Intermittent fault with blower motor

Hello needed some advice and help with k12 blower motor how can I access this heaters not working only works a little when tapped on around that area and that too noisily I'm frozen in the car having to drive 8 hours a day doing deliveries I'm not that savvy and help would be greatly appreciated Thankyou
 

Just keep whacking the side of it lol
 
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