1. Remove, flush, and thoroughly dry radiator.
2. Pry all cooling fins away from leak area (just break them if
necessary), being careful not to damage plastic/tubes.
3. Completely fill entire leak area with a thick coating of GE 50-year
silicone. (I used clear)
4. Allow to dry for 24-48 hours.
5. Pressure test the radiator with air, checking for leaks.
6. Reinstall.
You'll be out of a car for a couple days, but it's better than buying a
new radiator when the old one should last forever if cared for.
Cliff
'89 Mi16
On Mon, 9 Nov 1998, Adam Rodnitzky wrote:
> Hello-
>
> Well, after about 5 months of trouble free driving (bar the odometer), my
> 405 has developed a small radiator leak - or so I think. The leak is from
> the lower driver's side of the radiator, and it is very slow, and not
> consistent. When it does leak, it is drip by drip - it will drip maybe 5 or
> 6 tablespoons of coolant (rough guess) and then stop once the engine has
> cooled down. Also, sometimes it doesn't leak. Also, the car has about 81K
> on it, and was involved in a minor accident where the front was hit and the
> bumper pushed slightly back about 9 months ago (no, not the rear bumper
> accident!). This was subsequently repaired, and there was no radiator
> damage at the time.
> First, is it possible that it is not the radiator, and rather something
> else - perhaps some sort of plug or fitting that goes into the radiator?
> I've checked the hoses, and they are fine.
> Secondly, it looks extremely simple to remove the radiator. I assume
> that all that needs to be done is to remove the hoses and attached pieces,
> remove the plastic cowl directly above the radiator, and release the metal
> clips holding it in, then pull it up and out? When reinstalling, I
> understand that purging air from the system is important, and not
> necessarily easy on the 405 - is that a correct assumption?
> And third, is this radiator repairable - ie, it looks plastic, so I am
> assuming there is a good chance that it can't be soldered if the leak is not
> in the core - are there any sealants that I can use (internal or external)
> that won't block passages? On the Italian Cars Digest, many people stood by
> Aluma-seal (I believe that's the name) as a good solution to leaking
> radiators and headgaskets.
>
> Thanks in advance!
>
> Adam
> '89 405DL
>
>
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