Why would your AC work but throw out cold air only in the top vents not through the front vents?
Usually it's because of a vacuum leak from a defective hose or a vacuum hose that is disconnected. Sometimes, if it has a vacuum canister, the canister is bad or the vaccum hose has fallen off or somebody forgot to reconnect the hose. Usually it is a very small hose that you will need to find, like 1/8 inch. This is caused by the vacuum from the engine intake manifold not getting into the cab. Check that vacuum line for soft spots, kinks or being disconnected. Good luckJoe The vacuum is used to activate vacuum motors which open and close doors in the air ducts. The doors control the flow of the air to the correct vents. For instance, warm air is sent to the vents below the windshield to provide a defrost function. Cold air is often sent to the vents on the front of the dash for air conditioning. After a period of time, the diaphragms in the vaccum motors will begin to leak causing the vacuum motor not to work. This is a common problem on 1980's Mercedes and can only be remedied by replacing the vaccum motor.
But, first check for loose or leaking hoses and fittings or a defective vaccum switch.
Why would the ac and heater blow air through the defroster or the dashboard vents but not through the floor vents.?
It should blow through the floor vents. Modern vehicles generally use movable baffles in there HVAC systems, to direct air flow where the controls indicate. If the controls allow airflow to the floor, but nothing flows out, there is a malfunction between the control switch and the actuator that directs the flow.
In a wagon, the horses would throw clumps of mud off their hooves when they would "dash"(or run). The dashboard was the board on the front that kept the mud off the passengers. In a wagon, the horses would throw clumps of mud off their hooves when they would "dash"(or run). The dashboard was the board on the front that kept the mud off the passengers. In a wagon, the horses would throw clumps of…
What would the problem be if all of the ac blows through the defroster vents not through any of the dash or lower vents and how do you fix it?
Why on a 99 Chevy suburban would the back vents be blowing cold air when the temp in front and back are set on heat?
Why would air only blow out the floor vents and the two outside dash vents not out the center dash vents?
What would cause a 1999 Jeep Grand Cherokee to have no ac to front vents but blow ac from defroster vents instead?
What would make the heat blow out of the defrost vents and not the front vents of a 1995 Cadillac Sedan Deville?
The year, make and model would help but many vehicles use vacuum to operate the direction of air flow through the floor vents, dash vents and defrost vents. If the vacuum supply is cut off for whatever reason the system defaults to defrost only. So if you only have the defrost mode working chances are the vacuum supply is cut off. Check the HVAC vacuum supply line under the hood for damage. If that system…