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cabin air filter replace on 2003 GMC Sierra 2500 HD

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can anyone tell me how to replace a cabin air filter?
(1) Answer
This Article has been updated by bulletin #PIT3330, dated December 22, 2004.

Condition/Concern:
A customer may inquire about the availability of the passenger compartment air filter.

Recommendation/Instructions:
Starting in 2003 model year, the passenger compartment air filter is no longer available as a factory option. With the redesigned HVAC case, there is no longer a cavity for the filter. The GM parts catalog indicates there is a replacement filter available; however, there is no provision for it.


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