fixed heater core. now won't blow out ac vent
09-06-2012, 03:06 PM
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Car: 91 formula
Engine: 350 tuned port. bolt ons
Transmission: 700r4
Axle/Gears: 3.73
fixed heater core. now won't blow out ac vent
So after i fixed the heater core. My ac will blow down by the passenger feet area. It will not blow out the normal ac vent. I have the cover for the heater core currently off. But even when i put the cover back on the heater core it now blocks the ac from coming out the feet area. What gives. Im i blocking the door for the ac vent. Need help fast. It hot outside.
09-06-2012, 07:13 PM
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Car: 1988 GTA
Engine: LB9
Transmission: T5
Axle/Gears: 3.45
Re: fixed heater core. now won't blow out ac vent
You might have knocked a vacuum line off one of the actuator diaphrams when you were under the dash.
09-06-2012, 08:46 PM
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Re: fixed heater core. now won't blow out ac vent
Damn. That sounds like a needle in a hay stack to find.
09-06-2012, 10:03 PM
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Re: fixed heater core. now won't blow out ac vent
alright. I will take a look and let you know. Thanks.
09-06-2012, 11:07 PM
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Re: fixed heater core. now won't blow out ac vent
alright so I narrowed it down to what the problem is. Its the vent doors. I held the vent door that is on the inside of the dash open with some wire and it blew out the vents out to the interior. But when I throw the lever to make it blow on the windshied it still comes out the same vent facing the interior. So its in the lever and vent doors behind the dash. Any ideas. 
09-06-2012, 11:18 PM
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Re: fixed heater core. now won't blow out ac vent
I read that 90-92 cars use vacuum operated ac doors. Maybe I hit something underthere. Anyone have a diaphram of this. Any help is greatly appreciated.
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09-07-2012, 12:19 AM
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Re: fixed heater core. now won't blow out ac vent
anyone know where this vacuum line plugs into.
09-07-2012, 07:24 AM
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: fixed heater core. now won't blow out ac vent
The elbow plugs into a hard plastic vac line that goes into the inside of the car to run the HVAC doors.
Those little rubber lines need 2 be replaced.
Those little rubber lines need 2 be replaced.
Last edited by TTOP350; 09-07-2012 at 07:29 AM.
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