Mercedes-Benz Forum banner

1 - 20 of 32 Posts

·
Registered
1996 S600 Coupe
Joined
·
192 Posts
Discussion Starter #1
Hi I'm about to upgrade my cooling system before the summer.
I already have a new (2 years) radiator and thermostat.
I will change water pump , my leaking expansion tank, hoses and install an electric fan.

Does the M120 use the same expansion tank as all the smaller engines ?

I want to buy this JP Coolant Expansion Tank Bottle Fits MERCEDES W140 C140 Saloon 1405001749 | eBay

But it doesn't mention 600 in the list of compatible cars.
 

·
Registered
1996 S600 Coupe
Joined
·
192 Posts
Discussion Starter #2
Could someone please tell if a S600 uses the same expansion tank as S500, 400 , 320 ?
My current expansion tank has a bayonet style cap . Will the newer one with screw style cap fit my car?
 

·
Registered
600 coupe, one of the very first built
Joined
·
208 Posts
Could someone please tell if a S600 uses the same expansion tank as S500, 400 , 320 ?
Does this help:


Vehicle Fitment


MakeBody & TrimEngine & Transmission
1993 Mercedes-Benz 300 SEBase3.2L L6 - Gas
1992 Mercedes-Benz 300 SEBase3.2L L6 - Gas
1992 Mercedes-Benz 400 SEBase4.2L V8 - Gas
1993 Mercedes-Benz 400 SELBase4.2L V8 - Gas
1993 Mercedes-Benz 500 SECBase5.0L V8 - Gas
1993 Mercedes-Benz 500 SELBase5.0L V8 - Gas
1992 Mercedes-Benz 500 SELBase5.0L V8 - Gas
1993 Mercedes-Benz 600 SECBase6.0L V12 - Gas
1993 Mercedes-Benz 600 SELBase6.0L V12 - Gas
1992 Mercedes-Benz 600 SELBase6.0L V12 - Gas
1999 Mercedes-Benz CL 500Base5.0L V8 - Gas
1998 Mercedes-Benz CL 500Base5.0L V8 - Gas
1999 Mercedes-Benz CL 600Base6.0L V12 - Gas
1998 Mercedes-Benz CL 600Base6.0L V12 - Gas
1999 Mercedes-Benz S 320LWB, SWB3.2L L6 - Gas
1998 Mercedes-Benz S 320LWB, SWB3.2L L6 - Gas
1997 Mercedes-Benz S 320LWB, SWB3.2L L6 - Gas
1996 Mercedes-Benz S 320LWB, SWB3.2L L6 - Gas
1995 Mercedes-Benz S 320LWB, SWB3.2L L6 - Gas
1994 Mercedes-Benz S 320LWB, SWB3.2L L6 - Gas
1999 Mercedes-Benz S 420Base4.2L V8 - Gas
1998 Mercedes-Benz S 420Base4.2L V8 - Gas
1997 Mercedes-Benz S 420Base4.2L V8 - Gas
1996 Mercedes-Benz S 420Base4.2L V8 - Gas
1995 Mercedes-Benz S 420Base4.2L V8 - Gas
1994 Mercedes-Benz S 420Base4.2L V8 - Gas
1999 Mercedes-Benz S 500Base5.0L V8 - Gas
1998 Mercedes-Benz S 500Base5.0L V8 - Gas
1997 Mercedes-Benz S 500Base5.0L V8 - Gas
1996 Mercedes-Benz S 500Base5.0L V8 - Gas
1995 Mercedes-Benz S 500Base5.0L V8 - Gas
1994 Mercedes-Benz S 500Base5.0L V8 - Gas
1999 Mercedes-Benz S 600Base6.0L V12 - Gas
1998 Mercedes-Benz S 600Base6.0L V12 - Gas
1997 Mercedes-Benz S 600Base6.0L V12 - Gas
1996 Mercedes-Benz S 600Base6.0L V12 - Gas
1995 Mercedes-Benz S 600Base6.0L V12 - Gas
1994 Mercedes-Benz S 600Base6.0L V12 - Gas
 

·
Registered
1994 S600 Coupe, 1995 S600 Coupe
Joined
·
2,009 Posts
Could someone please tell if a S600 uses the same expansion tank as S500, 400 , 320 ?
My current expansion tank has a bayonet style cap . Will the newer one with screw style cap fit my car?
Yes, but you need the new cap also. The late style superceded the early in the parts manual (EPC).

Jon
 

·
Registered
1996 S600 Coupe
Joined
·
192 Posts
Discussion Starter #5
Thanks a lot Timecapsule and jal1224 , weird that many sellers of this expansion tank does not mention 600 under supported vehicles. I will go ahead and order now.
By the way Timecapsule , when was the first 600 coupe made?
 

