One problem related to air conditioner has been reported for the 2012 Ford Fiesta. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Ford Fiesta based on all problems reported for the 2012 Fiesta.
It happens intermittently but more frequently as time goes by. I will be at a stop light/sign and the rpm's will go as high as 3500; I turn on the air conditioner or heater and it comes down; and then stalls. It sputters and surges and then the power will all but go off and I get the warning: engine failure: see your dealer immediately. This has now happened at least 4 times. Twice, I have been on the highway and will totally be unable to go over 10 miles an hour; if I shut it off for 5 minutes when it comes back on it is usually ok. I read that Ford agreed to fix 1,600,000 cars that "limp home". I never received a notice on mine and I have read there were 59,807 warranty claims related to etb replacements. A so-called "customer satisfaction program extended the etb warranty coverage for up to 10 years. When I took my in they said it was not covered under warranty. It is dangerous to drive as the constant stalling in traffic etc.