The A/C blows hot air instead of cold air, but the compressor and fans do not come on. I have had the fuses checked and they are o.k. Also, there is freon in the system. If it is an electrical problem, what can I check and how?
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Re: 2002 Saturn L200 A/C compressor is not engaging.
Yes their is a switch that senses the amount of gas pressure and shuts down system if their is not enough pressure,but playing with a high pressure system like this can seriously maim,so iam advising you to take it to a repair shop with a proper machine to discharge the system and then check for the faults ,but most likely cause is lack of reserve gas in the system and it just wants a re gas
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there is a fan on each side of the cooling module the fan will not come on if the freon is low that model had a problem with the pipe that goes into the compressor the bolt gets loose and also the pipe breaks
I would check the following possibilities: 1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.
2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.
Could be other issues, but I would start with these.
you either have a power loss problem but more likley your low on refrigerant. if its low, there is numerous pressure sensors that will not allow it to engauge to protect the compressor. you got to put a gauge on it. standing system at 80"F should have about 80-90 lbs. standing pressure.
If it happened all of a sudden, check the fan belt, and the A/C fuse. These are the most likely culprits. If the fuse is blown, the clutch on the A/C compressor may have gone bad, and should be looked at.
if the a/c compressor clutch is not engaging, you will never have any cold air. if the system has too much or too little freon in it, that will also mess it up. If system is undercharged, the compressor will short cycle, instead of staying on till the thermostat tells it to disengage. I suspect your problem is in the compressor and that is where i would look first.
not a fix, but i had someone run diagnostics on my 2001 saturn l200, and they said my coil & clutch are bad. the a/c still blows, just not not cold air. person who ran the diagnostics told me there is still freon in the system, but "could not tell if there was a leak" because the compressor wasn't doing its job because of the bad coil & clutch (?) was quoted $600 for fix $330 for the head part of the compressor, and the rest to labor. while shopping quotes, i was asked by another technician at another place, how air could still be blowing (at all) when the coil & clutch are supposedly bad. i have no idea, and it is adding to my frustration. i'd have taken it to my saturn dealer, but the one & only one around here SUCKS, so i'm trying to research on the internet so i'm not totally clueless as to what's really going on. best case scenario is it just needs coolant, worst case scenario, the $600 and a possible leak(s). good luck!