Asked by Jun 29, 2016 at 06:03 PM about the 2005 Mercury Sable GS

Question type: Maintenance & Repair

Just had serviced due to no ac.
Problem was vacuum related. Now
stalls out at red lights when ac on.

1 Answer


Could be the ECM is not getting the signal that the A/C is on, but it would have to data scanned to find that out. The ISC could be stuck so it can't idle up when a load is sensed by the ECM. Something you can do yourself if your careful is clean the throttle body and remove and clean the ISC unit then put it back on, and then fire it up and let the idle stabilize then try the A/C.

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