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2008 Ford Explorer hissing hvac?

stuartyager4437

New Member
Joined
April 3, 2015
Messages
3
Reaction score
0
Year, Model & Trim Level
1999 Ford Explorer XLS
So this issue started as a hissing coming from the passenger side. Then we would have the shift in the AC from passenger AC to defrost while going up inclines. Now the AC barely works on the passenger side and it doesnt get cold at all on the driver side. I want to fix this myself. Please help.
 


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07EddyB

Well-Known Member
Joined
November 18, 2011
Messages
854
Reaction score
110
City, State
Bowling Green, KY
Year, Model & Trim Level
2007 Ford Explorer 4.6 V8
Search check valve. Located close to the firewall in the engine compartment. Common issue.
 








PotatoExplorer

Well-Known Member
Joined
August 15, 2016
Messages
296
Reaction score
8
Location
USA
City, State
Carlisle, PA
Year, Model & Trim Level
2008 Ford Explorer Ltd.




Rcflyer330

Well-Known Member
Joined
March 23, 2014
Messages
718
Reaction score
73
City, State
Michigan
Year, Model & Trim Level
2010 Ford Explorer XLT V6
Most likely the check valve. The one way valve may test good if you use your mouth and either blow air through but that would be the first thing I would replace they are a very common failure point, I have a 2010 and have replaced mine twice within the last two years. Do you have dual side climate controls?

The ac coolness may be a problem with the ac system check the compressor clutch see if the compressor is turning on and if you have a manifold gauge check the pressures. My car has rear heat and ac and the compressor was turning on even know the system had a hole in the line going to the rear under the passenger rear door.
 




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