Your system is low on R134....the clicking is the compressor engaging and disengaging. You will get cool air while compressor is on, then warm when its off. They will act this way when R134 is low. Now either a leak in the system, or the system just needs a boost. Another thing to check is the condensor fan under the hood.When you turn the AC on,the condensor fan needs to be running, if its not then its a bad fan motor,relay, or fan sensor. I don;t know what your abilities are, but maybe armed with this info you can work on it yourself, or at least not get taken advantage of at the mechanics. Good luck !!
SOURCE: '98 S-10 heater blowing cold air - not hot air
will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks
SOURCE: heater control stuck blowinf hot air out vents
did you cheked if there is enough refrigrant ( freon ) in your tubes by measuring the pressure . if there is you may need to check your condensor its may be clogged and not letting enough air comes through to cool the refrigran
SOURCE: 2004 chevrolet suburban AC blows hot/cold at same time
You need to replace the drivers side temp actuator that is located on the left side of the HVAC box. It is retained by 3 screws and is fairly easy to replace.
SOURCE: I have a 2002 Chevy S10 4.3 V6 PU that a P0135
This is a o2 sensor code.
You might have 4 of those they are usually before and after each catilizer.
scanner should give you some other info like the code plus something like "bad heatther circuit sensor 1 bank 2" or "sensor 2 bank1"
this info tells you which side and which sensor is bad.
SOURCE: My 08 Impala heater blows hot air when moving and
try topping up the radiator.... there might not be enough antifreeze in the system when stopped and the water pump not pumping as much water... it could create an air pocket in the heater core and while stopped, and water in the core, or air even, will cool off until you start moving again
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