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Car almost stalls when ac/defroster is turned on
06-14-2013, 10:34 AM
Post: #11
RE: Car almost stalls when ac/defroster is turned on
I think i will try it..it only takes me 10 minutes to change out the iac....i myself feel that it wont work being shorter in length but what do i know... Besides disconnecting the battery for 5 min is there anything else i should do when i get ready to start the car up with the new iac?
Thanks...
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06-14-2013, 10:40 AM
Post: #12
RE: Car almost stalls when ac/defroster is turned on
That's pretty much it besides checking to make sure you haven't knocked off any vac lines.

BTW, when you cycle the ignition key the IAC should make clicking sounds.
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06-16-2013, 06:29 PM
Post: #13
RE: Car almost stalls when ac/defroster is turned on
Well tried the unhooking the battery and putting in the new iac...didnt rev the rpms up this time but idled so low it kept stalling out..so i put my foot on the gas to keep the idle up and turned on the ac and it still did the same thing...well i had to put back the originall iac and noticed that the new one actually became the same length as the old one but didnt work correct so what did it matter...anyways i have no idea what my next step will be....help!...
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06-16-2013, 07:52 PM
Post: #14
RE: Car almost stalls when ac/defroster is turned on
The IAC is supposed to extend and retract as needed to maintain correct idle speed. If the new one was too far expended (straight out of the box) I have to wonder if it got damaged during the install? IOW, tightening the screws "squashed" it. Most brand name parts come with an instruction sheet to prevent this problem.

My next step would be to find someone who has a full function scanner with someone who knows how to use it. (garage or dealer) A full function scanner will have the ablity to run the IAC through it's cycle, which includes the ECM "seeing" where it's at. IOW, there's a feed-back function to this little gadget and the brains know if it's open, closed, or somewhere in between. That's why it's got so many wires on it.

Let us know how you make out.
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06-17-2013, 09:15 AM
Post: #15
RE: Car almost stalls when ac/defroster is turned on
The new iac was actually shorter in length when i got it...but now the same size...but talking to former mechanic at my work he says its prob not the iac...he wants to check the a/c-heater/defrost buttons with an ohm meter..he says a bad switch could be causing my prob..i dont know i'll let him check them i guess..
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06-17-2013, 10:08 AM
Post: #16
RE: Car almost stalls when ac/defroster is turned on
Can't hurt. Please keep us posted.
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06-24-2013, 08:46 AM (This post was last modified: 06-24-2013 08:55 AM by mooncrab00.)
Post: #17
RE: Car almost stalls when ac/defroster is turned on
Well it looks like the a/c might be really over charged...we let out a bunch of refrigerant from the a/c and all of a sudden the a/c started getting ice cold which it never was and it started idling fine...we didnt have any gauges at the time so we couldnt check pressures...the ac stayed cold but the car did stall about 2 miles down the road again...i was told the pressures are prob still really high and we will check them with gauges on wednesday....could someone actually have overcharged the system this much? Or can u actually overcharge a system that much?...will keep posted...
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06-24-2013, 10:19 AM
Post: #18
RE: Car almost stalls when ac/defroster is turned on
You'd be amazed at how much you can stuff into an AC system if you don't know what you are doing. There's also no perfect way to know how much is in there without gauges.

That said, here's a test I want you to try. Find the wire going to the AC clutch and disconnect it. Start the engine, turn on the AC from the dash as normal (even though the comp will not kick in) and go for a ride. This will either prove or disprove your buddy's theory on there being a problem with the AC control. It will also tell us if the AC comp is possibly binding up by eliminating it from the picture.

BTW, while you are under the hood with the engine off, turn the AC comp by hand and see what that feels like. Should feel like a series of small bumps but easily done with one hand on the center section of the pulley.
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