1999 jeep cherokee sport problem??

i have a 1999 Jeep Cherokee and every once in a while when i push on the gas, it squeals for for a time bit and when i let off the gas and consequently start back on and it stops. also i have notice when the heat/cold fan is off it never squeals. and when it is squealing and i turn the supporter off it stops in something like 2 seconds. what could it be? it is very annoying.

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Answers:    Serpentine belt . ( Fan Belt) It might be the AC compressor semi locking up a bit causing the belt to slip. Check the belt for cracks . That is assuming the squeak noise you are audible range is coming from the engine compartment .If the noise is coming from inside it's most likely blower motor enthusiast bushings

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