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Re: Air conditioner light inside truck comes on but blows...
It isn't blowing AC at all, just air. See if your compressor is turning with the belts when the system is engaged. Not just the pully but the compressor.
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The likely cause is a bad compressor clutch, but there are other possible causes. The first thing to do is to observe the compressor with the engine running. The clutch is inside the pulley. When the a/c is off, the pulley turns on thr belt, but the clutch does not turn. When the a/c is turned on, the clutch should lock on the pulley and turn with it. Run this test and post the result here.
On most cars when you push a button or slide a lever to change your choice of location where you want the air to blow out louvers move inside the dash to redirect the air to your chosen location. When you switch from heat to AC other louvers move. These louvers are often powered by vacuum lines running from the engine. If one of these louvers is stuck or if you have a vacuum leak in one of the lines it may be causing your problem.
CHECK YOUR CONDENSER IT MIGHT NOT BE GROUNDED. MINE DID THE SAME THING IT WOULD COME ON AND THE CONDENSER WOULD RUN FOR A FEW MIN. THEN KICK OFF AND NOT COME BACK ON MAKING IT BLOW COOL AND NOT COLD
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