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#76
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Quote:
If you are grasping this concept, then you'll realize that you cannot take photo of the surface of the radiator and expect to obtain any valuable data from it. The problem is between the fins. Hold the radiator up to the sun and peer up between the fins and see if you can discern any debris that blocks the airflow. It will be immediately obvious if you can see straight though the fins or whether the fins are partially blocked due to fine debris (likely). So, just forget the photo and perform the task as recommended and report back with your results. |
#77
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Problem Finally Solved
Well its been a while since I had the overheating problem. It's been cool or cold here in Canada so I haven't had the problem all winter long. (Makes sense.)
Well as sping has arrived, so has the warmer weather and the problem is back. A brief history:
Well, at the shop they replaced the thermostat again. Finally, they looked at the radiator. When the car was hot, 3/4 of the radiator was "ice cold". It looked like there was a coolant flow problem. They pulled the radiator opened it up and tried to fix the flow. Ended up changing the rad. All's fine now. Temp. barely goes above 80 now. Even under stress in the warmer weather, the aux fan doesn't have to kick in and the temp remains constant. Brian was right...I needed to check the rad. I hope this helps others. Thanks to everyone on the forums for their assistance. Brad,.
__________________
Dr. Brad 2003 C320 4Matic Station Wagon 2002 C240 Elegance 1982 380 SEL Star Certified |
#78
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Quote:
Glad you fixed it!
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#79
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My forgiveness...
Hats off to Hatty for recognizing that indeed it was the rad. Replaced as Hatty suggested.... Sorry...
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Dr. Brad 2003 C320 4Matic Station Wagon 2002 C240 Elegance 1982 380 SEL Star Certified |
#80
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I'm just messing with you, I couldn't resist!
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#81
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No need to forgive him...........I taught him everything that he knows..........
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#82
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I was waiting for you to chime in.
I still beat you to it, post 17. You beat me like 500 other times, but I got you once!
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#83
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You did.......and I'm proud of you.......
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#84
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Replaced radiator, temp still climbs on hill
Hi All,
I've been following this thread since I have similar symptoms on my 1987 300TD. Recently, the temp has started climbing on hills. By flooring it going up a long hill I was able to get it to just touch 100 degrees C. The temp drops almost as soon as I crest the hill. I took it to my mechanic. Since the radiator was original with the car, we assumed it was probably due to that and he replaced it with factory-new. Sadly, as I drove home last light, it climbed near 100 again just going up a bridge (the Kosciusko on the BQE for those who know NY's outer boroughs). For nearly a year, the temp gauge has sat just above 80 and wouldn't move to matter what. I'd like to check out the water pump as suggested in another post but I'm afraid I don't know what the water pump looks like. Could anyone describe where in the engine bay it would be? Thanks for any suggestions Tim |
#85
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Doesn't sound like much of a mechanic.
Assuming this model has a clutched fan, that would be my first point to review. Don't think waterpump is issue since the engine cool immediately when load is reduced. Other option is stuck tstat- i.e. open to position that will only allow normal temp when engine is operating at moderate load. Tstat determine minimum operating temp when under low loads, but if got stuck partially open could account for the issue. Ask the mechanic for your money back - last I checked, radiators are expensive, too! Wait - it is actually the most expensive component of the cooling system - now I get it!
__________________
George Stephenson 1991 350 SDL (200K and she ain't bent, yet) former 2002 E320 4Matic Wagon - good car former 1985 300 CD - great car former 1981 300 TD - good car former 1972 280 SEL - not so good car a couple of those diesel Rabbits ...40-45 mpg |
#86
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Thanks, I'll check the fan later today.
How could I tell if the thermostat is stuck? Thanks Tim |
#87
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Check fan first, then replace tstat if that isn't the problem ...
__________________
George Stephenson 1991 350 SDL (200K and she ain't bent, yet) former 2002 E320 4Matic Wagon - good car former 1985 300 CD - great car former 1981 300 TD - good car former 1972 280 SEL - not so good car a couple of those diesel Rabbits ...40-45 mpg |
#88
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Your cooling fan isn't locking up. The clutch probably leaked out all the oil.
When you shut the car down the fan should stop really fast, if it keeps spinning its dead. With those symptoms the radiator is the logical place to start, since it was original replacing it was a good idea. It probably would have failed soon anyway.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#89
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Hey,
I drove the car for about 15 minutes. It was a hot day, almost 90 Fahrenheit. The temp gauge was showing about midway between 80 and 100. I stopped the engine. The belt stopped immediately but the fan behind the radiator continued to spin freely for about 3 or 4 seconds afterwards. The fan in front of the radiator was not moving when the car was idling. Does this indicate a bad fan clutch? I kind of thought the cooling fan normally didn't do much once you're up to highway speed, but the engine definitely gets hotter going up a hill even at highway speed. Thanks for any advice Tim
__________________
1987 300TD wagon 193,000 miles |
#90
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What I Did
Hi Tim:
Oh...sounds so familiar. I struggled for a year, finally fixed the problem. I should have listened to Hatty and Brian and would have saved a year of stress! Anyways, first thing I did when I had the problem was check for coolant levels. If it was dropping, I understand it indicated a possible leak and therefore, a potential water pump problem. My coolant level only dropped when it BOILED! So, I changed the thermostat. You can tell how well the thermostat is working by watching the engine temperature. You'll see it rise above 80 degrees, spike and then drop. If it doesn't spike fast, I think that it could be the thermostat as it has a problem opening and allowing the coolant to freely flow. This didn't help me. Next, I was worried as I didn't think the Aux. fan, (in front of the engine) was kicking in when it got too hot and there wasn't enough air flowing past the radiator. So, I changed the Aux. fan switch. (this was easily a DIY project.) This didn't help me. Finally, we examined the radiator. It was changed by MB a few years ago, so I assumed that it was ok. Well, when we examined it found that at operating temperature, only 1/4 of the rad was warm the rest was "ice cold." This indicated a flow problem so I changed the rad. Problem solved. It was hot today and yesterday and the temp didn't rise much past 80 degrees. In your case, check to see if the Aux. Fan is kicking in when the engine temp rises above 100. My understanding is that the switch recognizes that the coolant is too hot and the fan kicks in. If the Aux Fan doesn't kick in, try replacing the switch. (Easy and relatively inexpensive.) I look forward to seeing how you make out. Good luck, and listen to these guys...they know their stuff.... Brad.
__________________
Dr. Brad 2003 C320 4Matic Station Wagon 2002 C240 Elegance 1982 380 SEL Star Certified |
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