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Possibel vaccum leak: Need advice S70 1998

posted by  Biz on  Tue Jul 28 15:27 CST 2009
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last visit: Wed Jul 29 14:28 CST 2009
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Just recently the vents in the car stopped blowing at their full capacity. They blow at about half their usual force even on the highest setting with either hot or cold air. We replaced the in cabin air filter, it was pretty dirty but did not alleviate the problem. The vents will sporadically blow at their full force when the car is not moving, but once we step on the gas they go back down. This led my dad to think that there is a vacuum leak somewhere but this does not happen every time we press on the brake. How would we go about checking for a vacuum leak?


Any advice would be appreciated.








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    Possibel vaccum leak: Need advice S70 1998

    posted by  KlausC on  Wed Jul 29 15:36 CST 2009
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    last visit: Fri Oct 24 10:15 CST 2014
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    Tell your Dad, these new fangled cars use computers and no longer rely on vacuum for heater systems.
    Do the Recirc and AC lights flash on start up? Assuming, of course, that the fan is in the auto position, as are the vents positions. Try that first, because if the lights flash 20 times, that means there is an error in the system.

    Klaus
    --
    The more I learn, the more I forget. So why learn?








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      Possibel vaccum leak: Need advice S70 1998

      posted by  Tidewater T5 on  Wed Jul 29 17:03 CST 2009
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      last visit: Wed Sep 18 20:50 CST 2013
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      My HVAC system (1998 Volvo V70 T5)is doing very similar things.

      May we assume that your blower motor is not making strange noises, other than unusual velocity changes? If it is making odd noises, then the blower motor may be the problem.
      See it here:
      http://www.fcpgroton.com/product-exec/product_id/14361/nm/Volvo_V70_Blower_Motor_OEM_1998_2000_/category_id/78


      Does your car have Automatic Climate Control (ACC)? If yes, then your problem may well be the blower motor resistor.
      See it here:
      http://www.fcpgroton.com/product-exec/product_id/31846/nm/Volvo_V70_Blower_Motor_Resistor_models_with_Climate_Control/category_id/78


      If you car does not have ACC, then you use a different "Resistor".
      See it here:
      http://www.fcpgroton.com/product-exec/product_id/31837/nm/Volvo_V70_Blower_Motor_Resistor_models_w_o_climate_control/category_id/78

      I have learned from the Brickboard that 10 years is about the service life expectancy of the resistor, which may well be why your and my car are having these symptoms.






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