Hi everyone! I have a 2004 GT premium Mustang Convertible w 50,000....My car stalls ONLY when the A/C is on, I took it to ford and they told me I have a bad idle control module so I had them replace it, driving home from ford, my car stalled at a red light A/C was on and now my check engine light is on. Ford Told me I needed a throttle body flush, so I had Firestone do that for me. Driving home again My car stalls with the A/C on and check engine light came back on. So I took it back to Firestone and then they told me the codes on the check engine light were telling them that my Mass air flow sensor was bad, So I had them replace that! The next day A/C is on and my car stalls again and check engine light is back on...I have taken it back to ford and now that are telling me I have one bad spark plug???? I am not sure if I should let them fix this, not only am I broke but really really annoyed! Please someone HELP!!!
04 Mustang stall when ac is on..Help!
- Thread starter italianaqtpie
- Start date
Do you have the original battery? I had similar problem and it was the battery. I still had the original battery, 11 yrs old, but still worked. The problem I believe was that the battery always required charging and the iac compensates for that. when the ac is on it's too much strain on the system and it stalls out. I recommend the original motorcraft battery as the optima type battery is a high energy battery that doesn't last very long. Plus the motorcraft one is only $115 at Ford.
Your A/C compressor could be seizing up that's why it stalls with the A/C on. Remove the belt and turn the power on with the engine not running. Then turn the A/C on to engage the compressor clutch and try to spin the clutch/pulley assembly by hand. If it is extremely hard to turn you will need to replace the compressor
Could be silly question but do you have underdrive pulleys. From what I know changing your underdrive pulleys will cause you to pull back on the electricity used by the car in order to gain some of the lost hp. I've been told that having the ac or even just idling at a red light can cause the check engine light to turn on and the car to stall.