Guzzles gas with AC on

112,000 MILES • 6 CYL • 4WD • AUTOMATIC
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BROBB56
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  • 3 POSTS
I have a 2003 chevy blazer. It guzzles gas when ac is on. Normal gas mileage with it off. Wat's wrong
Aug 3, 2011 at 5:54 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
you need to check a lot. plugs, wires, fuel pressure and filter, air filter. gas mileage has so many variables particularly with driving habits that it is difficult to pinpoint one item.

Roy
Aug 3, 2011 at 5:57 PM
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BROBB56
  • MEMBER
  • 3 POSTS
it was fine and then fuel pump went bad. Right after it guzzled gas with AC
Aug 3, 2011 at 6:05 PM
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STEVE W.
  • ✓Experienced Mechanic
  • 15,373 POSTS
Pull the connector plug off of the AC clutch and see if the mileage still changes. This will rule out a bad compressor causing drag.
If the ONLY thing that was done was to replace the pump then I cannot think of any way they are related. Did this start IMMEDIATELY after the swap (like you drove it home and the AC caused low mileage)OR did it happen a week or two after?
Aug 6, 2011 at 7:58 PM
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