1971 280SE 4.5 overheating - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 12-22-2011, 12:15 AM Thread Starter
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1971 280SE 4.5 overheating

Hi, new to this part of the forums

The holidays are here and i have time to take the car out.
but the few times i took the car out to the city it overheats. how should i diagnose this problem? i was thinking maybe the thermostat is not working.

Any help on this? thanks in advance

1984 MB 280SL Euro
1997 Porsche Boxster
2007 Super White Tundra SR5 Long Bed 5.7
BMF 20" Novakane 5
Toyo OC Mud Terrain
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post #2 of 6 (permalink) Old 12-22-2011, 02:14 AM
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That would be the first thing I'd check. Does it overheat when the car moves past a slow gallop, or only when stationary?
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post #3 of 6 (permalink) Old 12-22-2011, 02:41 AM Thread Starter
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in slow traffic and after its been running stationary for an extended period of time as well.

1984 MB 280SL Euro
1997 Porsche Boxster
2007 Super White Tundra SR5 Long Bed 5.7
BMF 20" Novakane 5
Toyo OC Mud Terrain
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post #4 of 6 (permalink) Old 12-22-2011, 05:14 AM
GGR
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Check your fan clutch. Do the magazine test: Have the car warm and go up in temperature at idle. Then roll a magazine and try to stop the fan propeller by applying one end of the rolled magazine at the top of the blades. If you make it to stop the propeller, your visco-coupler is the culprit.
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post #5 of 6 (permalink) Old 12-24-2011, 05:59 AM
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Quote:
Originally Posted by GGR View Post
Check your fan clutch. Do the magazine test: Have the car warm and go up in temperature at idle. Then roll a magazine and try to stop the fan propeller by applying one end of the rolled magazine at the top of the blades. If you make it to stop the propeller, your visco-coupler is the culprit.
Doesn't that risk damaging the blades?

There's a cooling circuit that causes the aux fan to come on at 212 degreed F. If you're having cooling probs when stationary, you may have an issue with the fan or that circuit.
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post #6 of 6 (permalink) Old 12-24-2011, 06:52 AM
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Doesn't that risk damaging the blades?
No. You have to be gentle. If the visco coupler is shot the propeller will come to a stop very easily with no effort. If there is resistence then the coupler is still doing its job.
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