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Is it common for the plastic heater core box on the firewall to disentegrate?

(1996 Cadillac DeVille)
in Columbia, MO on February 12, 2013
I started smelling burning plastic from the engine compartment then I discovered the plastic housing is disentegrating due to engine temperature exposure. Bit of plastic are contacting the exhaust manifold. Is there a solution?
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Popular Answer
of Greg's Orange Auto on February 12, 2013
on February 12, 2013
yeah,one of the downfalls of GM products,the crumbly plenum box.just have to get a new one.
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