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May be heating and cooling at the same time. Check to see if there is water circulating in the rear heater core and if so the vacuum operated water valve, vacuum line, or vacuum control may be bad. Check the valve first.

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โˆ™ 2006-07-06 21:56:23
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Q: If front AC works fine on a 1991 Ford Club Wagon but the rear AC only blows hot air what is wrong?
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