Heat notworking right blowing snow in car and vent setting doesn't work Help
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Heat notworking right blowing snow in car and vent setting doesn't work Help
I've had this problem since I got the car 4 months ago. (1986 Trans Am 305TPI) Every time after the car is warmed up I put it on defrost to get the window defogged. Then I put it on vent but the air stays on the defrost even though I have it on something else besides defrost.
And one more thing is wrong every time I put on defrost right on start up snow come in through the defrost vent. Then I put on the windsheild wipers and more come through. Its like the windsheild wiper are pushing snow in through the vent. I don't know but it is making me mad and I am tired of being cold at 5 in the morning going to school.
Any ideas what to do
Please Help
Thanks
And one more thing is wrong every time I put on defrost right on start up snow come in through the defrost vent. Then I put on the windsheild wipers and more come through. Its like the windsheild wiper are pushing snow in through the vent. I don't know but it is making me mad and I am tired of being cold at 5 in the morning going to school.
Any ideas what to do
Please Help
Thanks
#2
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
as for your malfunctioning switch, my 89 does this and all i do is kinda whip over that selection and it does what i want it to. the contacts might be dirty is why its not responding properly.
as for the snow coming in, all i can think of is your glass isnt sealed well or its being shoved thru the HVAC hump in the engine bay and its being blwn thru the system. id try and get that fixed as it might cause other hidden issues.
as for the snow coming in, all i can think of is your glass isnt sealed well or its being shoved thru the HVAC hump in the engine bay and its being blwn thru the system. id try and get that fixed as it might cause other hidden issues.
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
Check the tree at the back of the intake you should have several little vacum hoses goin into it, this controls your vents in the air ducts that makes the air come out the feet vents or defrost. If any of those hoses are rotted it will keep the air from blowing where u want it, As for the snow coming in check your system out make sure you havent got any holes.
#4
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
Defrost is the default. You have a vac leak somewhere. Put your ear to the HAVC and listen. If you hear a hiss, you'll probably need to replace the vac control valve.
https://www.thirdgen.org/forums/atta...duct010707.jpg
JamesC
https://www.thirdgen.org/forums/atta...duct010707.jpg
JamesC
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
JamesC
Last edited by JamesC; 01-26-2008 at 08:59 PM.
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
Ok how hard is it to remove this HVAC control I'm afraid I might break some thing when I just want to check it. I am still driving the car now and it is cold out there. I dont want to freeze from no heat eventhough it is the defrost and is draining gas.
So what to do JamesC you sound like my got to guy for this for now
So what to do JamesC you sound like my got to guy for this for now
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
Don't know if it's the same for your Firebird, but on my IROC it's literally six screws. Three hold the faceplate on, and three more hold the controls themselves.
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
I have 4 screws to hold the controls module in place but thats pretty much it. The 2 places where the screws on the right side go are broken so the faceplate hold the module from hanging. But I want to know how to get the hoses off without breaking them off. Then just put it back on after changing it. So if theres another pic to show what you mean by taking it out
JamesC good pic of the unit BTW
JamesC good pic of the unit BTW
#11
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
Like Aaron I'm unfamiliar with Firebirds. If yours is similar to Camaros, once the mounting screws are removed, you should be able to pull the HAVC out far enough to at least see (and perhaps remove) the vac harness. I can't recall exactly how the harness is held in place: either push-on type retainers or two small bolts. The HAVC at this point will be held in place by the slider control wire.
JamesC
JamesC
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
IIRC, the vacuum harness has screws, and the wiring harness has a couple plastic clips. You will also have the lights to contend with. I've read that Pontiac used more than one light, but I've never checked.
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
Sounds like there is a hiss coming from the passenger side under the hood right by the firewall
So what would that be if it is something
So what would that be if it is something
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Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
So it is hissing what do I do? Do you think that is the problem?
#16
Re: Heat notworking right blowing snow in car and vent setting doesn't work Help
look for this check valve...if it's like the camaro.
https://www.thirdgen.org/forums/tech...-identify.html
one vacuum line goes to the a/c Duct Vacuum Control Valve, that's the little thing that control the a/c, heat, etc. In other words the top sliding lever.
Maybe one of those lines is leaking back there. That would be the vacuum leak James mentions.
https://www.thirdgen.org/forums/tech...-identify.html
one vacuum line goes to the a/c Duct Vacuum Control Valve, that's the little thing that control the a/c, heat, etc. In other words the top sliding lever.
Maybe one of those lines is leaking back there. That would be the vacuum leak James mentions.
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