A/C air flow slows down driving up hill
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A/C air flow slows down driving up hill
My 2008 Sport Trac has recently started producing less air flow from the A/C when going up hill. The fan is still blowing and the cold air returns when I reach level ground. Any ideas? Thank you, Tom
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Welcome to the site Tom
When the air flow at the panel slows, is air then vented out of the defrost vents?
If there’s a system vacuum leak, the venting will default to defrost. Under higher throttle applications engine vacuum falls off, and with a minor vacuum leak the system is starved for available vacuum to open/close and hold vent selected positions for panel, floor, defrost etc. Deftost being default. Generally if it’s a leak, it’s under the hood within one of the small lines from heat and age. A good place to start..,
When the air flow at the panel slows, is air then vented out of the defrost vents?
If there’s a system vacuum leak, the venting will default to defrost. Under higher throttle applications engine vacuum falls off, and with a minor vacuum leak the system is starved for available vacuum to open/close and hold vent selected positions for panel, floor, defrost etc. Deftost being default. Generally if it’s a leak, it’s under the hood within one of the small lines from heat and age. A good place to start..,
Last edited by Hayapower; Aug 20, 2019 at 07:29 PM.
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