Re: the truth about temperature senders

[raf40@oes.amdahl.com (Richard Funnell)]

Chris,

>There seems to be some confusion on the topic of temperature senders.
>There are TWO temp senders on the 5 cyl. (possibly 4 and V6 also).  The
>one on the TOP of the coolant flange (2 pin) sends info to the fuel
>injection and ignition control units.  The one on the BOTTOM of the
>coolant flange (3 or 4 pin) sends info to the temp gauge, temp warning
>light, and cuts out the A/C compressor if engine overheats.  Replacing the
>BOTTOM sender is will fix your gauge problems, but will not affect engine
>performance (i.e. fuel:air ratio as a function of temp., etc.).
>
>hope this helps - Chris

There are 3 on the urQ.  The sender on the left side of the engine feeds
the ECU.  A dual sender on the right rear of the engine feeds high temp and
low temp idiot lights.  A thermotime switch on the left rear of the engine
feeds the cold start injector (I think).  Unfortunately, none of them feed
a gauge so mine will soon have a 4th sender in a tee.

Richard Funnell,
San Jose, California
'83 urQ
'87 560 SL