Random Overheating, What’s The Issue?? - Mercedes Benz SLK Forum

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#1 Old 2 Weeks Ago
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Exclamation Random Overheating, What’s The Issue??

Hi all, happy weekend to everybody.

A day or two ago I posted about my coolant light coming on and blinking randomly throughout my drives despite being topped off with the correct fluid. Yesterday as I was driving, A/C full blast in this So Cal weather, I noticed my temp needle creeping upwards.

I gave it 2-3 seconds to come back down but it didn’t, went over 100c and I immediately pulled over, coolant gushing all over the place. Mind you, I have replaced the radiator, thermostat, coolant temp sensor, coolant level sensor and even the belt so this was a surprise.

The past few days I have noticed a weird whistling/winding noise coming from the engine bay that has come on 2-3 times during my drives. The noise will probably last 3-4 seconds but I have never heard it before, even with the noise the car felt and drove fine.

As soon as I pulled over I let it cool down for about 30 mins, then drove to the closest Autozone to buy Blue’s European Coolant. Filled up the reservoir and drove again, however the temps went up high again so I pulled over and let it rest for another 30-45 mins. Topped off again and made it home. (Damn So Cal weather ad traffic doesn’t help). I also drove it later that night, for an hour or two, it was probably 75 degrees outside and the engine temp was perfect, no coolant light or overheating but then again I wasn’t in traffic like earlier, didn’t have A/C on and was much cooler than earlier.

I suspect it is my water pump and bought one online yesterday just because it wouldn’t hurt to replace it. But does anyone have any guesses as to what it may be? Any personal experiences with water pumps? I would love to hear what other have to say.

Thanks!
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#2 Old 2 Weeks Ago
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thermostat...replace...


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#3 Old 2 Weeks Ago
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thermostat...replace...
Hmm I replaced it within the past 4-5 months, at the same time I replaced my radiator.
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Originally Posted by ktarque2 View Post
Hmm I replaced it within the past 4-5 months, at the same time I replaced my radiator.
The Dr did not see it in your list of symptoms in post 1, unless I missed it

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#5 Old 2 Weeks Ago
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Yes symptoms seem to indicate low coolant flow. Since you already have the pump replace that and see if problem persists.
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Coolant gushing all over the place? From where? If you are losing coolant, the engine will overheat.

The noise you are hearing might be the fan. The SLK only has one fan, for the radiator, and it makes a lot of noise. If the water pump is bad, a screeching belt might be the noise you are hearing due to a stuck WP.

To check the thermostat, remove it and see what happens. A stuck closed thermostat will cause the engine to overheat. Stuck open will cause the engine to run cold.

What's a coolant light? I'm not aware of this instrumentation on the SLK! Blinking anything indicates an intermittent problem.

Anyway strange noises are easy to find if you have an engine stethoscope. You just play engine doctor!
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Originally Posted by Wild Bill View Post
Coolant gushing all over the place? From where? If you are losing coolant, the engine will overheat.

The noise you are hearing might be the fan. The SLK only has one fan, for the radiator, and it makes a lot of noise. If the water pump is bad, a screeching belt might be the noise you are hearing due to a stuck WP.

To check the thermostat, remove it and see what happens. A stuck closed thermostat will cause the engine to overheat. Stuck open will cause the engine to run cold.

What's a coolant light? I'm not aware of this instrumentation on the SLK! Blinking anything indicates an intermittent problem.

Anyway strange noises are easy to find if you have an engine stethoscope. You just play engine doctor!
Coolant Light = Low Coolant Warning. I’ve replaced the thermostat a handful of months ago but will check to make sure its not that. The fan is connected and runs well, makes the same sound since I purchased it so don’t think it is the fan but will also triple check.
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it is fairly difficult to "burp" these engines.. if there is an air pocket, it will do just as you say. also, every time it gushes out, that is usually air trying to escape. usually once it does that, it allows more air in as well.

do your water pump again, then take extra effort in burping it, make sure the heater is on when you do this.
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I guess the coolant is rushing out the radiator cap? These keep about 15 pound pressure on the system, so this is a clear sign of blockage somewhere. Check for a collapsed radiator hose. Do you have the heater circuit on? If possible run your hand over the radiator checking for cold spots or blockage.

I suppose air pockets could be the problem, but they usually disappear after running the engine for a while. Try running it stationary with the cap off.
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Intermittently seizing/sticking water pump pulley bearing?
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What type of thermostat do you have, mechanical or electronic? Is it opening? Does the radiator fan come on as the engine heats up? Does the WP impeller turn? Have you examined the radiator hoses? Some of them have double walls where the inside wall collapses blocking the flow of coolant.

If possible, I'd remove the thermostat and see what happens. Examine the following:

https://www.google.com/search?q=how+...QsAVUcM:&vet=1

Water "gushing" out of the coolant expansion tank is due to it being extremely hot and looking for a place to expand or let off steam. This could be caused by a bad water pump not circulating the coolant, a radiator fan not coming on, a thermostat stuck closed, a collapsed radiator hose, plugged radiator, or God knows what!

I'd open up the heater circuit and take out the thermostat and see what happens.
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And BTW, when you find out what the problem was, make sure you let us know. In that way, the knowledge base expands.
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Originally Posted by Wild Bill View Post
And BTW, when you find out what the problem was, make sure you let us know. In that way, the knowledge base expands.
Will do, love the advice. Am currently waiting on water pump to arrive so I can try that out and will report back.
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Have you tried taking the serpentine belt off and spinning the water pump impeller by hand? That will tell you a lot.
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Knew a guy with a 67 Mustang that had similar symptoms, and he replaced everything several times. Turned out to be a weak spring on the radiator cap, it wasn't holding pressure.



Hope this helps.
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A worn water pump with give you those symptoms. If you have an infrared gun, you may want to check temps of both heads, bottom and top of radiator, etc. A head gasket starting to go can also create this problem.
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#17 Old 1 Week Ago
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UPDATE On Suspected Failing Water Pump

Hi all, I recently posted about my 2001 SLK 320 overheating after replacing a handful of parts. I suspected it was the water pump after hearing some light screeching and intermittent overheating, plus I was losing coolant.

Well my water pump comes in on Monday so until then I cant guarantee that’s what it is however I did take a video after a drive I had. Take a look at it and tell me what you see. Click on the link to see it.

Ps. Notice the dripping

https://streamable.com/t53kj
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Water pump bearing seal


EDIT:

Going to 7:55 might explain what's going on

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#19 Old 1 Week Ago
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Agreed with @M4rCu5 ,

Water Pump Leaking, I'm certain it must be making a rattling / rumbling noise judging by the severity of the leak

HTH, Cheers Dave
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Hi everyone, another big update. Today my water pump will be arriving so I went ahead and removed my water pump just to get a head start. A couple people mentioned it was the bearing seal within the pump and I agree. A steady drip from the pump is where its losing coolant.

I removed the pump and noticed there was residue within the pump, unsure if this is normal. I have seen other water pumps be removed and the inside looked clean with no residue. Also, if you look at the pump itself you can see where the spinner (opposite side of pulley, cant think of the name) has grinded into the metal, which was making the noise I was hearing. You can feel some play with the pulley itself and also hear a rattling which appears to be a loose metal o-ring inside the assembly.

Is that residue bad?

Feel free to look at the photos below.
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