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Old 11-15-2012, 07:55 PM
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Join Date: Aug 2001
Location: southern illinois
Posts: 228
93 mercedes high temps in traffic

i have a 93 mercedes 190e 2.6 thats running high temp in traffic, i replace the head gasket did the total top end. now it still get temps over 105 degrees but cools down while driving back to 80 degrees, the fan clutch is working good and t stat is good also, whats next please someone help me thank you.

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Old 11-16-2012, 01:41 AM
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Join Date: Aug 2012
Location: 10 miles from Egypt
Posts: 62
If driving, lots of air flow thru radiator. Running at correct temp range. All good. Fan clutch might be an issue, when hot and engine off, it should spin just a part of a revolution when spun and released, if it freewheels the silicone inside has left with Elvis. If radiator is sludged up somewhat or blocked with mud and leaves this could also happen (not enough cooling with lower fan speed compared to a 60 mph breeze). This will usually show up as radiator fins are much cooler on lower rows, where sludge is restricting water flow. My rad shop said a good rad should be 10F difference top to bottom. Also, your electric fan(s) should be coming on at 100C, I believe. Even if AC is not on. There are fuses and relays involved with that.

BTW, radiator swap is pretty easy DIY. If you can look down in the fitting for the lower hose and see the ends of flat tubes, and they are crusty, they look worse inside.
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Old 11-16-2012, 04:24 PM
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Join Date: Jun 2010
Location: Splendora , Texas
Posts: 223
I just had my antifreeze changed about three weeks ago. Afterwords I noticed it running a little wamer than it used to. I corrected this by removing about a quart of antifreeze from the radiator and replacing that with about a quart of distilled water. Now it is back to normal temps. I would avoid using "water wetter" and such.
1986 560 SEL
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Old 11-17-2012, 01:15 PM
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Join Date: Dec 2003
Location: Palm Springs, CA
Posts: 781
I had a '91 190E and it was always on the warm side. I think the radiator is a bit small for the engine. You might want to track down Jim Forgione's web page. He sells a resistor kit that lowers the turn on temp for the aux fans. Works well for me and our summers hit 118F.
However, if your radiator is old, change it out first and fill with 50/50.
My 320CE has a new radiator but has room for a radiator out of an E420. If you need a new radiator I would think about installing a wider replacement than stock.
'93 320CE 208K
'95 E420 126K

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