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2000 Chevrolet Blazer Question: My 2000 Chevy Blazer is blowing warm air out of A/C.

 

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Chevy2000, Potwin, KS, June 29, 2013, 09:15
 Rookie

We checks the leaks and here are none. Put in needed liquid refrigerant to run A/C. It is still blowing warm air. What is the next thing we can do? Thank you for your time and consideration

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  • Answer #1

    August 31, 2013, 08:13
     Technician

    MAN! SOUNDS LIKE A GUESSING GAME AT THE DEALER.
    SO HERE'S THE DEAL: OPEN THE HOOD, START THE ENGINE, AND TURN ON THE A/C. IF THE COMPRESSOR IS RUNNING AT ALL,

    **DO NOT ADD REFRIGERANT! OVERCHARGING THE SYSTEM MAY DESTROY THE COMPRESSOR!!

    RECOMMENDED REFRIGERANT PRESSURE IS ONLY A GUIDELINE BECAUSE PRESSURE IS DIRECTLY PROPORTIONAL TO TEMPERATURE (ONE DEGREE [F] IS EQUAL TO ONE P S I).-----RECOMMENDED PRESSURE' ON A 75 DEGREE DAY IS NOT THE SAME AS RECOMMENDED PRESSURE ON A 95 DEGREE DAY. ONE MORE IMPORTANT THING ABOUT REFRIGERANT CHARGING: IF YOU DO HAVE TO ADD A CAN TO THE SYSTEM, **DO NOT TURN THE CAN UPSIDE DOWN UNLESS YOU HAVE ENOUGH EXPERIENCE TO KNOW WHERE AND HOW! THE CHARGING TOOL CONNECTS TO THE TOP OF THE CAN. IF YOU COULD SEE INSIDE THE CAN, THE TOP OF IT WOULD BE VAPOR WHILE THE BOTTOM IT WOULD BE LIQUID. IN THE A/C SYSTEM, THE LOW SIDE, OR SUCTION SIDE, (LARGE TUBE) CARRIES REFRIGERANT AS VAPOR. VAPOR CAN BE COMPRESSED WITHOUT A PROBLEM. THE HIGH SIDE, , (SMALL TUBE) CARRIES IT AS LIQUID. **LIQUID DOES NOT COMPRESS. THE CHARGING PORT IS IN THE VAPOR LINE SO DON,T ADD LIQUID TO THE VAPOR SIDE BY TURNING THE CAN OVER.

    GO AROUND TO THE RH SIDE OF THE TRUCK NEAR THE FIREWALL AND LOCATE THE RECEIVER/DRIER (ACCUMULATOR) THIS IS A CYLINDRICAL TANK USED TO REMOVE MOISTURE DURING NORMAL OPERATION OF THE A/C. FIND THE LARGE REFRIGERANT TUBE COMING FROM THE REC/DRIER AND PLACE YOUR HAND ON THIS TUBE. IT SHOULD BE VERY COLD TO THE TOUCH. NOW LOCATE THE SMALL REFRIGERANT TUBE IN THE SAME VICINITY. EXERCISE CAUTION!! THIS TUBE SHOULD BE VERY HOT TO THE TOUCH SO PLACE YOUR HAND CLOSE BUT NOT ON THIS LINE. IF THE BIG TUBE IS COLD ENOUGH TO HAVE WATER CONDENSING ON THE SURFACE, AND THE SMALL TUBE IS TOO HOT TO TOUCH, THEN THE REFRIGERATION SYSTEM IS WORKING PROPERLY. IF THIS IS THE CASE AND YOU ARE GETTING WARM AIR FROM THE VENTS, IT MEANS YOUR CABIN TEMPERATURE BLEND DOOR IS NOT MOVING TO THE COLD POSITION. DID YOU SAY THAT THE DEALER REPLACED THE AIR BOX?

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