·
Premium Member
'97 CL600
Joined
·
2,915 Posts
I've got a '97 CL600 and live in the hottest place in the US (except Death Valley). I have NEVER seen my temp over 87C in the hottest, AC using, idling conditions. If you return your cooling system to stock like mine you should have NO problems. I use 50% Benz coolant and 50% distilled water because the car will never be in sub freezing temps. Good luck.
IMG_0202_edited.jpg
 

·
Registered
1996 S600 Coupe
Joined
·
192 Posts
Discussion Starter #7
Beautiful car, nice chrome on those Lorinser wheels. I use about the same ratio of coolant, but slightly more distilled water. I top of missing fluid with distilled water. My expansion tank is leaking from the nipple. My car gets hot really fast when I floor it , like when I drive on a long steep road. And when I coast the needle goes back to normal (87C). I think the water pump have problems keeping up . It's probably never been changed , I take it you have fresh parts in your car?
2621646
 

·
Premium Member
'97 CL600
Joined
·
2,915 Posts
No, everything is original OEM. I finally changed out the 23 year old radiator hoses but inspection found them almost perfect! Other than that, nothing has been renewed except coolant.
 

·
Registered
1994 S600 Coupe, 1995 S600 Coupe
Joined
·
2,009 Posts
Beautiful car, nice chrome on those Lorinser wheels. I use about the same ratio of coolant, but slightly more distilled water. I top of missing fluid with distilled water. My expansion tank is leaking from the nipple. My car gets hot really fast when I floor it , like when I drive on a long steep road. And when I coast the needle goes back to normal (87C). I think the water pump have problems keeping up . It's probably never been changed , I take it you have fresh parts in your car? View attachment 2621646
Pull the radiator. You'll probably find a lot of crap between the a/c condenser and the radiator. Clean it out. Also check to see if your electric fans are both coming on when the car heats up. Your engine driven fan clutch may also be bad.

Jon
 

·
Registered
1996 S600 Coupe
Joined
·
192 Posts
Discussion Starter #10
The radiator was changed 2-3 years ago so I don't think it's that dirty. I never park outside and never drive in bad weather. The electric fans do come on but this overheating problem happens also when I drive fast , the wind should cool it down but it doesn't. The clutch fan is probably worn out, I'm going electric instead. I found a good spot for a thermo switch in the pipe next to the thermostat. I just need to find a good 12v source somewhere under the hood.
 

·
Premium Member
'97 CL600
Joined
·
2,915 Posts
Something is amiss. What about the thermostat or water pump? I was out on the freeway yesterday. Temp in the high 80's. Continual speeds at 80 with hits at 100. Absolutely no increase above 87C.
 

·
Registered
1996 s320
Joined
·
224 Posts
Replace the coolant tank and cap with proper pressure setting. Having a leaky system does not allow it to run at the appropriate pressure and can affect the temperature. I would also replace the pump. 20+ years on a water pump is a long time. The one on my car was replaced at around 140k miles. That was just prior to me purchasing it.
 

·
Registered
600 coupe, one of the very first built
Joined
·
208 Posts
Most US S600s did not get the front oil cooler.
AFAIK, only the 600SEL's got the oil coolers in the US. After that, when they went to S600, some running changes were introduced and one of them was the deletion of this important sub-system.

The OP is in Sweden, I (we) do not know if the Swedish-market coupes had oil-coolers from the factory or not.
 

·
Registered
1996 S600 Coupe
Joined
·
192 Posts
Discussion Starter #16
The thermostat was replaced 2-3 years ago .. so the waterpump is probably the culprit.
My car has a separate oil cooler for the transmission , it's probably factory. Although the car was sold in Germany first.
Don't know about engine oil cooler.. I don't think it has one.

I have ordered a new waterpump and expansion tank . Both "JP Group AS" brand.
I noticed the expansion tank has some loose plastic inside it .. is it a "floater" for the sensor? Or is something broken inside? Is it possible to swap over the sensor and rubber grommet from the old tank or should I buy new ones from the dealer? Thanks
 

·
Registered
1996 s320
Joined
·
224 Posts
More than likely it is the float for the sensor. Its been a while since I took a look at mine so I'm not sure how the sensor is attached and whether it is an integral part of the coolant reservoir. Shine a flashlight into your current tank. If indeed the float has broken off then you will need a new part anyway.
 

·
Registered
600 coupe, one of the very first built
Joined
·
208 Posts
Its been a while since I took a look at mine so I'm not sure how the sensor is attached and whether it is an integral part of the coolant reservoir.

A nice post on the subject "what's inside the coolant tank". Enjoy:

 

·
Registered
1996 S600 Coupe
Joined
·
192 Posts
Discussion Starter #19
Yes a float for the sensor it is , I had no idea it worked that way .. thanks guys!
I forgot to ask , is it necessary to remove the pipe to change water pump ? If so .. does the pipe require new gaskets? I only got one O-ring for the water pump and one gasket for the block.
 

·
Registered
1994 S600 Coupe, 1995 S600 Coupe
Joined
·
2,009 Posts
You can get the pump out without removing the center section, but I don't recommend it. The pipes and elbows get moved around some in the process, disturbing the o-rings which are flattened from age and heat. There is the thermostat o-ring, the o-ring between the thermostat block and the pump, and 2 o-rings between the pipes and elbows, and 2 more between the elbows and the engine. The last 4 are the same size. The thermostat and block o-rings are both different. You don't want to do this job twice because of leaky o-rings.

Jon
 
1 - 20 of 32 Posts
Top