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#1
12-16-2005, 04:49 AM
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my auxilary fan is always on in my 603 any ideas???
this is my 3rd.. sdl that i have..... everytime i bought the cars, i tried washing the engine... after im done.. the engine looks spotless , but the fan remains on at all times after turning on the key.... now.... i dont think its that sensor, thats on top of the thermostat housing... because on my other ones i changed that but the fan would not come on at all... any ideas or experiences?? thanks..
also.. if i take out the wires out of that sensor ,, the fan shuts off... but why would a sensor always go bad when washed.. do you think because it was hot and when it gets sprayed with cold water it just breaks..?? or some kind of electrical issues? man this s**t go me thinking.. 
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#2
12-16-2005, 06:40 AM
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The a/c receiver/dryer has a switch that also starts this fan. If it has shorted, the fan will run all the time. Try unplugging one wire from the r/d switch.
On my old 603 this switch was broken, and it did not start the fan even when needed. In hot weather, I jumpered it and let the fan run,
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#3
12-16-2005, 12:26 PM
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Somewhere on this forum we were advised to keep the switch on top of the thermostat dry when washing the engine. I have always covered mine with a plastic bag and had no trouble.
__________________
 DS2010 CL550 - Heaven help me but it's beautiful 87 300D a labor of love 11 GLK 350 So far, so good 08 E350 4matic, Love it. 99 E320 too rusted, sold 87 260E Donated to Newgate School www.Newgateschool.org - check it out. 12 Ford Escape, sold, forgotten 87 300D, sold, what a mistake 06 Passat 2.0T, PITA, sold Las Vegas NV
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#4
12-16-2005, 05:07 PM
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gsxr had the same problem happen to him. It is the switch I believe.
Thanks David
__________________
_____________________________________________ 2000 Honda Accord V6 137k miles 1972 300SEL 4.5 98k miles _____________________________________________
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#5
12-16-2005, 10:46 PM
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bet you its the three terminal switch! I bought a spare last time I had to order one. Oh, did I say I have two 603 engines to feed? Ah yes!
Its probably that switch like I said. They don't like moisture.
__________________
'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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#6
12-17-2005, 12:26 AM
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is it the switch on the thermostat? the 3 pin. when changing that... the problem goes away but the fan doesnt come on when its suppose to...
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