I pulled the heater core today and was surprised to see that the heater box was dry. When I checked the tubes I found a thin slice in the inlet tube which had been produced by the tube vibrating against the firewall. I'll take the core to a shop tomorrow and have them replace that tube and pressure test the heater core. My advice is to wrap a thin piece of rubber around the tube at the firewall to prevent this from happening to you.

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'81 300SD

Thanks for posting theses pictures - I'll check my car. I must say I'm surprised that a rubber grommet or such like wasn't / isn't a standard fit. These cars have rubber bits virtually everywhere else.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

There is a standard fit, but itīs a plastic grommet.

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Don't Chrome them; polish them