Blower will not switch to defrost,floor,just vent,no heater
Had to change the inside air conditioning condenser, finally got it all back together and air works fine, but the blower only blows out the vents, does not switch to defrost, floor or mix and can never get any heat it always blows cold air.any idea what is wrong??? Thank you
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Re: blower will not switch to defrost,floor,just vent,no...
You did check for vacuum lines off, or wiring harnesses not plugged in all the way, or at all didn't you? Did you pay someone to do this, or do it yourself, because if you paid someone, have them look at all the connections .
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In the attached drawing, Part 32 moves Part 26 to direct the air flow to the desired locations. It uses vacuum to operate. The actuator may be bad or the vacuum hose my have come loose when the heater core was changed. With the car running but the blower off stick your head up under the dash on the passenger side and see if you hear a hissing sound. If so it's probably just a vacuum hose come off. AIR CONDITIONING AND HEATER UNIT BODY Fits DYNASTY LASER LEBARON NEW...
I assume your heater setting is electric control, if so either your defrost and floor heat switch failed or wire problem.
For the air not hot, check the heat control valve on the top of the hose it should be in front of the firewall. I don't know your car is using mechanic valve or electric control valve. Anyway check there first.
its called the blend door actuator its either stuck or or broken or shorted out it is deep in behind the dash located inside the air box where the heater core is and the ac condenser is its a fun job as for you have to rip your dash apart
the blower relay switch controls the blower motor,this sounds more like an air blend switch on the heater control head on the dash,not making the switch over in that switch.it could be the air blend door motor on the heater duct under the dash on the passenger side.this can be checked with a scan tool that has the capability to communicate with the bcm computer on this car.
If there is no vacuum to the mode door control motor theheater/A/C system will default to "Defrost" If there is no air coming out the vents or floor - check to see if you have air blowing out the defrost vents. If there is air coming out the defrost, then the most likely cause of your problem is a broken or disconnected vacuum line that feeds the mode control switch. On your vehicle, the vacuum supply line connects to the brake booster hose under the hood. there is a check-valve on the line between the firewall and the brake booster that can fail and leak vacuum. if there is no problem with the vacuum supply line under the hood, then the most likely cause is a bad mode control switch. (switch leaking vacuum)
If there is no air coming out the defrost vents, but you can hear the blower motor running, there is most likely a resriction of airflow etween the blower motor and the air outlet plenum. I have seen A/C evaporators completely cloggedup that will not pass any air. I have also seen paers and napkins that have gotten sucked out of the glovebox area and into the "Recirc" air inlet. Another thing I have seen several times is nests made by mice or other small rodents in the blower motor housing.
This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc. Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.
hello, sounds like the cable broke or, lots of newer veichels use air lines, any way possible, check and see if air lines are still hooked up to the back of the heater controls, should be 4or 5 air lines together, all hook on one place behind heater controlls
If I am reading correctly you are hearing the vent doors moving to redirect the airflow to the vents you choose.
This is normal and can be more noticeable if the blower fan is on, putting air pressure against the doors.