Question about 1999 Chevrolet Astro

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'99 Astro blower doors not moving to allow air flow.

When selection is made on panel the blower door(s) do not move at all for direction of selection on panel dial. I replacedthe Actuatuor blower motor and still no movement of blower doors.

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  • Anonymous Jan 10, 2009

    When the heater is turned on, the blower is moving air to the defroster no matter where I place the switch.Heat is coming out and clearing the windows but no air is coming out of the air ducts for passenger compartment

  • Anonymous Jan 15, 2009

    I am having the same problem. Air is only coming out of the defrost.

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Look for a very small vacuum line. My vacuum line runs from the right side of my blower box, under my oil dip stick, under the air intake and connects on top of the engine on the driver side. It can be fixed by sliding a piece of windshield wiper hose over the original line.

Posted on Jan 03, 2009

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I had the same problem...

There is a vacuum line that operates your selector switch, it is located under the hood, roughly in the center, up against the fire wall. If the line has leaks, your selector switch will not work and therefore all your blower doors will stay shut. Replace the line.

Posted on Jan 01, 2009

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prev.gif next.gif HEATING AND AIR CONDITIONING Refer to Section 1 for discharging and charging of the air conditioning system. The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat. Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).

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Make sure it's on max.

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A coolant system should be flush every two years.

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If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.

The DIY method is to drive you car onto a ramp or a steep hill.

Iet the engine cool off and top off the coolant tank.

Set MAX heat + MAX fan

Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,

Check coolant level and top off coolant when the engine cools down.



A shop will charge $75+ for this but using an air operated excavate tool!

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A car with over 90K miles may experience linkage problem to the heater control valve.

The heater control valve (near the firewall) may be stick over time.

Open the hood and move the heater to max and min. Back and forth.

Clean and lube the linkage with WD-40 to free the heater control valve.

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Move the fan switch back and forth to re-new the electrical conductors.

Pass a vacuum over the control panel to prevent dust build up behind the console.

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