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Old 08-12-2004, 08:10 AM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The heat from the side vents is a sign of a VACUUM leak. The heater valve is vacuum closed. Most common problem is the fresh air vacuum diaphram & the blend air diaphram. You need hand vacuum pump to check for leaks. The system need at least 10" of vacuum to operate. There is a vacuum storage tank under the right front fender near the battery, possibly the vacuum line there has been damaged by battery acid.
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