What's this channel on the back of the radiator?
 

It looks like it's for wiring. L to R headlight? But my wiring harness would not reach if I took that route.

Re: What's this channel on the back of the radiator?
 

Harness ends at the driver side front fender. Headlight crossover harness picks it up from there and runs to both headlights. Yes, across the radiator to the passenger side headlight.

Re: What's this channel on the back of the radiator?
 

Re: What's this channel on the back of the radiator?
 

If you're car is not being built as orginal, you can also reroute that harness across the front of the radiator where it won't show.

Someone may have shortened your OEM harness as it should reach.

Re: What's this channel on the back of the radiator?
 

Thanks. Right now the crossover harness is in front of the radiator. I'll investigate -- maybe it has more length than it seems.

Re: What's this channel on the back of the radiator?
 

The harness that "leads" the headlamp wiring is routed through that channel. There are separate harnesses, one from each lamp that is routed to the harness within the channel.