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Old 03-30-2000, 09:43 PM
Benzmac Benzmac is offline
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
A vacuum leak can cause this...You may have a vacuum leak if the vents are not working properly. Don't overlook the mono-heat valve. It will cause the heat to kick in or not come on at all at random.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
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