Car Problem Reports

Plymouth Acclaim HVAC air flow switching to defrost under heavy engine load

 
Plymouth Acclaim Problem
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Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995

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The heating, ventilation and AC (HVAC) system may  change to defrost mode under heavy engine load conditions when low engine vacuum is produced. This can often be corrected by installing an additional vacuum check valve with reservoir to help stabilize the vacuum supply to the HVAC system.