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Re: 96 chevy blazer not blowing out cold air only 70...
Have you checked the low side and high side pressures? The compressor might be bad. Does one line to the compressor get cold and the line coming out get hot?
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With the AC control is set to maximum coldness, you should be able to hear the familiar clicking sound of your AC clutch engaging. The clutch engages with a signal from the AC pressure switch, which reads the pressure level of the system. When the level drops too low, the pressure switch will not activate, and therefore the clutch will not engage. Without the AC clutch engaged, the system will not work and will not be able to circulate even the low amount of refrigerant it may have.
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what makes u say ur ac refrigerant has a blocked passage? check the low pressure line by touching it with ur hand while ac is running/ it has to be freezing cold/ if not cooling it means ur compressor is weak and or refrigerant is low/ high pressure line is normally hot/ check ac magnetic clutch operation must engage when ac switch is on and disengage when ac is turned off/ check ac condenser must be blocked and needs cleaning....
you need about two or three mor little cans of freon.If you dont have enough in the system the compressor clutch will not engage( turn ) of course you know this is the street version,not professional.but it will do.
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.
a system can have some freon in it and not be totally charged. You should consider either just attempting to add freon or take it somewhere to have it evacuated and put on a deep vacuum for 30 minutes or more and put a full charge on it.
it could be the air conditioning clutch going out. to check turn your car on and idle it with ac on and hood open. at the ac compressor it will have a pulley on it with a clutch that engages when the air conditioning is on. if it engages and disengages it can be the clutch itself has gone bad, the ac clutch will also disengage if there is not enough freon in the ac system, will also engage and disengage if the pressure gets too high in the ac system. Depending on the year of the vehicle it will disengage at full throttle and come back on when you are not at full throttle.
If it is a metallic sounding screech for example take a coke can and drag it across pavement kind of sound it could be a bad compressor or a bad ac clutch. If it is a more rubbery sound for example a car spinning its tires kind of noise it could be a loose belt.
1. Check to make sure all belts are tight under hood
2. start car and look at ac compressor to make sure compressor pulley is turning and that the fan clutch is engaged spinning
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