[car-diac]

To anyone who can help:
I own a 1993 Ford Mustang 2.3L LX. I am trying to locate the existing A/C Relay for replacement. If anyone knows where this thing is, I'd be much obliged if you'd help.

About a week ago, literally over night, my Mustang stalled out when I started it. This happened two more times, and the only thing that kept it from happening a third time was putting it in reverse. I was able to drive the car that day, however it ran very rough and below the usual RPMs both in drive and in idle. This is when I would get a Check Engine Light and the car would stall shortly Afterward.

Whenever I come to a stop, even after a drive, the car has a severe shudder coming from the engine compartment. The A/C is now also only blowing through the defroster vent. I tried to manually idle the car up a bit, and that worked, but when I turned the A/C on again the RPMs and idle cut in half. At that point, no matter how I idled it, the RPMs and idle did not change.

Now, when I turn the key in the ignition, there is an automatic boost in the RPMs, but then it immediately stalls out. If I give it some gas for about 30 seconds, the car will run very rough for about a minute and then stall out.

I have changed the fuel filter and I've checked the idle sensor on the throttle body. I was told it may be the A/C Relay, but I cannot locate it within the car. If someone knows where it is, or can tell me wheter or not I'm going in the right direction, please let me know!!

_car-diac

[C J]

the A/C relay is in the CCRM (Constant Control Relay Module) under hood by the passenger strut tower.

the a/c blowing through the defrost vents only, shows a vacuum leak. normally in engine compartment along firewall.

what code did you get for the check engine light??

[car-diac]

The code I got from the check engine light was either 111 (all systems functioning properly) or a 12 (system cannot maintain idle speed). It was extremely hard to tell. I ran the test as directed several times. I've been operating under the assumption that it read a 12 because of the problems I've been having. It is an older Mustang, so the diagnostic tool only works in a system of beeps and flashes.

I will search under the hood for the A/C relay. Thanks for the tip.

[C J]

code 12 is - can't control rpm in KOER self test high idle.

clean IAC. clear codes and rerun selftest. are codes present??