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VVT swapped NA & TD04 turbo NB
328 Posts

Ingress of water, you could chase this issue for years front to back, these are potential causes if you want to go down the rabbit hole.........

  • Heater matrix pipes from the bay into the cabin, check if they are leaking, pretty obvious dampness from around the area under the glove box
  • Header seal that runs across the length of the windscreen and down the A pillars
  • Blocked A pillar cups
  • Poor sealing of windows against the roof seals
  • Roof seals on both hard and soft top
  • Water ingress inside door card (normally caused by bad weather seal along glass to door
  • Sill drains blocked and water backing up (feel behind seat belt tower)
  • Sill drain plastic one way flap broken, causes condensation back up from the road
  • rain rail on soft top worn or damaged
  • rear window seal
  • Boot lid seal broken
  • Bad rear light seals
  • Aerial seal broken
  • Condensation around battery where vent tubes are not fitted
  • A missing drain grommet (anywhere around the underside of the car)

Probably missed a load, I can't really be bothered to chase condensation issues anymore unless there's actual proper water ingress somewhere as it's just expensive and I don't daily my MX-5s
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