Question about 1995 Oldsmobile Cutlass Supreme

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Heat and air does come from vents

Blower works controls work other than direction of heat and air.
could this be vac motor under dash.

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Check the vacuum supply to the control head switch, if it is automatic climate control u may have a defective control head, replace the entire unit.

Posted on Dec 29, 2008


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if its just the vents that dont work, check the actuator or cable (that controls the vent, def, or floor) on the hvac box under the dash.
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Could be a problem with a blend door under the dash.
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2000 grand am se heater problem in the dash as described as being the actuator? motor comes up to temp,not overheating-blower motor works on all seting but as if temp switch on dash dont work. ---answers...

There are little doors under the dash that direct the air to either the vents (blows at your face), the defrost (blows at the windshield), or underneath (blow to your feet area) - these doors are controlled by what's called actuator/s and they are usually controlled by vacuum or cables - when the air won't change directions it can be either the vacuum switch, the vacuum line disconnected, cable disconnected or the actuator itself can be stuck or bad...

You also have a heater valve that allows the heated coolant to enter the passenger compartment into a heater core (small radiator to allow heat to transfer into the air when the blower blows air across the core) - this can also be vacuum controlled or cable controlled or electronically controlled - if it malfunctions then you may not get any heat into the passenger compartment - you will have to determine if the valve is not getting the signal to open or is bad and will not open - good luck :O)

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1 Answer

No air from dash vents

They are vac. controled. The leak could be behind the controls, but first check under the hood usually near the fire wall and check for any cracked or broken vac. lines and repair as necc. this should solve your problem. The vac. lines under the hood go bad first due to engine heat. If you have a length of line to replace make sure you use vac. line so it wont collapse. Soft softs in vac. lines is another sign of a bad line replace these also.

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When you replaced the blower, did you unhook any vacuum lines to the air ducts? Chances are that you did and without them, you can't direct the air to the defrost vents or any where else. Hopefully you won't have to redo a lot of the under dash work to fix this.

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The blend door in the heater box itself is what directs the air to where it needs to go as per selector switch. The heater box is located under the dash.

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