OK, my '04 998 Matrix is getting close to overheating when I'm sitting at lights just idling. My fans are not coming on. I noticed this problem just after I installed my Power Commander 3 USB (don't know if the problem is related or not). I tested the fans themselves by hooking them directly to the battery and they work fine. My guess is that it's probably the fan relay. So I'd like to know the following:
- Which relay is the fan relay?
- How can I test this relay?
- What's the likelyhood of the issue being related to the PC3?