Question about 1998 Oldsmobile LSS

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Where is the vent / AC blend actuator fuse / relay located? All the air comes out of the defroster.

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It will not be a fuse,the actuator motor is bad,the fuse is tied in with the blower and such,if the blower is working ,then the fuse is good.

Posted on May 31, 2010

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I replaced air blend actuator and the air is still blowing out front vents only wont go to floor or dash


The blend actuator/door does not control where the air goes, it only controls how much of the air coming in is routed through the ac evaporator and/or heater core. You didn't state year, make, or model, but most cars have two or three more acutators for controlling inside/outside air, floor/dashboard outlets, and defrost.

Dec 02, 2016 | Cars & Trucks

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No air blows out the dash vents hot or cold


if all your air or heat comes out of your defrost than the problem is more than likely your switch or a vacuum hose to the switch. Car's default to defrost when there is a problem. I can't recall off the top of my head but I do believe that vacuum controls the blend doors on the 98 Ranger. I can't quite remember but I think the white one is the main vacuum. Either way. pull out your heater switches, disconnect the rubbery plug with all the vacuum hoses, start the engine....1 of those should have constant vacuum, if not...chase it.....there will be 1 that goes through the firewall to the engine, the rest go to the blend doors.

Mar 29, 2015 | 1998 Ford Ranger

1 Answer

Air blows out all vents no matter where it is switched to heat or ac defrost, floor


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

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1 Answer

I have air coming out of my defrost and heat, but not hot air, but have hot air going to the rear heat. 2003 GMC Savana


You have either a blend door problem,or the blend door actuator. Both are located underneath the dash.

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1 Answer

Air, either heated or cooled only comes out the dash vents, cannot redirect air to any other vents.


The most common cause of your problem is the blend door actuator. This controls air flow from defrost, vent, floot etc. In most cases, replacing the blend door actuator will fix your problem. It's commonly located above or behind the heater vents on the floor of the cabin.

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1 Answer

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first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.

Jan 22, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Ac does not switch from defrost to ac it stay on the defrost vent does not go to ac vents air coming out defrost vent


There is a vacuum hose that runs in front of the throttle body going to the vacuum ball the hose is part plastic they get hot and break.With out this hose attached the blend door actuators will not move.

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2 Answers

No air comes out of the vents when the AC or heat is engaged. Is this a fan problem?


The Fan COULD be the Problem, but Fuse RELAY and A/C Control Modual Also Can Cause this. No Air Coming out of Vents Does SAY "FAN" is not BLOWING But it Can Be Any ONE of these Items that are Keepin FAN from BLOWING

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1 Answer

Blend door not working.


The bleed door controls air temp not where it comes out, dash, floor, defroster, this is most likely a mode control switch problem, that switch is on the ac control head.

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