Introduction

If you’re looking to run cables, wires or vacuum hoses from the vehicle cabin and into the engine bay, this guide will show you how to do so.

This tutorial was written specifically for Right Hand Drive (RHD) vehicles. Left Hand Drive (LHD) is very similar, instead you will find this rubber grommet to the left of the clutch pedal.

All automatic vehicles have the added benefit of using the rubber grommet where the clutch would normally be found.

Tools Required

  • Trim Removal Tool
  • Punching Tool (Screwdriver, TORX/HEX Key, etc)

Step 1

Remove the foam insert located in the passenger footwell. There’s two clips which can be removed with a trim removal tool.

MK7 Golf Firewall Wire Cable Vacuum Hose Engine Bay

Step 2

The following is made easier if you lie on your back in the footwell.

Follow the wiring looms on the left hand side, you’ll see the wires disappear behind the foam insulation. This is where our rubber grommet is hidden.

MK7 Golf Firewall Wire Cable Vacuum Hose Engine Bay

Step 3

Pull back the white and black insulation, which will reveal a plastic funnel. This is a very convenient access point into the engine bay, thank you Volkswagen!

MK7 Golf Firewall Wire Cable Vacuum Hose Engine Bay

Step 4

This is the inside of the funnel, which is thin rubber. I would estimate that 4 or 2 gauge wire would fit through here, making this hole perfect for your sound system requirements.

We chose to puncture the rubber with a T15 TORX Key as it’s small enough to fit behind the air conditioner. As we were feeding vacuum hose, we simply slid the hose onto one end of the TORX Key, punctured the rubber and pulled it through.

You could also cut a slot in the rubber from the engine bay, however don’t cut the entire piece off as you want to maintain a seal around the cable/hose.

MK7 Golf Firewall Wire Cable Vacuum Hose Engine Bay

Step 5

Here’s the view from the engine bay with the TORX Key punctured through the rubber. This is directly behind the vehicle battery which can be removed for ease of access (but not required).

MK7 Golf Firewall Wire Cable Vacuum Hose Engine Bay

Step 6

Lastly we pulled the TORX Key through, bringing the vacuum hose with it. Job done with plenty of room for more wires in the future!

MK7 Golf Firewall Wire Cable Vacuum Hose Engine Bay

3 comments on “Running Cables Through The Firewall

  1. Johnson says:

    i couldn’t find the plastic funnel will dismantle my battery and have a look in the engine bay. do you mind to show me how to get the boost tap hose from the passenger side to driver side?

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