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#1
07-22-2008, 06:24 PM
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Is this normal
My 1987 300SDL fan turns on when the engine is cold, is this normal???
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN  1995 E320 SE 220k mi 1984 300SD 350k mi 
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#2
07-22-2008, 07:42 PM
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Is the AC on?
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#3
07-22-2008, 08:03 PM
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The electric fan is turned on in low speed by the a/c system when the pressure of the refrigerant exceeds 20 bar (~300 psi). If yours comes on immediately, the switch (located at or near the receiver-dryer) or its wiring may be shorted. The fan should not turn on if the climate control is turned all the way off.
In your model, the aux fan can also be turned on in high speed by a sensor in the water jacket, if the temp exceeds 105C. If it is turning on immediately and especially if it does so with the a/c off, then that switch or its wiring may be shorted. Both of these functions use relays that live in the relay box, behind the fuses. If the relay or its wiring has a short, you could get the same symptoms. To check further, find and disconnect the wires from those switches, one at a time, until the fan stops. Then replace that switch with a new one. Ditto for the relays. Let us know what you find. Jeremy
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#4
07-22-2008, 09:19 PM
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If the AC is on it will kick right on, or should...
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#6
07-22-2008, 10:31 PM
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A/C is no even on, i turn on as soon as the engine is fired, and some times it stays on for 45 Mins when the engine is off, the temp is at 80C constant, i have swap relays and the problem still presist, do you think R134a System is to blame???? It was done by a professional because it cost 5K and a well known place for A/C convert, thank goodness the previous owner did that.
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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