crowdkilla
Junior Member
Hi all, I'm having some issues with the A/C on my 2010 4.0l v6 mustang. I've only had the car for about a year and the A/C worked fine last summer but this summer it will randomly only blow hot air, then revert back to cold, then hot. Very intermittent. On hotter days, it won't blow cold air at all, then on days where it's only 75-85 degrees it will cycle between blowing warm or cool air.
Had a telltale knocking sound coming from the dashboard when I turn on the fan/ac, so I figured it could be an actuator issue. I replaced the heat temp blend actuator and it didn't solve the issue.
Scanned it and got code P0645, A/C Clutch Relay Control Circuit, and P0480, Fan 1 Control Circuit.
I swapped the relay for the A/C Compressor and it didn't seem to fix the issue either.
When looking at my A/C compressor in the engine, I can see it freezing up and shutting off, then randomly kicking on and spinning again a minute later. It seems to be short cycling, but just taking wayyyy longer to kick on in the hotter weather. When it short cycles like this, it also causes my engine's idle to drop down dangerously low to stalling.
Anyone have any experience with this? I don't have a pressure gauge to hook up to it. I did use an old cap from refrigerant to look at the pressure from the low side, and if anything it looks like my refrigerant is actually overcharged. No leaks, etc. Is it electrical?
Had a telltale knocking sound coming from the dashboard when I turn on the fan/ac, so I figured it could be an actuator issue. I replaced the heat temp blend actuator and it didn't solve the issue.
Scanned it and got code P0645, A/C Clutch Relay Control Circuit, and P0480, Fan 1 Control Circuit.
I swapped the relay for the A/C Compressor and it didn't seem to fix the issue either.
When looking at my A/C compressor in the engine, I can see it freezing up and shutting off, then randomly kicking on and spinning again a minute later. It seems to be short cycling, but just taking wayyyy longer to kick on in the hotter weather. When it short cycles like this, it also causes my engine's idle to drop down dangerously low to stalling.
Anyone have any experience with this? I don't have a pressure gauge to hook up to it. I did use an old cap from refrigerant to look at the pressure from the low side, and if anything it looks like my refrigerant is actually overcharged. No leaks, etc. Is it electrical?