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#1
04-26-2009, 04:28 PM
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Auxiliary fan runs all the time...
on my 300SD. As soon as I turn the key to fire up the glow plugs, the fan is kicking hard. This is not normal, correct? Normally it only kicks on when the engine gets to a certain temperature?
The vehicle runs/drives great and never gets over 80C. Please advise.
__________________
1985 300SD - 167k miles  1992 F350 7.3 (Soon to be converted to 2 tank Veggy/WMO) 
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#2
04-26-2009, 04:30 PM
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No, that's not normal. Check to see if maybe the previous owner hotwired the fan to be on all the time- this was the case with my car when I got it. He had a wire running from a connection near the A/C drier to the fusebox.
I could be wrong, but I think usually if the fan is suffering some sort of malfunction, it will not run, vs. run all the time. Unless for some reason your temp switch got stuck open.
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Dan 2005 E320 CDI - 246k 1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k Past: 1987 300D - 264k 
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#5
04-28-2009, 11:06 AM
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Quote:
The quick and dirty test is to just swap the relay with another one and see whether it continues to run when cold. If the relay is good then the problem is probably one of the following three: 1) Temp switch (as was mentioned) 2) A/C switch (by the dryer is I am reading the manual correctly) 3) Short in the fuse box. Test the two switchs with a voltmeter and see if the output line has +12V between it and ground.
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#6
04-26-2009, 09:44 PM
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Check the temperature sending unit on the thermostat housing. I had one that was grounded all the time, regardless of temperature. If you pull the wire off, the fan should stop....Robert
__________________
 Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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#7
04-27-2009, 01:28 AM
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Quote:
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#9
04-27-2009, 06:55 PM
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Quote:
mine never comes on... is there a relay for it that i can check? and where is it?
__________________
1985 mercedes benz 300D turbo diesel 1998 VW GTI VR6 1996 VW GTI 2.0 1999 saab 9-3 turbo 1987 300sdl (sold)
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