Thanks for the assist guys. I will pull the lower dash cover under the glove box. There is a passenger airbag but also a glove box below that which I think would be closer to the plenum / heater housing etc.

As I said, there have been some pretty inadequate repairs done to this in the past and from what I have found that extends both in and outside of the car.

Steve A

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others