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What causes the AC to switch from max ac to floor to defrost by itself?
Wiki User
∙ 12y ago
I don't really know, but I think your AC is broken it doesnt really matter what caused it to break you need a repair man because if it cools down or heats up by itself its not normal. If that's ur question i migth be confused
Wiki User
∙ 12y ago
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Why does the heat come out at the windhield when I switch the dial to come out at the floor in my 2004 blazer?
could be a vacuum leak could be bad selector switch defrost is the default position for this systen
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my 1998 gmc jimmy has no floor heat but i have defrost and ven heat
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Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
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broken blend door
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the heat blows out the defrost when it should blow out floor vents only
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Vacuum leak
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you have a fuse out...
What is wrong when you cut the ac switch on and it only blows on the floor and the defrost but no air is circulating through the front vents no matter what setting you turn the switch to.00' cavalier?
Check for vacuum leak either under hood or under dash Check for bad vacuum actuator under dash Check for bad selector switch in dash
Your heater on 1995 Chevy corsica will not switch between floor to defrost just stays on bi-level?
Check the vac line it runs under the battery to a ball on the drivers side fender up front it could be chaffed .
Does the 1986 e150 ford van have a problem with your heater air condition controls I cant change from floor or main only have defrost?
The various functions are controlled by engine vacuum,defrost being the default without vacuum. Look far a damaged or loose vacuum line starting from the function switch,through the reservoir,to the engine vacuum port.
Why does air blow out floor and defrost but not out vents in 1998 Pontaic Bonneville?
Check for a vacuum leak either under the hood or under dash Check the operation of the vacuum actuated motors under dash Check the operation of the selector switch
