2003 Chevrolet Impala Intermitant AC & Cruise Control

Tiny
MAC1233
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  • 2003 CHEVROLET IMPALA
Both A/C & Cruise Control turn off & on whenever they feel like it.
Once in a while, car will die while stopped @ idle, but starts rite up.
Tested w/key ON, eng NOT running.
My Wife said pushing the key in seemed to work once, altho it didn't work for me.



1) A/C

Seems to work more often in morns(when weather is cool), and not so much in the heat of the day when we need it. Sometimes I think it's teasing us!

When NOT working;

NO voltage to PCM (CRANK), CRUISE, A/C/CRUISE, A/C FAN, & STR COL fuses in driver's side fuse box.
"Clicking" somewhere on driver's side under the hood, stops after a minute or so.


When WORKING;

All driver's side fuses (EXCEPT STR COL) have voltage, & all A/C dash switches work.
No noticable "clicking" under hood.


I've checked/done;
Lite "smacking" on fuse box has no effect.
A/C fuse in pass side fuse box is good.
A/C fuse under the hood is good.
I've wiggled the wire loom under the hood in several places w/NO change.




2) Cruise Control;
Dash lite turns on/off whenever it feels like it.
Even w/lite ON, sometimes it still will not work.


THANK YOU for your help.

Mac

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Wednesday, June 5th, 2013 AT 9:31 AM

14 Replies

Tiny
DOCFIXIT
  • EXPERT
Suspect the ignition switch ie. Poor contacts. Try slightly wiggle key back and forth to see if stuff goes on and off
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Wednesday, June 5th, 2013 AT 10:31 AM
Tiny
MAC1233
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I've violently (when gently didn't work) wiggled, tugged, twisted, & tapped the switch, w/no results.
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Wednesday, June 5th, 2013 AT 10:38 AM
Tiny
MAC1233
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But I did NOT climb under the dash to wiggle the plug in.
I'll try that.
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Wednesday, June 5th, 2013 AT 10:42 AM
Tiny
DOCFIXIT
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All circuits you say have no power are feed by ignition switch
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Wednesday, June 5th, 2013 AT 10:46 AM
Tiny
MAC1233
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Thanks Doc, for your replies.

I couldn't get my hand up to the back of the switch, but I did try poking it w/a stick.
No change.

So, I guess it's internal, & I should change the key switch?

If so, how the heck do I get to it?

Is there a way to "jump" the switch before taking apart or working on the dash?
I have NO problems w/even alligator clips, for testing.

(I REALLY miss my '63 Galaxy, '65 Impala, & my '68 Dart GTS!)

Mac
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Wednesday, June 5th, 2013 AT 1:27 PM
Tiny
DOCFIXIT
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No switch burried need to pull colum apart remove key cylinder, air bag steering wheel and drill out switch screws. Ie. Big job
Yes "older cars" much easier
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Friday, June 7th, 2013 AT 8:29 AM
Tiny
MAC1233
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My switch is on the dashboard, not the column. Makes it a LOT easier on me.

Do you have a link to a free online electrical schematic I could use to figure out the wiring to the key plug in and driver side fuse box?
I've spent hours & hours tryin' to find one w/no result.

I'll temporarily "hard-wire" (w/an extra fuse of course) my A/C, while waiting for my new switch and cd factory repair manual. I live way out in the Mojave Desert, so theft isn't a problem, heat IS.
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Friday, June 7th, 2013 AT 9:30 AM
Tiny
DOCFIXIT
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Forgot chevy moved to dash get back to removing knee panl and got to key cylinder. Plug on bottom see diagram find ORANGE wire term C1 post F6 that is to AC find hot wire tap into.
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Friday, June 7th, 2013 AT 2:10 PM
Tiny
MAC1233
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Autozone wants near $100 JUST for the switch!

Now I'm thinkin' a PERMANENT jump wire following your instructions.

I'll run the batt volt input from switch's plug, to a fuse & toggle, & back to the switch's existing A/C wire.

Will that power up the PCM (CRANK), CRUISE, A/C/CRUISE, A/C FAN, & STR COL also, or are those all different wires requiring their own jumper?

If they're different wires, can you send a link to a color coded schematic?

Thanks.
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Friday, June 7th, 2013 AT 5:44 PM
Tiny
DOCFIXIT
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Working on getting schematic hope for today June 12
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Wednesday, June 12th, 2013 AT 9:08 AM
Tiny
MAC1233
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Hey Doc,

Saved my pennies & FINALLY bought the stock switch 'bout a week ago.
You were absolutely RIGHT-THANK YOU!
R&R was easier than I expected, due to your instructions.

AC & cruise problems went away.
Sun was shinin', crows flyin", snakes chasin' mice, ALL WAS WELL in the universe.

Drove to Phx to visit my Grandaughter, 'bout 450 miles w/no troubles, then my engine started "stumbling", dying at stops & sometimes even while driving 'round 30mph. Starts right back up. She (Impala) runs smooth when below operating temp. Also runs smooth (far as I can tell), at 65-70mph.

Could the starter switch have affected the evap system, similar to the AC & cruise? Should I tear apart my dash again to reinstall the old switch for testing?

Trouble codes PO102 (MAF or VAF A circuit low input) and PO443 (EVAP Emission Control system Purge Valve C fault).

Engine Devices fuse under hood is good.

MAF- w/key on, has volt & ground, checked w/test lite. I did have to replace the connector 'bout 6 months ago using wire nuts, (hands not steady 'nuff for soldering anymore).

Purge solenoid- w/key on, the purge solenoid connector has voltage (I can't find ANY scoop on how to check ground input coming from the ECM). While using jumpers from the battery to the purge solenoid, I can suck fumes (ARRGH!) Thru it. W/no volt applied, it is sealed.

Can you PLEASE HELP ME w/this new problem?

Mac
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Sunday, August 11th, 2013 AT 11:05 AM
Tiny
DOCFIXIT
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Glad to here ign switch solved problem. For new ones try this get a can of MAF cleaner clen off MAF also look for any air leaks in snorkle and condition of air filter. Then clear codes dive let me know if they reset.
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Monday, August 12th, 2013 AT 1:53 PM
Tiny
MAC1233
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Hey Doc,
Health reasons stopped me from replying sooner.
I did as you instructed and.
ALL IS WELL IN THE WORLD!

THANK YOU FOR YOUR EXPERTISE AND PATIENCE.

Mac
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Saturday, October 12th, 2013 AT 5:51 PM
Tiny
DOCFIXIT
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Hi Mac
Hope you are all well now. Glad things are fixed up cars can be frustrating but we need them
God Bless
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Sunday, October 13th, 2013 AT 11:00 AM

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