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When A/C is on car stalls at stop.

49K views 10 replies 7 participants last post by  ss4vegito7  
#1 · (Edited)
Hi everyone, I just bought my first car. 1995 Corolla for $1500. Its been good to me so far exept a wierd smell the previous owner put in and one problem while using the air conditioning.

Yesterday after school i got into the car and it was scortching hot.... so naturaly i put the Air Conditoning on full blast considiering i was lucky enough it worked in a car of its age. When I was backing up the car stalled. I didn't really think anything of it untill I got to a stop light at a major road and when it turned green i pushed the gas and noticed i was crawling. (i was just moving down a hill), Lucky i quickly pulled into a parking spot and parked. You can imagine my thoughts about this new car i just bought and what could be happening.

After a little trial and error I narrowed the problem down the the A/C. When ever it was on my car would stall right after starting or if I waited to turn it on it would stall when I breaked and stoped.

Now i know almost nothing about cars, i'm 17 and my parents are not handy at all. I am very willing to learn how to work on the car myself.


I did some research and found that it could have something to do with the a/c idle up vsv. Can anyoine tell me more about this and how I can find it and hopefully fix the problem.

Any help is appreciated.
 
#3 · (Edited by Moderator)
if your a/c pump is seizing it would drag the engine down, but also would burn the a/c clutch and burn the a/c fan belt off...

Or the vacuum system, that run the idle up circuit for the a/c is screwed up and opening a vacuum line. or maybe the elctircal too is being affected through the a/c idle up circuit...

:confused:

There are schmatics for these parts,, just can'
t remember where... for download..

the vsv and vacuum is on the backside of the engine and passenger firewall on my Corolla, but mine has a carb.
 
#4 ·
If your car has a tachometer in the instrument panel you should see the RPM's increase slightly when the A/C comes on. i would suspect a problem with the VSV valve most likely being a vacuum hose leak that connects to it. The VSV also raises the idle slightly when you make a turn which puts a load on the engine with the power steering operating. Check your local library for a Chiltons/Haynes manual for more specifics. Might also ask a reference librarian if they have Mitchels On Demand or Alldata which are both online services giving detailed info. on how to troubleshoot parts and their location.
 
#5 ·
90 GP said:
If your car has a tachometer in the instrument panel you should see the RPM's increase slightly when the A/C comes on. i would suspect a problem with the VSV valve most likely being a vacuum hose leak that connects to it. The VSV also raises the idle slightly when you make a turn which puts a load on the engine with the power steering operating. Check your local library for a Chiltons/Haynes manual for more specifics. Might also ask a reference librarian if they have Mitchels On Demand or Alldata which are both online services giving detailed info. on how to troubleshoot parts and their location.
I get alldata auto manual stuff from my library online, with my library account number. But autozone.com sometimes shows the same stuff for repairs on their website.
 
#7 ·
Problem

ss4vegito7 said:
Hey everyone, thanks for the help.

So today i tried driving the car with the air on and to my surprise there was no problem. The car didn't stall at all and didn't feel like it would stall.

What gives?
Maybe the original owner didn't use the A/C as much....If it gives you anymore problem, just remove the entire a/c unit (free up more pony power)!
 
#8 ·
One question to help me help you better.

When it stalls what happens? Do you just turn the A/C on while you're running, and the whole car just shuts off lights and all? Or does the engine just shut off? Is it instant stall or does it take a bit?

One thing you can do to eliminate an easy problem. Check all the hoses around the intake manifold, just to see if you can pick anything up by sight/feel.
 
#9 · (Edited)
I would bet thats a combination of a IAC (idle air control) valve in the throttle body and a non functioning A/C idle up VSV (which is located on the firewall behind the intake has two wires and two 1/4" ID hoses coming from it.

for the IAC take the throttle body off and give it a thourough cleaning with throttle body cleaner. If the car has a lumpy idle to begin with (without the a/c) try a good cleaning

for the A/C idle up pull the hose off the runs down under the intake and try the a/c the car should idle up about 150 -200 rpm when the a/c is on then return after turning it off you can try cleaning the VSV with a small amount of throttle body cleaner but i haven't ever had much sucess doing so. also check that the hose running down under the intake just try blowing through it to make sure its not plugged