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  #31  
Old 02-07-2002, 10:40 PM
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Does it spike to 100 at random times? or does it do it gradual when your at either a stop light or crusing down the Freeway?

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  #32  
Old 02-07-2002, 10:46 PM
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Hi Capt. Kirk,it seems to be random and not always gradual,but 99% of the time it's normal so I refuse to worry about it.....yet.
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  #33  
Old 02-07-2002, 11:02 PM
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Hehe, I agree that until it's constant you probably don't want to start fiddling with it or else you'll figure out everything needs replacing.


I'd check to see if maybe the waterpump belt is loose and could sometimes slip. (That goes for all y'all)
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1982 300D - Silver/Blue "Ralph" -For Sale:
http://www.peachparts.com/shopforum/showthread.php?p=852260

1989 VW Diesel Jetta Blue/Blue "Bodo" RIP
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  #34  
Old 02-08-2002, 08:50 PM
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Location: Concord, MA
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While driving around town, coolant temps. about 90 C
While driving on highway up to 60 mph, steaty 95 C, intermittent spikes (infrequent) above 100, then back down to 95.
While driving on highway at 65mph and above, steady 105 C.

Above seems to be consistent with small leak in head gasket....at greater engine speeds there is greater heat dispersed into coolant.

dont forget high carbon monoxide levels in coolant reservior ....175ppm!... there is no possible source of carbon monoxide other than combustion gases, and no other way for combustion gases to get into coolant other than head gasket or crack in head. VERY unlikely to be a problem with block, cylinder sleeves and such. Seems to verify head gasket.


Another though about hot coolant temps, and cold radiator....if a head gasket leak is in the vicinity of the coolant temp. sensor...temps in that location will be hot, and much cooler in other areas.


As an aside, yesterday I had a job a Smith College all day....I parked in visitor lot all day...when I returned, I noticed a note on the winshield... I got out to get it, and I saw that someone had pulled into the parking space on my passenger side, dented and knocked off my rear hubcap, and smacked into the body just behind the rear door causing severe damage and knocking of the trim piece!!!!! What the!!! She did leave her name and phone number and said to call, and said "sorry for knocking off your hubcap"!!! Add this project to the list.
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  #35  
Old 02-10-2002, 09:44 AM
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Mark
I feel your pain!!!

I saw a guy do this to a car in a parking lot one time. He smacked a car while pulling out of his space. He stopped, pulled in again-wrote a note and put it into the windshield, and then left without re-hitting the car.

A few moments later the owner of the car showed up and I couldn't resist commiserating with the guy.

He read the note, and here it is-- I kid you not!

"I apologize for bumping your car. For any damage reimbursement, please call me.
Richard. "

He got real red in the face, and I quickly exited the scene before I busted up laughing in his face.

Believe me I know it is not funny getting your car hit, but I had to hand it to this guy for his clever ruse.

So you are very lucky and it is nice to know there are honest folks here in this great country.
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  #36  
Old 08-14-2002, 02:49 PM
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Fan Clutch??

I was just wondering. Has anyone out there changed one component at a time to find the real problem? I have had my 300D since 1985 and the coolant needle used to always hover around 90C. Lately it is starting to move up to 110C on the hottest days and under the heaviest loads on the highway at high speeds. I have purged the radiator and it looks very clean inside. I also replaced the temperature sending unit to the instrument cluster. I still have the same trouble.

I guess I am having a hard time believing that the head gasket would go on an iron block, iron head engine at 300k miles.

From my ponderings in the MB manual, I am heavily suspect of the fan clutch which is supposed to kick in at higher temperatures and allow the fan to spin at higher speeds. I must admit I am afraid of the procedure to attempt to stop it with a glove or towel. Then again....what about the ram air effect? Is a fan really needed at highway speeds?

I still have the original waterpump, radiator, oil cooler, fan clutch..... and I'm wondering if I have to replace them all.

So I guess my question is.........has anyone just replaced the fan clutch to find out that their overheating went away???

Thanks,

Jeff Biesenberger

1984 300D Euro 5-spd 298k miles
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  #37  
Old 08-14-2002, 03:35 PM
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Yes - Mike (myoder), and some other people had problems that were cured by replacing the fan clutch. That was on a 6-cyl OM603 diesel, but the principle is the same. If replacing the clutch doesn't do it, next item I'd check would be the thermostat, followed by the radiator. Water pumps usually leak, they don't stop pumping. Same with your oil cooler, that's not a problem either. On one of my 87's, the fan clutch was bad, and replacing it lowered freeway temps considerably. The answer is YES, the fan IS needed on the freeway, the "ram air" effect is NOT adequate!!!

FWIW, I also have the same car as you but with a turbo engine. It has a 5-year old MB Behr radiator, new thermostat, and new temp sender on the head. It refuses to run above 90C in any conditions. It stays between 87-90C at all times, even when cool out. If you're seeing temps over 100C, you have a problem that needs to be fixed!


Good luck,
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  #38  
Old 08-14-2002, 03:39 PM
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Oh - forgot to mention - you can test the fan clutch. The engine manaul explains a "roar" test. You can also watch the fan when you shut the engine off, when cool, the fan should freewheel a bit after the engine stops. When HOT, and the clutch engaged, the fan should stop right away when the engine quits. If not, it's not engaged.

Someone else mentioned temporarily wiring the fan blade to the pulley, to "force" the fan on at all times. That way you can see if there is a difference in engine temps before shelling out $200+ for a new clutch!

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