2006 Expedition won’t remote start after pressing the unlock button
 

Hi,

I own a 2006 Ford Expedition xlt. The remote starter is an avital 477L, which worked just fine until last week. I disconnected the battery because I had to replace the ac compressor myself, as I have been to 3 shops and nobody could find a compatible compressor, and the last one charged me 1200$ for the job. After replacing the compressor and the belt, the car started acting funny.
First thing was that it won’t remote start, I read each and every manual about the avital, nobody encountered this specific problem. After unlocking the car, it won’t remote start, but after I turn the keyfob to acc on, then remove the key, it’ll start just fine until next time i lock/unlock after leaving it for a
few hours. There is no valet mode indicator on the remote, and I tried reprogramming it with the reprogramming button located under the steering wheel, that also didn’t work. I also located the kill switch and flipped it to the moon and back, still nothing. I went to some shop and they were charging 100$ diagnose, plus extra for labor and fixing the thing. A new remote starter with install is 300$ at best-buy.
The other thing is that the engine randomly stalls, when the ac is set to max. The belt seems to be ok, everything in place and tight enough, nothing is sagging. A friend of mine suggested that I should replace the fuel filter(the car was bought from an auction site, ex police vehicle) because that might be the culprit, and my mom didn’t bother to change it, she just did an oil change. I don’t think it’s the fuel filter, because it acted fine prior to replacing the compressor, just that I didn’t have ac. The new compressor has a smaller footprint, the rotating part, and that’s why I bought a new belt, to compensate the smaller footprint. Again, everything seems a tight fit. Battery is a year old, didn’t have that checked but I don’t think it should be the problem.

Please help, if anyone has any suggestions, it’s annoying that I cannot remote start because when I usually leave home there are around 105 degrees. Also, last night I almost ran a pole down because the car just stalled while I was making a left in the intersection and couldn’t steer. I tried remote starting with and without the ac on, same issue. If I run the ac on normal, everything seems to be fine with the stalling thing, but still won’t remote start.