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95 Mercedes S320
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Discussion Starter #1 (Edited)
so i don't have the greatest knowledge when it comes to cars but i KNOW something is wrong with something in my car.
-overheating gauge upon a few minutes on idle @ 120 celsius
-new water pump/ serpentine belt/ thermostat (possibly wrong thermostat for the car so i am getting one from mercedes parts)
-left over oil in coolent that wouldn't wash out in my several coolent flushes
-when the car is "hot", the engine is cool, but the water pump is super hot
-my fan blades sound like they run spotty like they are on and off and then on again in a mater of 30 seconds
I've been told that the oil in the coolent can be from a blown head gasket or a bad radiator since a hose connects the two. i don't know if this is correct of not but its a thought. if not, then please let me know. are there any other ways oil could be getting into my coolent without ANY coolent in my oil? also, my engine still overheats on idle ever after a new water pump. it might be the new thermostat but im not sure. my car never ran as hot so easily until my water pump started spewing liquid which is why i bought a new one and replaced it and replaced its gaskets as well. is it really possible for and engine to get "so hot" just because of a little oil in the coolant? it's not even that much oil. and as far as a head gasket goes, i was told i couldn't get much farther than a couple blocks with a bad head gasket and i can drive pretty far and my engine still drives well. my engine even looks super clean so i am just confused....
also, do 95 s320's have ac fan belts?
 

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1997 S500V, 1999 S500 grand edition, 2006 s65 amg
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7,356 Posts
oil and coolant mix is very bad. Smell your oil to see if your headgasket is bad. also the two front fans are not always on. but the one behind the radiator is suppose to be running all the time. the temp should not pass 100. but let me say that the m104 engines have a headgasket issue.

oh yeah forgot to mention the factory mercedes coolant is a brownish-orangish color. double check the thermostat i don't know how you got a wrong one. but the main fan has clutch those also go bad with time.
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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7,639 Posts
The Link below should explain a bit more .Small amount of water & oil mix could be that on the bottom of the radiator there is a valve that cools the steering / AC & or Transmission oil that could have failed ,i forgot what it's called,NHZ above might know more about that .
If your Reservoir tank has a milky look to it inside then get ready for the headgasket .
If the waterpump you got in there and its not the one for your car change that 1st to make sure .
Let's hope it is just a waterpump failure,it can happen,fingers crossed for you . :thumbsup:
What are the signs of a blown head gasket
 

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1997 S500V, 1999 S500 grand edition, 2006 s65 amg
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7,356 Posts
when the headgasket goes it smells horrible. My former m104 had a slight leak never really overheated and oil and coolant was replaced every 5000miles when that problem started.

but as for the smell it might make you feel sick to your stomach. I remember being in my cousin's shop and an 96 sl320 came it a full blown headgasket and my cousin told me to smell it and know what it smells like. trust me if you know what oil and coolant smell like and you smell a bad headgasket you will remember that smell for the rest of your life.

it sort of looks like milky oil. and the fluid isn't see through anymore its cloudy(as they call it in the urine analysis lab).

when what gets into the engine it will need a rebuild(that means water in the intake or engine oil will damage it)

also if your oil sort of smells like fuel that is okay-ish(means you need a new FPR)
 

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95 Mercedes S320
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4 Posts
Discussion Starter #5
is there a difference between standard green coolent used to protect aluminum parts and mercedes coolant? does one work better at cooling the car?
also, i will check up on some information about the fan clutch. so far what i know about it is that if you spin one fan with your hand, the other is supposed to spin as well. :/ mine doesn't do that...i think i need to add a fan belt for my front fans. the fan right in front of my engine works fine though.
i have no loss in power to my engine. the oil does not smell like fuel and the oil has no coolent in it, not even a little. i've had several oil changes since noticing the oil in my coolant and so far, every mechanic has said that my engine oil looks great and you can tell by looking at my engine that i get all of my oil changes regularly.
i never seem the leak coolant from my car which is good but i am curious about
that valve that cools the steering / AC & or Transmission oil at the bottom of my radiator. what could i do to see if it works or not? and is there a way to fix that valve without buying a new radiator?
funny thing is after i recently started doing coolent flushes on my car and changed the water pump and thermostat, my car has only been hotter, not cooler. i've talked to some people at mercedes because of it and they seem to think that the guys at autozone gave me a bad thermostat as well. it's not a mercedes part so i think from here on out, i'd like to use mercedes only stuff. hopefully the new thermostat will make all the difference.
as far as the head gasket thing goes though, i'm not so sure about it. it just doesn't seem right. i feel as if i have something wrong that masks its self as a bad head gasket. my heater being on never smells like rubber and coolent, my engine does not smell, my oil looks great, and i never have loss of power or a rough engine. i just have a feeling that it's not my head gasket. there is no way my engine is even as hot as my car says it is anyways because at "120 degrees celcius," the engine will not burn my hand but my water pump will
 

