On 86+ models with A/C the radiator temp switches only connect to speeds
1 and 3 (low and high). Speed 2 (medium) is turned on and off only by
the A/C system when it thinks it is needed or not needed by the A/C.
Pulling relay #5 disables speed 2.( Never do this and then run the A/C
for long)

speed 1 - turned on/off by radiator temp switch low side  (switch
provides current to fan resistor, then fan)
speed 1 - turned on/off by A/C control panel on/off switch  (switch
provides current to fan resistor, then to fan)
speed 2 - turned on/off by A/C refrigerant high pressure switch  (switch
controls relay #5, relay provides current to fan resistor, then to fan)
speed 3 - turned on/off by radiator temp switch high side  (switch
controls hidden dash relay, relay supplies high current direct to fan)

The Bentley "main" wiring diagrams are wrong for A/C models in the
radiator cooling areas. You must look at the Bentley A/C wiring diagrams
for your year to see the differences..

Mark

David Hally wrote:

>Thanks Mark, I'll look into it. I do have the 3 wire
>connector on the sensor on the left (Driver side) of
>the radiator disconnected, is there another one for
>the 3rd speed? or is it controlled by the AC somehow?
>Dave
>--- mark drillock <drillock@earthlink.net> wrote:
>
>
>>In 86+ models with A/C there are 3 radiator fan
>>speeds. If you pulled
>>fuse #1 and relay #5 then the low speed is half
>>disabled and medium is
>>completely disabled. Low speed can still be turned
>>on by the A/C switch.
>>High speed is controlled by the radiator temp switch
>>turning on the
>>hidden high speed relay. If it really is the highest
>>speed that is on,
>>pull that hidden relay. Drop the fuse panel down.
>>Push the driver's side
>>dash end square defroster vent up and out. Shine a
>>light in there and
>>look in the hole. The relay holder is screwed to the
>>body below the left
>>end of the windshield. It has large red wires to it.
>>Reach up from below
>>and pull the relay up out of the holder.
>>
>>
>>