My m5 started slightly overheating, so I took it in to the dealer, fully expecting a bad thermostat. They let me know it was the fan clutch, replaced it, and told me to come pick it up. They also told me that one of my cats was clogged, and that it would cost $2,800 to replace. Apparently a code was stored. 3 miles down the road, the car overheated again. I took it back, and the service advisor told me that the clogged cat was causing the overheating issue.
3 questions:
Does the BMW ECU store codes for a bad cat that my OBD2 code puller would not show (pending or otherwise)? I'd like to know this before I replace the cat(s).
Is there any possibility that a clogged cat could cause overheating? Doesn't seem feasible to me, and the car is not down on power.
Should a <30 day old fan clutch be showing significant rust on the nut where it attaches to the crank pulley? From everything I've seen, this nut is integral to the fan clutch, and as such should be new.
Thanks,
Chris
3 questions:
Does the BMW ECU store codes for a bad cat that my OBD2 code puller would not show (pending or otherwise)? I'd like to know this before I replace the cat(s).
Is there any possibility that a clogged cat could cause overheating? Doesn't seem feasible to me, and the car is not down on power.
Should a <30 day old fan clutch be showing significant rust on the nut where it attaches to the crank pulley? From everything I've seen, this nut is integral to the fan clutch, and as such should be new.
Thanks,
Chris