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2002 manual Protege5- Loud Squealing when Heater is on in Low Gears

climberchick81climberchick81 Posts: 1
edited October 2014 in Mazda
I just bought a 2002 Mazda Protege5 with 175k miles.

It squeals very loudly whenever I turn the heat on the car is in 1st, 2nd, or reverse. . . it does not squeal if I turn the heat on while the car is in a higher gear. If the squealing starts, it will only stop if I turn of the heat, and in about 10-20 seconds it subsides.

Does anyone know what could be causing the squealing and what I should possibly do about it?

Thanks!
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