From my experience of a DHC.......
Rainwater entered the cabin from 2 main places.
1) The points where the top of the doors' quarterlights meet the A post and hood material. (That means both doors) These only leaked when parked up for a while in heavy rain, not when moving. Water falls directly on to the front corner of the respective seats and then trickles back on to the absorbent tartan material and sponge core. Lovely wet seats....
2) Over the top of the inner sills directly under the doors. The plastic membrane behind the door cards deteriorates, or goes missing when the doors are restored. Instead of exiting through the doors' drain holes the rainwater falls down the inside of the door, over the rubber door seals and into the car.
Just for fun the steel pipes to and from the heater matrix corrode inside and out and the resulting rust expands and lifts the hardened rubber seals off these pipes. When the seals leak, they let go big time and sweet sickly steam fills the cabin and mists up the windscreen.
Adam
TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, S/S Single Pipe Exh, 3.08 Rear, 200lb Spax & PolyBushes all round, Anti- Dive, Strut-Top Roller Bearings, Capri Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 14" 5 Spokes or Maestro Turbo 15" Alloys, Cruise Lights, S/S Heater Pipes, Replacement Fuel Tank. No Door Stickers. Mine since July 1986, V8 from 1991 courtesy of S&S V8 conversion and big brake kits.
