Rad Plub Blew

Earlier I posted a message concerning the rad plug for the fan thermostat.
I have now changed the plug and seal but are curious to know why it would
have blown.
The obvious was a deteriation etc of the plug or the engine pressured enough
for it to blow.
If this is the case the same could happen again or something else could blow
in the engine.
Any advise on what I should do.

 

when the plug in the radiator of my '89 240 started leaking about a year
ago, I figured it was just that the rubber had deteriorated. I fixed it by
installing an adjustable "freeze plug" from Pep Boys, about $3 as I recall.
Quick, cheap fix, and has worked so far! Basically, a length of rubber tube
with metal fittings on each end and a screw running thru it. As you tighten
the fitting, the ends are brought together, compressing the rubber outward
and sealing the opening.....

m9876c at yahoo dot com