lets revisit overheating om603... - Page 5 - PeachParts Mercedes-Benz Forum

Brian Carlton · #61 05-01-2009, 11:49 PM

Quote:

Originally Posted by a2t

i heart u, brian.

still kinda wierd, i will check in morning to see if it looks normal...

In the morning, the upper hose will be soft and slightly collapsed. When you open the expansion tank, air will rush into the tank, momentarily.

dieseldiehard · #62 05-02-2009, 12:03 AM

Quote:

Originally Posted by a2t

But I can use the newer E300 98-99 fan clutch with the old metal fan, right? For sake of not spending too much $ Id like to stick with metal fan, it should do fine (if it fits the clutch)

I know the clutch wont see high temp if rad blocked but i shot the rad with IR gun best I could tell it wasnt blocked. To get rad out and clean, might as well replace fan clutch at same time, its got 286k on it.

I removed it couple years ago to RR water pump, I wonder if I didnt install it right (bolt tight). Will find out...

Well, I am pretty certain the metal fan is not the right internal dia or the screw holes do not lie up on the newer clutch. The new fan is pretty cheap as I recall. The BOLTS ARE DIFFERENT though, you'll need to get them from the dealer if you didn't already.
The thermo clutch for the metal fan is a lot more expensive then the newer style clutch
And I guess I agree that if the radiator is blocked the diagnostic on the thermo clutch would be flawed.
As I said before, if the radiator is over something like say 8 years I would consider it highly questionable, probably partially plugged and in need of a acid flush, or what I generally do is just replace them -

Abadjay · #63 05-02-2009, 12:05 AM

What if....

The car is at 119C and you're on the hill....

What do you do? Pull over with the engine on? Turn it off? Spray with water?

Bio300TDTdriver · #64 05-02-2009, 12:11 AM

Quote:

Originally Posted by Abadjay

What if....

The car is at 119C and you're on the hill....

What do you do? Pull over with the engine on? Turn it off? Spray with water?

At 115 I would pull over and the AC would be off and the heat would be on FULL with the engine running.

JonL · #65 05-02-2009, 03:09 AM

Quote:

Originally Posted by a2t

hmm I just noticed the upper rad hose is flat 5hrs after shut down, like its got vacuum in it. wonder what that means...

It means your pressure cap isn't working properly. It should vent and not allow a vacuum in the system. It should only hold positive pressure (up to its rating), not negative.

a2t · #66 05-03-2009, 10:28 PM

pressure cap is new from dealer.

it was like brian said, hose was normal in morning so im not worrying about that.

so.........you guys are saying my new 98-99 e300 fan clutch WONT fit my 87 metal fan? i was planning to re-use existing bolts with the 87 metal fan - you'd only need new bolts if using newer style plastic fan, right?. i'd really hate to get in there and find i DO need the plastic late model fan and bolts. I need this car for a 250 mile trip on Sat. I dont want to take it all apart and have it waiting on more parts.

Bio300TDTdriver · #67 05-03-2009, 10:58 PM

It may fit, but every thread I've read about using the 606 clutch also mentions using the new plastic fan.

a2t · #68 05-04-2009, 06:41 PM

shizzzz

i will post a new thread asking specifically if it will fit. i thought i found it somewhere on here ppl saying it was drop in fit w/old metal fan. nnow i cant find it.

benz dealer says no, ken at the benz store says no, gsxr says he doesnt know. maybe ill just buy plastic fan and return it if i dont need it.

JonL · #69 05-04-2009, 08:32 PM

Quote:

Originally Posted by a2t

pressure cap is new from dealer.

it was like brian said, hose was normal in morning so im not worrying about that.

IMO, a hose should not ever collapse, but I do not think it is contributing to your cooling problems.

Bio300TDTdriver · #70 05-30-2009, 11:43 AM

Quote:

Originally Posted by Brian Carlton

Are you willing to spend 3 hours work with a decent (but not 100%) chance of lowering the temps by 10°C?

I am. What is the steel tube that runs on top of the radiator and is threaded into the radiator? Can I just unscrew it to remove the radiator?

Never mind, they appear to be oil cooler lines. They need to come off to remove it, so they are coming off.

Brian Carlton · #71 05-30-2009, 03:18 PM

Quote:

Originally Posted by Bio300TDTdriver

Never mind, they appear to be oil cooler lines. They need to come off to remove it, so they are coming off.

Yes, they are oil cooler lines. But, you do not need to remove them as you're going to leave the oil cooler in the vehicle. There is a clip and a nut and bolt at the top of the radiator and at the bottom. Remove the nut and bolt from both locations and the oil cooler will now be free of the radiator.

Bio300TDTdriver · #72 05-30-2009, 03:44 PM

Quote:

Originally Posted by Brian Carlton

Yes, they are oil cooler lines. But, you do not need to remove them as you're going to leave the oil cooler in the vehicle. There is a clip and a nut and bolt at the top of the radiator and at the bottom. Remove the nut and bolt from both locations and the oil cooler will now be free of the radiator.

Upon further review they are transmission cooler lines. They had red fluid in them as well as in a separate chamber in the radiator. They did go into the radiator. The oil cooler is a separate unit down and to the left of the radiator (if you were sitting in the car).

Any reason I can't clean the fan clutch as well? It is pretty gunked up for being 3.5 years old.

Brian Carlton · #73 05-30-2009, 04:57 PM

Quote:

Originally Posted by Bio300TDTdriver

Upon further review they are transmission cooler lines. They had red fluid in them as well as in a separate chamber in the radiator. They did go into the radiator. The oil cooler is a separate unit down and to the left of the radiator (if you were sitting in the car).

Any reason I can't clean the fan clutch as well? It is pretty gunked up for being 3.5 years old.

Agreed.

Perfect time to do it.........

Bio300TDTdriver · #74 05-30-2009, 05:38 PM

Do all OM603's have a transmission cooler in the radiator?

The last picture is the radiator held up to the sun, before cleaning. I didn't see much dirt, as I power washed the radiator and condenser in place a couple years ago. What did surprise me was all the crud on the clutch.

Also, the water I flushed through the radiator came out clear. It is a Nissens so I know it is not original, but it is at least 4 years old.

Bio300TDTdriver · #75 05-30-2009, 11:17 PM

Still no lock up of the clutch after cleaning. Anyone got the 606 clutch number handy?

I took it up a hill with the AC on. 100 on the dash at the top. Pulled over and scanned the 50 degree switch to soften cold shifts 98 degrees. Shot the middle of the radiator 95 degrees. So I think the clutch must not work. I have the radiator and condeser pretty damn clean.

By the time I got to the bottom of the hill the dash gauge read 83 degrees. Home in the driveway dash gauge at 85, center of radiator at 75.

Anyone have any ideas besides that I need a new fan clutch?