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#1
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560 sl electric cooling fan
I checked for threads but couldn't find one. The electric cooling fan on my 560 never comes on. I hooked the fan directly to a 12 volt supply and it worked fine. I'm guessing there is a sensor at fault. Anyone have an idea which one and where it's located. Thanks
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#2
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should be a sender off the block? they are usually rated at 100C
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace |
#3
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There is another one on the AC receiver/drier.
Measures refrig temp. |
#4
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Rowdie's post jarred my memory about this switch and circuit...
On my '87 560, following the wire from the receiver/drier over and up the passenger side of the radiator, you'll find a ceramic resistor that due to it's location fails quite often. You'll know if it's bad simply by squeezing it between your thumb and fingers; if bad it will crumble. Or check with voltmeter on either side of resistor to be sure. Replacement is very inexpensive, and easy. Bob
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Bob Jones Bradenton, FL '87 560SL-Sold '99 SL500 For Now |
#5
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I actually looked at that resistor. Any idea what it should ohm out at?
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#6
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Quote:
Bob
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Bob Jones Bradenton, FL '87 560SL-Sold '99 SL500 For Now |
#7
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aux fan
I checked the ceramic resistor,it did crumble. I replaced it,still no fan working.checked fuses,all ok. the temprature switch on the engine has three post one connector goes on two of the post, another goes on the remaining post.I unhooked the two post lead and jumped the wires. nothing happened.thanks miker
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#8
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Quote:
In it, you will find the following diagram (and a host of other info). The Aux fan is controlled by two inputs: Coolant Temp, A/C pressure. The resistor is only for the A/C circuit. The coolant temp provides full voltage, when the temp sensed is above 105C... The other side of the temp sensor is to cut off the A/C if the temp gets to 115C.
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RM Smith 1988 560SL "Where is it again that we are going, and why are we in this handbasket"? |
#9
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aux fan
I took some time, but I have figured why my aux fan would not work.there is a switch on the drier that is partly red in color disconnect the two wires start the car. the fan sould be running.you will have to replace the switch.Im not sure if it would loose the freon if you unscrewed the old one.you may need to take the car to someone that can save the freon. give them the new switch and have them replace it.then put back the freon,and check to see if it needs more.good luck miker
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#10
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forgot jump the two wires this should make the fan run
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#11
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Yep... Shorting the wires will force the fan to come on, just like a high pressure on the drier (consult the wiring diagram), but this does not prove the fan will function properly. Shorting the wires together does prove the relay for the A/C drier pressure is functional if the fan comes on, and it also proves the resistor is not open.
I suspect an aux fan relay is faulty in the OP's post. Otherwise, wiring is suspect. Since he jumped the contacts on the temp switch and the fan did not run, I suspect the relay. The fan will work independent of the A/C circuit (once again, consult the wiring diagram), and vice-versa. The two circuits are essentially separate. The A/C pressure switch routes the voltage thru the resistor, but the temp switch does not. And according to recent discussion on another board, if you do change the switch on the drier, you will vent freon... Question: When do you expect the auxilary fan to be on?
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RM Smith 1988 560SL "Where is it again that we are going, and why are we in this handbasket"? Last edited by Walrus; 11-22-2010 at 01:50 AM. |
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