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Possible Vacuum leak???

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Old Feb 8, 2010 | 11:56 AM
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flyinlo24's Avatar
flyinlo24
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Possible Vacuum leak???

I have a brand new issue that just started with my hvac system.. With the heater on full speed it works great, but when i step on the accel, i can hear the heater almost loose power. It sounds like the blower gets turned down but when i let off the accel, the power restores to normal. there is no change in the temp, just the speed of the blower? Any possible causes?

2003 Excursion V-10

flyinlo24
 
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Old Feb 8, 2010 | 01:12 PM
  #2  
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rlh68050
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Originally Posted by flyinlo24
I have a brand new issue that just started with my hvac system.. With the heater on full speed it works great, but when i step on the accel, i can hear the heater almost loose power. It sounds like the blower gets turned down but when i let off the accel, the power restores to normal. there is no change in the temp, just the speed of the blower? Any possible causes?

2003 Excursion V-10

flyinlo24
Check to see if the air flow is being directed to the defroster vents at the same time.
 
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Old Feb 8, 2010 | 01:24 PM
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Originally Posted by flyinlo24
I have a brand new issue that just started with my hvac system.. With the heater on full speed it works great, but when i step on the accel, i can hear the heater almost loose power. It sounds like the blower gets turned down but when i let off the accel, the power restores to normal. there is no change in the temp, just the speed of the blower? Any possible causes?

2003 Excursion V-10

flyinlo24
You didn't say--is yours a 4x4? If yes, it may be a vacuum leak to your hubs. Fairly common. Causes vacuum-operated internal doors to return to "normal" state. The change in blower pitch you hear is probably just the air being sent to a different output location.
 
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