After recently having an issue with a blown radiator fuse in my F355 I thought it would be a good idea to car some spares with me. I also wanted to review where the fuse box was located. I did some searching but didn’t find anything straight forward. So here it is.
In Section L – Electrical System page L21 of the owner’s manual you will find a diagram of the fuse box layout:
If you look at the legend you’ll see:
that:
20 = RH radiator fan
24 = LH radiator fan
Thus, they are here:
The fuse box location is in the front of the foot well on the passenger side, which you access from inside the car. An old photo I have is:
which looks a bit strange compared the owner’s manual but that could be because my car is Australian delivered. If you look carefully you can line up the layout (in my picture there are 3 x relays at the top, while the owner’s manual has the same 3 at the bottom).
You can also pick the radiator fuses because they are larger (initially 30A but now 40A) that any others. I’ll have to get a better picture at some stage.
So if your F355 is getting overly hot when stuck in traffic for example, first step is to peel back the front all of the passengers foot well and check that the radiator fuses are not blown. They were originally 30A but have been upgraded to 40A as the ‘unofficial’ fix I was told. Main point, is I now carry some spares, just in case and now I also know where they are if they need to be replaced!
Love the F355 
Changing the fuse from 30A to 40A is a sticking plaster for failing radiator fans. You risk damage to the fuse box by running 40A fuses in there. Replace the radiator fans and you will find that you can run the correct 30A fuse without issue.
LikeLike
I hear what you say but the change was made by my trusted mechanic who has worked on these cars for years and is factory trained.
LikeLike
I wouldn’t trust a mechanic who fixed an electrical issue by fitting a bigger fuse no matter where they were trained.
LikeLike
I have never had any reason to not take his advice and he has always done the right thing for me. Besides there is no guarantee that replacing the radiators would fix the issue.
LikeLike
It’s your fans that are bad, not your rads.
LikeLike
Well there is no guarantee that new fans will solve my issues either.
LikeLike
Other than the many times I’ve encountered this issue in the past and fixed it by replacing rad fans rather than speccing a bigger fuse than the factory did.
Anyway, just thought it might save you a bigger bill in the future. Enjoy your 355.
LikeLike
I appreciate the input and I will add to the list of repairs that need doing, however I have bigger with the car at the moment. Thanks for your input.
LikeLike