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  #1  
Old 07-26-2006, 04:34 PM
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Location: LA - the state
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another temp. question

Car runs warm, up to 100, when idling and will not cool down on its own after running at city street speeds. I take that back, it will cool to about 97.

60,000 miles ago, the waterpump was replaced. Last year, the radiator was rodded, but looks new to me. It is not the thermostat, which I just changed, nor the fan clutch, that was changed last year as well and operates as it should. I am not losing coolant.

Should I do the citric acid flush, or just go ahead and replace the waterpump again? I want to go to the TEXAS GTG saturday, but this may prevent it.

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  #2  
Old 07-26-2006, 04:50 PM
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100C is a little warm, think I would try another T stat and check it in a pan of water on the stove, Make sure the arrow is pointing ahead (or up), doubt it would help to change the water pump. Maybe your gauge is reading a little high, can you hold the upper radiator hose for more than a second or two, (when its showing 100C) if you cant its proly close to right. Anyway, I'd try another T stat.
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  #3  
Old 07-26-2006, 05:48 PM
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Is your aux fan working?
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  #4  
Old 07-26-2006, 06:29 PM
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I'm guessing that the ambients in LA are close to 100°F.

Around town, an engine temp. of 100°C. is nothing to be concerned about........especially in those temps.

The SD can run all the way up to 98°C. after a highway run and then slowing down for local driving and the ambients here are mid '80s.

You can drive it all day long at 100°C. without any issues, provided that you have a proper coolant ratio and a working expansion tank cap.

Remember, the red zone begins at 120°C..............110°C. is the point where you start to be concerned.
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Old 07-26-2006, 08:54 PM
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i differ

i beg to differ... i dont let mine get up to 100c... one time it did
and it blew off the neck of the radiator...

remove the thermostat and the temp will fall to 90...

If you live down south and your running your ac then you will probably have
to do something to stay around 90...
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  #6  
Old 07-26-2006, 09:25 PM
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Thanks to all of you for your responses.

Steve - I tested the new t-stat on the stove prior to installation.

No-bluescreen - Aux. fan works properly.

Brian - Thanks, I will keep your advice in mind. It rained for the better part of the day today, temps only in the high 80's. Engine temp. still was high. Usually, it can be well into the mid and upper 90's with high humidity and the engine temperature remaining a fairly constant 85, regardless of driving speed, A/C usage etc. These engine temps are unusual, but for now, I might just go with it.

Blueranger - You're scaring me! But thanks for the warning.
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Old 07-26-2006, 09:41 PM
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I should note that I had issues recently where my 82 300D was running up to 100C, but it was only on the highway and only with the A/C on. I did the following and now she runs a steady 90 in all conditions.

1) Replaced the fan clutch with a new Behr fan clutch

2) Replaced my stock 6-blade fan with the new 9-blade model

3) Replace the thermostat with a new thermostat

4) Drained old coolant out and replaced with new at 50/50 mix

5) Sprayed radiator and A/C condensor with garden hose to rinse off grime


The two expensive items were the fan blade and fan clutch. I am very satisfied with the results. Judging by the grime that was on my old fan clutch, I think it's a safe bet that all of the gear oil leaked out of it.
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Old 07-26-2006, 09:45 PM
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Quote:
Originally Posted by Deezl
T

Brian - Thanks, I will keep your advice in mind. It rained for the better part of the day today, temps only in the high 80's. Engine temp. still was high. Usually, it can be well into the mid and upper 90's with high humidity and the engine temperature remaining a fairly constant 85, regardless of driving speed, A/C usage etc. These engine temps are unusual, but for now, I might just go with it.
Note that I agree with others that suggest that the temp. is running above the preferred temperature. My SD is doing the exact same thing.........running close to 100C. But, the engine won't be bothered by this temperature and you can fix it at your liesure..........as I am doing.......obviously.
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Old 07-26-2006, 09:49 PM
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Make sure you have the newer 1.2bar cap.
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  #10  
Old 07-28-2006, 12:46 PM
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Please check your temp sender, have had few VDO ones go bad on me and give me insanely high reading, also the vehicle earthing.

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