Question about 2000 Chevrolet Astro

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Blower only coming from defrost and floor vents

Read your previous solution checked all my fuses could not find a blown fuse in compartment or under hood. any other possible causes.

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Damper is vacuum controlled, check for cracked vacuum line running from manifold to heater control box.

Posted on Aug 26, 2008

I had the same problem and yes there was a cracked vacuum line. The plastic lines get brittle and break, I replaced the whole line with rubber hosing.

Posted on Oct 30, 2008

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1 Answer

Why is there no power to blower motor?


It could be something as simple as a blown fuse or the blower speed switch is bad.

I would first check the fuse for power with the key on. Check both sides to make sure it's at least receiving power. You can use a cheap tester that lights up for the check.

IF the fuse checks OK then it's time to check the blower switch or make sure the heater selector isn't in the "OFF" position.

On some GM vehicle the heater control selector that lets you adjust from floor, to defrost, to dash vents, etc. has an "OFF" position when the selector is adjusted to the far left.

Without physically being there to actually look at it, these are the only suggestions I can come up with.

Hope this helps.

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2002 ford explorer....Just changed the blower motor. Everything worked fine for a few days and now the air will only come out of the defrost and floor vent areas. When I turn the vent selector switch...


Check under dash in duct system for any vacuum hoses blown off then check under the hood on the passenger side of engine compartent.If all hoses are connected then you will have to check the heater blend door actuator and the heater blend door lever for proper operation.

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Jan 13, 2011 | 1997 Volvo 850

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No heat and the defrost is the only place air will come out. Some time ago in the spring the a/c would not work then it started working but now the heat does not, and you get no get air flow from the vent...


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You'll need to check all fuses under dash as well as under hood in fuse/relay box, as one may be blown. Then get back to us if you check them all & are good but still have problem.

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1 Answer

Defrost and floor wont blow air but vents work


these repairs are usually best left to an electromechanic but it can be doen by anyone with basic knowledge following the troubleshooting section in repair manual which can be purchase from local parts shop or online haynes or chiltons will do and get a multitester.

First check basics: are the fuses good to defrost blower? (fuse access refer to manual)
then see if there is power to the blower/defrost switch use multi meter at 20V setting
then see if there is power to blower unit under dash (see manual under interior section to access blower motor)
probe using same setting to test for power on each wire ( as you turn blower setting from low to high you shuld notice the voltagre climbs aswell)
if this checks out your blower motor is faulty replace and your good heres a few places to get the best deal on parts
ebay.com
Peach street autorecylcing 18003652341
www.godspeedmotorsportsonline.com

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