Problem overview
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.
9 people reported this problem
1 commentPlymouth Acclaim vehicles with this problem
Average mileage: 62,500 miles
(30,000 - 95,000)
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