My daughter's using my '99 SW2 right now, and just before I let her use it I noticed that the temp gauge occasionally would stay in the cold zone for an extended period of time even though I knew the car had been running long enough to be fully warmed-up, and sure enough all of a sudden it would pop up to normal temp for no reason that I could discern....would this be the coolant temp sensor? and, if so, where would that be located?
Thanks a mil in advance!
Tim

 

Could very well bethe ETCS, and if it is replace the connector also. Buy both from the dealer.

 

two wire device located in the cylinder head, driver's side

 

Thanks, Gents! Had a feeling after reading all the stuff in here...I'll confirm or deny after the swap-out for posterity....
edit:....although God knows when that might be, she must be liking the bugger, 'cause she's reeeeaaaal hard to get ahold of nowadays.....lol!