When i am driving alond and either turn on the AC or the Defrost, the truck makes a strange noise and keeps doing it till i turn the AC/Defrost off. If i am accelorating when i turn them on the truck lags big time, i'd say at least half the power is gone.
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Re: I think the air compressor is bad in the truck
If your refrigerant level is OK and the truck blows cold air your compressor should be fine, in which case the noise is probably coming from the AC clutch which isn't too expensive or difficult to replace. If it doesn't blow cold air, switch the AC on and watch the compressor. If the clutch engages, but the compressor doesn't turn, the drive belt will squeal loudly and probably start to smoke. In that case it is the compressor which is expensive to replace. Most vehicles have an AC bypass that will temporarily cut out the compressor clutch under heavy load. If you are going uphill with the AC on or accelerating heavily you might notice warm air coming out of the vents for a short period until you let off the gas.
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Can you provide more details, type of vehicle, only acts up with a/c on, if you turn a/c off and turn the defrost on, sometimes the manufacturer will have the a/c compressor cycle, does the vehicle still act up?
you may have an a/c compressor clutch and or clutch bearing going bad. may be time for a new a/c compressor or compressor clutch assembly. the a/c comes on when you have the defrost or recirculation on in heater mode.
Ok..that is a strange one.. I am going to hazard a guess and suggest you look to the AC compressor.
When you run the defroster the ac compressor comes on..typically whenever the outside temp is above 40 degrees.. the ac compressor kicks in to dry out air inside.
Often when it rains.. the windows fog.. you turn on the defrost.. the ac compressor tries to come on.. and.. there ya go.. rather there your serpentine belt goes.
Several things could cause this.. worn belt.. failing belt tension-er... or failing ac compressor..
If the ac compressor is frozen meaing it will not turn..when the electric clutch on the front engages.. it would cause the pulley to stop turning.. and the belt would have a hard time staying on a non rotating part.
Or if the belt tension-er is bad..or the belt is worn.. when the additional load of the compressor kicks in.. it jumps off.
YOU SEEM TO HAVE A LOOSE OR BAD AC COMPRESSOR DRIVE BELT. WHEN YOU SWITCH THE TO THE VENTS CLOSE TO THE WINDSHIELD IT TURN THE AC COMPRESSOR CLUTCH ON, IT ACTIVATES THE DEFROST. TRY POURING SOME WATER ON THE AC BELT AND SEE IF NOISE GOES AWAY. THE BELT MAY NEED ADJUSTMENT OR MAY NEED TO BE REPLACED. GOOD LUCK
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