Question about 2004 GMC Envoy
While it never hurts to change the fluids, that may be unnecessary in some instances. The oild should likely be changed, as well as a new filter. The coolant may not need to be changed since it is designed for about 100,000 to 150,000 miles. The transmission fluid and brake fluid will be okay, as will the power steering fluid. The gasoline may be a different story unless you have added the necessary additives. Not certain how many gallons may be in your tank, but if it's all of that age and has not been stabilized I would recommend draining the tank (and maybe changing the fuel filter once you have burned through a few tanks of gasoline. the fuel filter in underneath the vehicle, costs about $20 for the part and $20-30 labor to replace.
Posted on Jul 13, 2009
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Posted on Jan 02, 2017
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Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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