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W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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Forgive me if i'm wrong lovemywilly but wich fan are you talking about , you should have 2 fans at the front of the engine wich cool the AC radiator and one behind it ,one big metal fan that cools the radiator , that fan should turn almost freely with the engine of if you spin it(dont touch it with the engine on as it will take your hand clean of ) ,the 2 fans in the front come on at a certain interval ,sometimes they come on both together & some other times just 1 & then the other one follows shortly after ,next to or inbetween you should see or have two rectangular white/greyish resistors ,those are for the 2 fans in the front ,those do almost the same function what you find underneat the blower for the heater ,faster slower etc etc .... when to start/turn off & dont use any belt ,that's why the resistors ,you find out that if you leave the car running with the bonnet closed and let the engine sit at idle ,those 2 fans at the front of the engine will come on at about 105c degress heat but they also just slight come on at different stages wich i never figured out ,they stop at 97c on mine on a hot day ,cooling the engine quickly from 105 c .
As for the Coolant ,try to use the MB only but other's have found a similar coolant that is slightly cheaper and does the same thing ,( why go cheaper on something like that to only safe a few dollars ) , Coolant protects or preserves your heads from corrosion and keeps as antifrezze ,if you use the wrong coolant in your engine you could shorten the life of it dramatically ,like alloy heads & steel heads .
Sounds to me that you just need the waterpump there ,make sure its for your model and from MERCEDES , how much is a waterpump ,50 dollars or less ,half an hour work ,the beautifull hours we spent driving our 140's around , i think it deserves it without question .
Another thing i would do since you mention you spotted a little oil in the water is that , i would take the radiator to the radiator specialist and get them to clean it out ,it dosnt cost much if you can get the radiator out yourself ,pretty easy to do .
BTW: Mercedes coolant is ( here ,20$ for 1 litre ) clear in colour other's are green ,end of the day it does the same job but who knows what MB has added in there for there own engines ,thats why i like originallity even with that small detail but big difference to make sure.:thumbsup:
Have a read here just to look ,its a V12 but same thing ,on your engine they just forgot to add the other bank of cylinders in
http://www.w140repair.com/replacing-the-viscous-fan-clutch/

Forgot to mention that Valve , those usually start to slightly leak inside the radiator,it keeps some of the red oil cool that is needed for the Steering & transmission .If you see a redish coloured oil ,you found your problem .
 

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95 Mercedes S320
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Discussion Starter #7
i wish i just had a bad fan clutch but unfortunately, that's not my issue :/ i tried sticking a vaccume hose to the fan clutch and it did nothing. the fan clutch seems to be working fine. the water pump should be fine since i just replaced that....so i really don't know what's wrong with my car! :( it runs at 105 Celsius without the ac on and anywhere between 110 and 120 Celsius with my ac on. from what i understand about the auxiliary fans, they are supposed to kick on if the engine gets hot right? they won't kick on at all unless i turn on my ac and even if i do turn it on, the fans constantly kick on and off. my driver's side fan spins slower than the passenger side fan. i doubt that's supposed to happen but i don't know what to check to fix that. i just can't believe that the ac could make my car that much hotter though...the only thing that i can think of is a correlation between my ac and my temperature problem
 

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1997 S600 (sold)
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4,660 Posts
There is a transmission fluid cooler inside the radiator. It is possible that the cooler inside the radiator has developed a leak and is allowing transmission fluid to leak into the coolant. If this has happened, I would expect it is independent of your water pump change and probably just bad luck that the two failures happened close together. On the other hand if the radiator was removed to do the water pump change, I suppose it's possible that unbolting the banjo bolt connections on the transmission hoses could have affected the cooler integrity. Have you checked your transmission fluid level to see if you're losing fluid?

For your overheating, I would think it's possible that you have clogged some of the passages in the radiator. Typically this can be checked by using an IR thermometer to check the temp of the radiator at different locations. Any cool sections are areas where coolant flow is blocked. But, it's hard to get to the radiator because the entire front of it is blocked by the AC condenser, and the rear is covered by the shroud. I would think it's also possible that the oil in the coolant has coated the inside of the radiator and reduced the efficiency of heat transfer causing hot running. Merc S500's suggestion to have the radiator cleaned out is a good one in my opinion. But, if the transmission oil cooler is leaking, you'll need a new radiator. Don't waste your money on cleaning it. Rule out the transmission oil leak possibility first.

I wouldn't rule out the head gasket. The 320 engine does have a known head gasket problem from the factory; however, my understanding is that once fixed, it is good for a long time, and by now, the factory issue has been fixed on most of these engines, I would think. Others will have to correct me if the head gasket issue is a recurrent problem.

You don't mention when you noticed oil in the coolant. Was it only after the water pump failure?When your water pump failed, did you suffer a serious overheat event, or did you stop driving immediately? If you had a major overheat, you may have compromised the head gasket.

Brett
 

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95 Mercedes S320
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4 Posts
Discussion Starter #9
I have not checked my transmission fluid but at this point, I am pretty sure that I do have a bad cooler valve in my radiator. My radiator recently started up a small leak as well so I plan on replacing it and hopefully, that will be my fix as far as over heating and an oily coolent mixture. If there is any coolent in my transmission fluid, I will clean that out as well and see what happens. I have gone over the fan clutch and had a couple mechanics take a look and they all think that the radiator is the issue. There is an other issue with leaking oil but I know what I have to do to figure out where that is coming from. hopefully it's not so bad. wish me luck! :)
 

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2006 S500 AMG Wifes Rig Hillbilly Girl 02 ML320
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I believe those folks are right about the rad ! I would pull it and either take it to a rad shop and checked or replace with new one! Which I think you are going to end up doing!

Smokie
 
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