I've been experiencing a CEL flash every once in a great while while cruising on long distance trips. I was able to recover fault code #1223 from the ECU which indicates the coolant temp sensor is acting up. I asked the shop to replace it with a new, 2-pole PN 13621357414 but they discovered a 3-pole variety was installed instead. WTF? 2 wires from this connector go back to a relay mounted on the fuse box. The Tech said he followed one wire that headed off under the left front fender and thought it might be another fan relay or something. Does anyone know if this was a TSB fix for A/C cooling for something? Chances are disconnecting and cleaning that corrosion will take care of the fault codes but I'd really like to know what this is a solution for - and the part number for that 3-pole sensor! Isn't it fun working on 25 year old stuff?