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Bad smell from trucks air.

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Old Feb 27, 2008 | 12:46 PM
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5.3LGMC
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Default Bad smell from trucks air.
Well.....when i turn my heat on i get a stale burning smell that just stinks and it seems to go away for the most part when i turn it off or on cold??? Do i need a new heater core?
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Old Feb 27, 2008 | 12:50 PM
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my 01' Silvy used to do the same thing
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Old Feb 27, 2008 | 03:02 PM
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Yea, that is probably it. Anti-freeze inside the cab stinks like pee.
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Old Feb 27, 2008 | 03:37 PM
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Replace the in cab air filters under the glove box and it will take care of the problem.
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Old Feb 27, 2008 | 08:42 PM
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^^^^what he said,and when you do chang em' youll be amazed with all the crap thats inside the filter!
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Old Feb 27, 2008 | 08:47 PM
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Thats really what happens when the heater core goes bad. It gets a small hole and leaks.......your passenger side floorboard should be wet a little also. If the heater core is under the dash like most.
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Old Feb 27, 2008 | 09:01 PM
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99 don't have the filter do they??
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Old Feb 27, 2008 | 09:32 PM
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They should. I believe 99-02 uses the same filter.
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Old Feb 27, 2008 | 10:54 PM
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My 99 has a cabin air filter...2 of em side by side actually IIRC...
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Old Feb 28, 2008 | 07:20 AM
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yea two side by side, under/behind glove box, you can get to them fairly easy it's just a plastic plate the 1" wide or so you take out the fastener and they drop down and out.
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