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Guest Message by DevFuse
 

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Defroster??'s


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9 replies to this topic

#1 Svengouli7

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Posted 09 September 2003 - 01:11 AM

Alrighty. My fan selections work fine 1-4. But when my defroster is on, no air ever blows out the top.
I know the defroster cycles during different engine load- so which vacuum line did I goof when I did my weber? Or, is there specific wiring for the defroster I coulda goofed?

#2 GLCraig

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Posted 09 September 2003 - 02:01 AM

The vacuum line for the climate controls come off the manifold if I remember right.

When you try another position like heater, bi-level or vent dose air come out of same place no matter which position you select? If so then you do have a vacuum problem.

#3 86subaru

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Posted 09 September 2003 - 06:28 AM

since were talking about fan, my 1-2 speed does not work , would it be the blower ? or under the dash some where switch :banghead:

#4 Skip

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Posted 09 September 2003 - 06:46 AM

Lets all play the "What kind of car is this game??"
It's your 1965 Chevy Malibu -- right??
ah sheesh

The vacuum operated heater control system works in conjunction with a vacuum resivour (sp?) which is the white canister on the shelf behind the pass strut tower. This canister also incorporates a check valve to prevent what you have happening from happening.
Craig is correct as usual, it is a direct intake manifold vacuum to the input side of this canister.


Jim, fine job of post stepping your doing there, replace your blower speed resistor, see Asavage's post on the subject.

#5 Svengouli7

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Posted 09 September 2003 - 08:59 AM

1,000 pardons, Mr Skip. All I've been riding are EA82 4wd wagons- in this case 5spd d/r. Getting lazy I guess.

And 1,000 thank you's. Perhaps I hooked that sucker up backwards or some other brilliant self defeating error.

#6 Cougar

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Posted 09 September 2003 - 10:24 AM

The fan motor speeds are changed by different resistors in series with the fan motor leads. They are in the air duct near the motor. I think yours are behind the gloove box. The resistors usually open up after some time and the set needs to be changed out. Wires from the motor will go to the resistor pack.

You could also have a faulty switch causing this but chances are it is the resistors causing your problem.

#7 GLCraig

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Posted 09 September 2003 - 05:07 PM

Skip,

I have never seen the canister that you are referring to on a EA81 vehicle but I have seen them on the EA82s. Do you know if they ever did put that canister in EA81s. Also I don't see any mention of it in my FSM

#8 Skip

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Posted 09 September 2003 - 05:17 PM

Craig,
You are correct the EA81's I have had have cable operated control sysytems.
Due to the nature of the problem I guessed it was on an EA82

#9 Martin

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Posted 10 September 2003 - 11:08 PM

if you ever took apart your dash, one of the hoses on the back of the def button could have come off because they are a pretty tight fit.

#10 Svengouli7

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Posted 11 September 2003 - 08:11 PM

Sooo.... turned out the vac cannister on the passenger side firewall was hooked up to an inactive vacuum port (the one that sits at 90* to the EGR, now capped off post weber install)

Runs full blast in defrost off the windsheild vents after having switched vac ports...

Skip, you'l be pleased to see that I've put my ride info in my signature lest I forget that detail again in the future.




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