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No vent airflow: 98 Honda Civic

jay on Wed June 04, 2008 10:43 AM User is offline

98 Honda Civic EX, Auto, AC, 237,000 miles.

Blower fan works at all speeds, but there is no air flow from any vent/mode positions. I have also changed from vent to recirculate with no change. Even in defrost position, there is on air flow from upper windshield vents. I moved the blend door lever from hot to cold, still not airflow. You can feel a faint amount of air leakage from under the evap box in all positions. With AC on, you can feel the change in air temp, just no air flow.

The blower motor is not making any unusual sounds/rattles. Is it still possible that the squirrel cage is loose on the motor shaft?

I have auto ac knowledge and experience from past mechanical work; also have alldata on this car.

Thanks for any help on this matter.

mk378 on Wed June 04, 2008 10:50 AM User is offline

Might have a mouse nest in there or something. If you pull the blower motor you can look at the most likely areas for mice or leaves. You can also pull the evaporator box to look at more of the ductwork without taking the dash out, but refrigerant must be recovered first.

jay on Wed June 04, 2008 10:57 AM User is offline

Will I have to pull evap to gain access to blower? Alldata was unclear on this?

Not too familair with case/duct work designs; was wondering if mode motor or recir/vent motor could have failed in a position in between that entirely blocks all air flow from blower somehow.

Thanks in advance

GM Tech on Wed June 04, 2008 11:02 AM User is offline

Are you sure the air isn't blowing out the defrost???? could be the mode or actuators- are they vacuum controlled???

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

mk378 on Wed June 04, 2008 11:17 AM User is offline

I think the blower can be removed by just dropping it out the bottom, but it may not clear the floor/carpet to fully come out of the car without further disassembly of the evaporator, etc. Alldata should know. Even if that's the case you can still simply remove the screws and drop it down some to inspect the squirrel cage wheel.

The actuators are either mechanical or a motor turning the mechanical linkage, I don't think it can fail in such a way that all airflow is blocked. There is one for selecting vent/floor/defrost outlet and one before the blower to select fresh or recirculated input.

jay on Wed June 04, 2008 11:47 AM User is offline

I checked airflow in all mode positions and only a very very faint amount of air flow; same at defrost. There is some airflow leakage around the box under the passenger side, but I suspect this is normal.

BTW, AC works great; can feel the cold air leaking from case when it is turned on

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