cooling fan won't shut off

Brett Dikeman brett at
Sun May 22 00:56:05 EDT 2005

On May 21, 2005, at 7:23 PM, dschaible at wrote:

> cooling fan stays on stage 1 all the time (car off), pulled  
> radiator switch connector and jumped every combo except all three  
> together--no effect
> pulled after run fan connectors--still stays on
> maybe related item--lost boost on the trip when the fan refused to  
> shut down when car was off
> mfts ??

Sounds more like a stuck stage one relay?  That's a guess.  By the  
way, the MFTS has the gauge sensor and overheat switch for the ECU  
and climate control- nothing else.  The fan is controlled by the  
thermoswitch in the radiator; it's 3 pins, one common, one is stage  
2, the other is super-duper mode.  After-run is via the thermoswitch  
next to the MFTS.  Coolant temperature for boost/timing/mixture is on  
the back of the block.  A/C climate control gets the temp for "ok,  
things have warmed up enough to turn on the blower" from the valve in- 
line with the heater core (I believe).

The fan relays are behind the knee bolster, kind of a pain to get to-  
you need to remove a bunch of screws, the "cap" on the side of the  
dash, some allen bolts, the whole 9 yards.  Bentley has full details 
(make sure you're in the right model subsection, there's even  
different ones for sedan vs wagon!)

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

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