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Old 05-24-2002, 07:11 PM
Holson Adi's Avatar
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Question A/C on and my car is boiling hot??

Well it was an unusually hot day in Boston (85F) and I decided to use my 'newly found' A/C. Sure enough the A/C kept all four passengers nice and cool! However it wasn't very nice to the engine.

Without A/C. The water temp is around 85-90 and that's pretty much normal IMO.

Then with A/C on + traffic, etc. the temp hovered around 95-100!
Is this normal or should I get the cooling system flushed (the color of the water is some sort of bluish dark green) and the thermostat replaced?

After driving with A/C on (ever since I found out that it works.. :p ) I also noticed that the car is definitely more powerful w/o A/C on.

Oh weird thing is... with all this high running temperature, miles and miles of driving, the engine seems smoother now than it was. The rough idle is definitely gone.

I do recall my W124 doing the same (temperature wise), just that its A/C is nowhere near as cold as the W123's (I wonder why...)

Any ideas?
I'm kinda worried that it might overheat when the real summer approaches... (90+F)

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Old 05-24-2002, 07:25 PM
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thanks! such a relief to know...

I thought it was going to self destruct! I didn't mind it though because it did run better. Oh well, if they could run in the middle east 24/7 then it should be able to run here..

The aux. fan is definitely working. It was so loud in the garage (as if the diesel engine itself isn't already loud) that everyone looked!

I wonder if there is a way to make the aux. fan come on earlier.

I'm also going to check to see if I have the newer main fan (the one with more fins) that supposedly cools better.

I'm also going to give Pepboys a visit and get some water wetter and some Redline DFC.
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Old 05-24-2002, 09:10 PM
roadracer
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aux. fan

Everyone keeps saying that their aux fans are so loud on their W123's. Mine is quiet. I can barely hear it when it is working and it does come on all of the time because of the AC. BTW, I run only about 30% coolant and two bottles of Red Line Water Wetter. My tem usually only gets to about 95 and sticks their in the mid summer with the AC on full. Anyway, my fan has only been quiet. I don't know, maybe I just got lucky or something.
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Old 05-24-2002, 09:57 PM
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Holson, like I always tell people, your best bet for cooling performance is actually 100% water...although this isn't necessarily good for corrosion resistance.

If I really wanted to carry this all the way, I'd run 100% distilled water and the *appropriate* amount of water wetter (aids in cooling PLUS adds corrosion inhibiters).

According to tests, this config can allow a motor to run 10-20F cooler than the standard 50/50 mix.
If your system still gets too hot after doing this, then something in your cooling system is seriously messed up.

Naturally, you don't want to run this type of config once the temps start dipping near the freezing point.

Oh ja....pop in one of those new fangled AutoZone thermostats
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Last edited by ck42; 05-24-2002 at 10:06 PM.
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Old 05-25-2002, 05:51 PM
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what do you mean by the appropriate amount of water wetter?
I think I'm going to get my cooling system flushed this week, maybe I'll ask them to fill it up with like... 20/80 antifreeze/water
and add some Water Wetter...

I know why my 230E is rather cool running even though the temperature in Jakarta is always around 98F.... I filled the system up with mostly water...and a bit of anti-freeze/corrosion inhibitor.

I also remember my dad getting REALLY frustrated with his W123 280E.... his solution to overheating was putting more and more anti-freeze... :p oh well...

I've also heard of this Autozone thermostat... if it ever overheats then I'll do that. For now I think it's normal.
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Old 05-25-2002, 06:03 PM
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Holson,

What I mean by appropriate is that you should add the recommended amount of water wetter for best performance.

This is NOT one of those things where 'If some is Good, then more must be Better'.

The water wetter is simply reducing surface tension (surfactant). The water wetter liquid itself is NOT what is giving the improved cooling abilitiy...the actual WATER is still doing that. It's just that the water wetter allows the WATER to do it's job a little better.

That reminds me....I need to head on down to PepBoys and pick up some more DFC and a bottle of Water Wetter myself

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1985 300SD - 'Grace' (198K mi.)
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2013 Honda Accord Sport
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1995 Ford Contour SE (Retired)
1976 Porsche 914 (Sold)
1972 Datsun 240Z (RIP)
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