Looking to run amp wire on passenger side

[Just C]

Hey everyone, first time posting. I recently purchased a 1996 Yukon- garage kept and under a cover with 81k miles. Everything is incredible except the audio is ****, so I’ve invested in proper speakers and an amp for it. I want to run the power cable through the firewall on the passenger side so I don’t waste wire- I’ve only got 17’. I see there’s potential under the engine coolant but i can’t reach it. Any ideas? Remove the coolant reservoir, find another route? I have route I could take on the drivers side if I drill the hole larger, but that’s wasting 4’ of wire and would make mounting the amp under my back seat too difficult. TIA! PFA

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[TxChevyGuy]

I ran my wires under the coolant tank. Drilled a nice size hole and put a grommet in it.

 

[sbnova]

same her, peel back the carpet at the passenger side footwell and drill from the inside out.