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  #1  
Old 06-29-2013, 08:37 PM
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When should the Aux fan come on? (83 300SD)

It was very hot here the last couple days, and I noticed after driving on the freeway that while idling the temperature would climb up to the 3/4 mark on the gauge and not go back down (I have been driving this car for 2.5 years and it has never gotten that hot). The aux fan didnt come on at all, so I think that it may not be working. I am a bit concerned because I need to be able to spend 30+ minutes in 5 mph traffic at 110 degrees without it overheating and I'm not sure the cooling system is up to that right now. Is it maybe time for a new radiator?
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Old 06-29-2013, 09:45 PM
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Two questions:

1) What was the reading on the temperature gauge? "3/4 mark" means nothing to anybody but you.

2) Was the a/c on during this adventure?
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  #3  
Old 06-29-2013, 11:09 PM
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A/c doesn't work. And I should have said 2/3, or the next to last mark on the gauge.
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  #4  
Old 06-29-2013, 11:10 PM
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The aux fan in that car is only triggered by the AC.

-J
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  #5  
Old 06-30-2013, 12:36 AM
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Hmm, that's what I was afraid of. The aux fan has come on sometimes before but I guess that's for a similar reason as the heater constantly turning on and off by itself than anything else. So with just the belt driven fan the temp should start to drop at idle even when it's 110 out rather than keep going up?
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  #6  
Old 06-30-2013, 12:07 PM
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Quote:
Originally Posted by 83w126 View Post
Hmm, that's what I was afraid of. The aux fan has come on sometimes before but I guess that's for a similar reason as the heater constantly turning on and off by itself than anything else. So with just the belt driven fan the temp should start to drop at idle even when it's 110 out rather than keep going up?
If the a/c doesn't work, the fan will never operate.

We can't help you if you can't read the temperature gauge and report back with an actual temperature of the coolant.
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  #7  
Old 06-30-2013, 12:27 PM
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the top mark on the MB cluster should be 120, it's the maximum temp the car is safe to operate at, and it should have red line next to it. I tried to find an image of a gauge to post, and couldn't.

the mark below that should be 100, and it's perfectly safe for the motor to operate there. it's hot where you are, the engine can't unload as much heat, as long as it does not get up to the 120 mark, you should be ok.
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  #8  
Old 06-30-2013, 04:52 PM
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On my 1978 300SD the fan comes on at 200F and when A/C high side pressure exceeds 240 psi....
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