W108 Mercedes 280SEL 4.5 under the hood fuses

[SickFinga]

One of my fuses under the hood keeps blowing. Does anyone know what it is responsible for? I attached a picture of it, top right one.

[124Coupe]

My 4.5 has the following 4 double fuse blocks, from which you should be able to determine what yours is from how your car's equipped.

Radio (2A) and aerial (8A)
AC (16A) and auxiliary fan (16A)
Sunroof (25A) and heated rear window (16A)
Windows (16A) and Windows (16A)

[SickFinga]

Originally Posted by 124Coupe

My 4.5 has the following 4 double fuse blocks, from which you should be able to determine what yours is from how your car's equipped.

Radio (2A) and aerial (8A)
AC (16A) and auxiliary fan (16A)
Sunroof (25A) and heated rear window (16A)
Windows (16A) and Windows (16A)

Thanks, gotta be the AC fuse then. The clutch recently stopped engaging.

[Idle]

Originally Posted by SickFinga

Thanks, gotta be the AC fuse then. The clutch recently stopped engaging.

A good way to check if your clutch is causing the fuse to blow....

Pick up an inline fuse holder at any auto parts store.

Put in a fuse the same amps as the one that keeps blowing.

Run one end of the fuse holder wire to the positive of the battery and the other to the wire coming out of the ac clutch.

If it blows, well, you are going to need to replace the clutch. If not then maybe you have a short in the switch or a wire has worn through, making contact with the body.

This might seem like an unusual step to take, but if the fuse is not blowing in the fuse holder then you have just saved yourself the cost of an ac compressor clutch. And the fuse holder trick is a lot cheaper than just throwing on a new clutch.

Full confession: I once replaced something, I don't remember what, about 40 years ago before I fully tested the component. The problem turned out to be a rubbed through wire. That cost about 2 cents worth of electrical tape to repair.