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Old 08-13-2000, 03:38 PM
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I am new to the MBNZ world. I have a 1991 420sel that I have owned for approximately 3 months. Since weather temperatures here have increased lately (95-105F), I have noticed some strange activity with the heat gauge. Normal operating temp on this car is usually just above the 80 mark on the temp gauge. However, with hotter heat, I have noticed that at slower speeds and when pulling hills with a/c on, the temp is rising about 2 guage needles widths above the guage mark following the 80 mark (I cannot recall if this mark is numbered). Is this normal or should I be concerned?
Any input would be greatly appreciated

1993 300E
1991 420SEL
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Old 08-13-2000, 05:12 PM
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Join Date: Feb 2000
Location: Rancho PV, CA, USA
Posts: 328
If the car has been serviced properly, it is probably not the radiator. More likely suspects are the thermostat OR the viscous clutch on the fan. If the latter goes bad the fan just won't do its job. Ed
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Old 08-13-2000, 10:10 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I go about this the same way on every car.

Step 1 is to replace the thermostat. Now drive the car and come back and turn off the engine. Immediately open the hood and hold the fan blade in a position so you can get one hand on the radiator. If the radiator is HOT, the auxillary fan and or the fan clutch on the main fan is bad.

Be sure to check the auxillary fan fuse...

Donnie Drummonds
1991 GMC Syclone
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Old 08-14-2000, 10:13 AM
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Confused, hold the fan blade and put your hand on the radiator?? Is it safe to hold the fan blade to see if it will rotate?? Please re-explain.

Also, could it be that he has 100% water instead of 50-50 mix, that did the trick for me?

'89 420 SEL
'90 300 SEL
'84 300 SD (sold it)
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Old 08-14-2000, 10:27 AM
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yal yal is offline
Join Date: Oct 1999
Location: New York, Long Island
Posts: 2,704
Please read Benzmac's post again. He did say with the engine off!! This is a clutch fan it does not engage while the engine is off, but if you had just turned off the engine it may still free spin for awhile.

88 230E (W124)
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