Mark, Under normal tap water and with a digital ohm meter set on the 20K scale hooked up to the two terminals. The reading will vary but 8,000 ohms cold and hot water 2400 ohms. John Hervey -----Original Message----- From: id [mailto:ionicdesign@xxxx] Sent: Sunday, May 18, 2003 4:52 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Idle speed sensor Ok i have one sensor to test and i dont know how so i am asking for help again. Part #102480 Idle Speed Thermister or also known as Constant Idle Switch Thermister. This switch has 2 connection tabs on it. I hooked up a tester and ran it uneder hot and cold water and it didnt seem to do anything,