It runs constantly. This morning at first startup and each time I've checked thereafter.
I was reading a year old thread by csnow about the fan not coming on. If all the troubleshooting procedures are pretty much the same, it looks like it is over my head.

Should I disconnect the fuse to keep it from burning out? Or not worry about it until it gets to the shop in a few weeks?

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63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6

Have you checked the engine temperature sensor ? If the aux. fan stopped when disconnecting the sensor it's likely the cause.

__________________
'86 560SEL | Silver Ext. / Blue Int. | 201K miles (Apr. 05) | 204K miles (Feb. 06)

Yes, start at sensor.
Looks like this:

__________________
1986 300E 5-Speed 240k mi.

Thanks guys, will do.

Should I disconnect the fuse for my 4 hr drive over the holiday weekend? I would put it back in if there was traffic, but that would be unlikely.
Don't want to burn the sucker out.

__________________
63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6

I disconnected the sensor with no change in fan activity, still runs.

Could you point me in the right direction? Thanks.


edit> originally by sjsfiji


I think this is what I'm looking for. . .

__________________
63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6

When you unplug the sensor, the fans ARE supposed to run.

Clear this with someone else first... but I believe if you jump the 2 wire connector you just unplugged, the fans SHOULD shut off. If they do, then your problem is most likely the temp sensor mentioned above. If not, you'll need to follow other parts of the system.

The temp sensor is cheap, so if it's old, the cost is small to replace it.

__________________
Willy

'94 E420 White

Mods
-------
Berg Werks Keyless Entry
Buzzer replaced with Chime
Dash Light Upgrade
Burlwood/Leather shift knob
Alpine CDA-9815 Head Unit
2002/2003 16" C Class 7-Spoke Wheels
Updated "Chip" to fix Code 19 problem

I think that rules out the temp sensor itself being stuck on, since you have to jump the sensor (zero resistance) to force the fan to come on high. At least on my model.

__________________
1986 300E 5-Speed 240k mi.

Actually, the fan will come on when you unplug the sensor.... so, unless we are saying the same thing, the sensor is still in play.

Of course, I have a '94 and your vehicle is basically the same as his.

__________________
Willy

'94 E420 White

Mods
-------
Berg Werks Keyless Entry
Buzzer replaced with Chime
Dash Light Upgrade
Burlwood/Leather shift knob
Alpine CDA-9815 Head Unit
2002/2003 16" C Class 7-Spoke Wheels
Updated "Chip" to fix Code 19 problem

Fan on 86/87 models does not use a thermistor sensor.
It uses the 3 prong , switched to ground system sensor.
You have a bad sensor or a stuck relay contactor.
Unplugging the sensor or relay will stop the fan..unless you have a bad ground in the harness.

If you unplugged the engine temp sensor and it's still running, it must be running LOW. The problem would be your refrig. pressure switch at the A/C drier. Try unplugging that and the fan should stop. If it doesn't, you have a bad relay. I'm thinking that the HIGH fan aux circuit might be OK if the aux fan runs on LOW.

__________________
sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen

It was the A/C pressure switch. It was running on low and stopped after disconnecting it.

The A/C aint working right now anyway. . .

Thanks!

__________________
63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6