Question about 2000 Chevrolet Venture

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Blower fan Why does my high speed fan come on when the keys are not in the ignition in my 2000 chevy venture cargo van?Ihad to pull fuse to stop.The low speed fan still works on #3 setting.

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  • cfraser812 Dec 04, 2008

    Thanks eagleeye for trying to help.My fan is located above passengers feet.I did a test again by putting high speed fan fuse back in and relay stayed off which is normal.Next i turn on fan switch to one nothing,two nothing,three low speed,four low speed,five high speed.I think the resistor is in the switch the reason one and two speeds are not responding.How do you get switch out off dash? Where is relay located sounds like under dash.If the points on the relay are sticking on when i turn it to high speed which i suspect could happen but it works every time i test it.I am thinking the switch and resistor are the same unit.There would be a lot of arching on resistor and the van is eight years old and in the north which gets a lot of use!!!

  • cfraser812 Dec 04, 2008

    Problem fixed!!

    I was wrong thinking the resistor would be part of the switch.That would be too easy!!This is how to trouble shoot this problem.On the passenger side directly above your feet is the blower. Remove the shroud and there it is.Behind the motor is a connector that plugs into the resistor. Disconnect this and we will do a test on the male end using a DC volt meter.With power on the ignition, you will check to see if the blower switch is working. If not, the unit has to be replaced.Here goes G has 12 volts all the time,E is ground.Put meter between G and E must read 12volts.Next you will check between B and E set switch to #1speed must read 12 volts,next A and E set switch to #2 must read 12 volts,next D and E set switch to #3 must read 12 volts, next C and E set switch to #4 must read 12 volts,next F and E set switch to #5 must read 12 volts.If the switch is good you have money in your pocket!!The resistor is the female end of the unit you unplugged the male connector from. There are three screws holding this unit in place that are hard to get at so take your time.When you get it out you will see the problem.This is why they are looking for a bail out!You can do an ohm test on the resistor with no power by following same directions as above.I replaced mine without testing because you can tell moisture ruined it.It was corroded.Probably the reason it would be put in the housing is to open a vent when air is warm and close for air conditioning. Why else would somebody put it in there?

  • fin66 Dec 29, 2008

    1,2,&3 setting does not work.

  • Anonymous Mar 29, 2014

    the van seems to be ok when you turn key it just doesn't do anything at all when you try to start



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It sounds to me like your blower moter resister or your blower moter switch are going bad both are right under the hood next to the blower moter one has 2 witers on it the other has 4 it usuley on the pass side right near the window

Posted on Dec 03, 2008


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