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the ac system needs air through the condenser ( radiator bit in front of the radiator) to operate correctly. IT it has no air then the compressed gas is to hot and will not turn to liquid and so the high pressure switch turns of the ac compressor. No problem when you are moving as road speed provides the air flow. Get an electric fan and have it installed before the condenser and connect it to the ac compressor circuit so that it is running all the time you have the ac compressor running. not the local mechanic.When dealing with ac systems the best people to take it to is an accredited ac specialist shop
If you still get cold air out of the rear vents but the front only blows hot air you may have a bad temp door actuator in the dash, it may be stuck on hot and not able to move to cold air. However if you are low on freon with a truck that has front and rear ac then there will be a temp diff between the two. If it is hot air out the front like the heat is on then you have that actuator problem but if it is cool air about the same as the outside air temp then you may be low on freon.
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.
possibl ac compressor clutch problem,cooling fan at rad not working so ac goes into high press mode and turns off(so it doesn,t blow system apart,built in safety)not enough r134 in system(low charge)
To fix the AC unit which blows hot air all the time. Seems like you have a small leak in the system or the AC compressor has gone out. Suggest you try recharging the unit. Make sure you have the correct R-22 or 134A freeon. If this work for a few days then have the leak fixed, if this doesn't work replace the compressor. Check Ebay for the compressor i obtained one for $100.00. Cost $450 at Auto Zone.
sound like ac vent or air door is not open.your ac mode switch is bad or the ac air door actutator is not getting vacuum .check vacuum lines to ac switch.besure disable air bags when working around steering area or dash.
it maybe you do not have enough oil in the compressor or the inline filter is pluging up try these websites car A/C repair www.directgardening.com and the other one is fix & troubleshoot heating & A/C www.automedia.com
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