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Back to seals, there are other seals which help keep hot air out of the engine compartment but are often ignored. On early cars, the license plate panel should have two seals, one seals the deck-lid, the other seals the muffler. The muffler seal is missing on many cars and it seems to me it would allow hot air to be sucked in quite easily. The engine sheet metal to body seal is also important.
My car seems to fry the spark plug seals fairly quickly so they need to be changed almost every year.
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Bruce Herrmann
97 C4S
'04 330i
'08 Cayenne S
'07 4.8 X-5
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