What is the purpose of Heat Shields underneath the car (1994 Nissan Altima) ?

Question:
Since the heat shields started rattling and since they were about to fall off, my mechanic removed them. His explanation was that they are only needed if you are driving on grassy roads to prevent fire.
However, a column in wallstreet journal said that not having heat shields may have bad effect on functioning of other parts in the car. The column did not explain which parts. Please Help ! Should I replace the Heat Shields ?

Answers:

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it depends on where they were located if they covered the catalytic converter the mechanic is right.stop here don't read on, if they didn't they are also used as splash protection. if you don't drive much in muddy type water when it rains you should be OK or if you do just wash under the car when you wash the car. or you u can take the wait and see what happens if you don't replace them.

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That all depends on what heat shields were removed.
Were they protecting another component from heat damage?(could cause problems)

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Were they on the botom of the car? (no-biggie)

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forget the shields.. they do help the exhaust system stay hot to burn moisture and gases but if u still pass inspection i would not worry except when parking in a field. if it was a shield next to starter u could have problems

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to keep the extream heat 400 degress from heating up parts that can't be exposed to that type of heat .
And to keep them from starting grass fires when parked on grass. And they will if you don't have them. Can start the car on fire if they are missing.

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the heat sheild is to keep your floorboard's from over heating and causing harmful vapor's from your car's rubber or carpet inside the car,,,,,smell anything funny??

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i own a repair shop,and i,ll try and explain it,they are a good thing to have on,they do not at any time ever hurt the car or its performance,,they do help keep the heat away from the bottom of the car,which can reach some pretty high temperatures sometimes,and they are a safety feature ,which is designed to help force the heat away from the bottom of the car,if there removed you will notice the floor area of the car getting hot,as for me id prefer they was on,rather than being off ,but its really up to you on this one,if you want them or not,good luck i hope this help,s.

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heat sheilds are used to sheild heat between the exhaust and the floor of the car and on the bottom to keep from burning or prevent fire from starting in tall grass or trash .

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Only if the heat shield's were between the exhaust system and the floorboard. Your mechanic did the appropriate thing. You should now by now that the Wall street Journal contains too many left wing do gooders? They may hear a tiny bit of info. from ANY car manufacturer run their uneducated slant and that's the automatic Gospel. If your tailpipe / muffler is further than one foot away from steel or neoprene fuel lines you'll be fine. If the exhaust is too close the fuel may boil in the line causing the motor to vapor lock, 99.5 % of the time this happens to under hood lines because they may get the the hottest.
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