long drive, and the heater valve itself got hot, but the heater lines coming out of it were cool to the touch, I proceeded to whack the life out of it with the rubber end of my screwdriver and my heater started working for like 30 seconds and went back to blowing cold air.
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post #10 of 19 (permalink) Old 06-18-2019, 08:23 AM
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Sure, change the heater valve first.

It's possible the blockage is causing overheating; not sure.

You're not low on coolant? You got the right pressure cap on the reservoir tank? No cheap Stant crap?

The "really loud fan rev noise.." is probably your electric fans kicking in, which is supposed to at 105C.

Definitely try to trace that coolant leak. Could be a simple hose, could be water pump, or worst case scenario, head gasket leak.
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