WATER INGRESS 1981 MERC 420 SEC

[Brin Davies]

I am seeking advice please.
I have water coming into the front passenger footwell - near the front near side wing - it then tracks under the passenger seat and saturates the rear near-side passenger carpet. During it's journey the water enters the front seats' heater unit - thus rendering it useless.
Has anyone else experienced this difficulty with their 420 SEC and have you been able to cure it?

[Brin Davies]

Thanks for your helpful replies.
Can you tell me where the drainholes are located in that area of the car - I will then instruct my garage to clear them when my car goes in for MOT in two weeks time.