Chrysler vehicles that use a hybrid organic acid/silicate coolant have a special 'surface treatment' in the cooling system. There are lots of ways to chemically treat an aluminum surface without "coating" it. Anodizing is one of many examples.

http://en.allexperts.com/q/Automotiv...antifreeze.htm

I don't know that the Rover cooling systems have been similarly treated for Dexcool, but I am willing to take them at their word for the recommended coolant. The PM article makes it clear that it is important to getall of the original type of coolant out of the system if you're going to switch. That's usually a huge PITA requiring several flushes with clean water. Doesn't seem worth it for an imagined problem in my estimation. Your mileage may vary, of course.

Dave

 

Good advice, stick to OAT/Dexcool and flush regularly. I don't think anyone addressed your heated seats issue. This would be an electrical issue. Start with fuses. And just from experience, don't think that because the fuse looks "good" that it's still a working fuse. The only way to truly test a fuse is with a test light. If all your fuses associated with the seats are good...Let us know, someone on here will tell you the next step.

-w